A reclamation system and method for land reclamation based on high-water-content materials-mud composites

Abstract

This invention belongs to the field of land reclamation technology, specifically relating to a land reclamation system and method based on a high-water-content material-slurry composite. The system includes an integrated movable platform, a sand extraction system, a water supply system, a slurry preparation system, a slurry mixing system, a slurry delivery pipeline system, and a dredging operation system. The integrated movable platform has a sand extraction system and a water supply system at one end, a slurry mixing system at the other end, and a slurry preparation system in the middle. The water supply system is connected to the input end of the slurry preparation system, and the output end of the slurry mixing system is connected to the dredging operation system. All dredging operations are conducted via pipelines, resulting in a simple and convenient construction process. In this invention, the hardened high-water-content material only requires a few days of curing to achieve a strength far exceeding that of ordinary soft soil. Therefore, the land reclamation operation cycle is significantly reduced, solving the problems of low efficiency and high construction costs associated with existing dredging and reclamation foundation treatment technologies.

Description

Technical Field

[0001] This invention belongs to the field of land reclamation technology, specifically relating to a land reclamation system and method based on a high-water-content material-mud composite. Background Technology

[0002] With the development of economic construction, land resources are becoming increasingly scarce, and human demand for the use of marine space is constantly increasing, leading to a rise in land reclamation projects.

[0003] Land reclamation projects generally employ two methods: dry filling and hydraulic filling. Dry filling involves excavation; hydraulic filling refers to dredging with dredgers, then discharging the mud-sand-water mixture from the dredging tank through pipelines to nearshore or riverside depressions, filling the depressions with silt and removing the water, thus raising the depressions to a certain height and making them usable.

[0004] Hydraulic fill soil often has the characteristics of "three highs and one low," namely, high natural water content, large void ratio, high compressibility, low shear strength, and low permeability coefficient, and is generally in a soft plastic to fluid plastic state. Therefore, foundation treatment is often required for hydraulic fill soil to meet the needs of subsequent construction.

[0005] Commonly used methods for treating hydraulically filled soil foundations include vacuum preloading, dynamic compaction, and cement splitting grouting. However, due to the "three highs and one low" characteristics of hydraulically filled soil, its consolidation time is very long, thus the above-mentioned foundation treatment methods all face problems of long construction periods and high construction costs. In addition, there are also difficulties in transporting construction machinery and materials, all of which lead to low efficiency in the treatment of hydraulically filled soil foundations.

[0006] In recent years, chemical reinforcement methods have emerged internationally for treating dredged fill, which involves adding solidifying materials to the dredged mud to solidify it and give it good engineering properties. However, the drawbacks of this method are the large amount of solidifying materials used, high construction costs, and the potential for solidifying materials to pollute groundwater.

[0007] Furthermore, both traditional foundation treatment methods and chemical reinforcement methods require sufficient soil to be dredged and filled before the filled soil is treated to improve its strength. However, many land reclamation projects face the problem of a lack of soil from the nearby seabed and difficulties in transporting it away, a problem that has long hindered the development of land reclamation projects.

[0008] There is an urgent need for a land reclamation construction technology that requires less soil, has a faster construction period, is more convenient to construct, and has lower costs. Summary of the Invention

[0009] The technical problem to be solved by the present invention is that the existing land reclamation construction technology uses a large amount of soil, has a long construction period, is inconvenient to construct, and is costly. In order to solve the above problems, the present invention provides a land reclamation system and method based on high water content material-mud composite, and in particular a system and method for completing land reclamation projects by using high water content material-mud composite for hydraulic filling.

[0010] The objective of this invention is achieved in the following manner: a land reclamation system based on a high-water-content material-slurry composite, comprising an integrated mobile platform, a sand extraction system, a water supply system, a slurry preparation system, a slurry delivery pipeline system, a slurry mixing system, and a reclamation operation system. The sand extraction system extracts sand from the bottom of a designated water area or sea area and then transports the mud through pipelines to an integrated mobile platform. After processing, the mud is stored in a mud storage device for later use. The other end of the mud storage device is connected to the slurry delivery pipeline system via pipeline. The water supply system extracts water from the designated water area or sea area and supplies water to the entire reclamation system. The water purifier and water storage device of the water supply system are placed on the integrated mobile platform. The water storage device is connected to the slurry preparation system via pipeline to supply water to it. The slurry preparation system is placed on the integrated mobile platform. One end of the slurry preparation system is connected to the water supply system via pipeline, and the other end of the slurry preparation system is connected to one end of the slurry delivery pipeline system via pipeline. The other end of the slurry delivery pipeline system is connected to one end of the slurry mixing system via pipeline. The other end of the slurry mixing system is connected to the reclamation operation system via pipeline. The reclamation operation system performs reclamation operations to complete the land reclamation.

[0011] The integrated mobile platform refers to a mobile, integrated platform used to install and fix the instruments and equipment of the slurry preparation system, water supply system, and sand extraction system of the entire reclamation system. This platform is divided into several zones, and a streamlined process is designed according to the technological flow sequence. The relevant instruments and equipment are then arranged linearly according to the sequence of procedures. Furthermore, for ease of construction, the integrated platform must be mobile, preferably using transport vehicles or vessels to quickly move the integrated platform to any location.

[0012] Preferably, the slurry preparation system should be installed on an integrated movable platform; the water purifier and water storage device of the water supply system should be installed on an integrated movable platform; and the mud treatment device and mud storage device of the sand extraction system should be installed on an integrated movable platform.

[0013] Preferably, when the integrated movable platform is close to the reclamation site, the slurry delivery pipeline system and the slurry mixing system can be installed on the integrated movable platform. When the integrated movable platform is far from the reclamation site, the pipeline length of the slurry delivery pipeline system is very long. In this case, the slurry mixing system cannot be installed on the integrated movable platform; instead, it should be installed near the reclamation site. The delivery pump and flow controller of the slurry delivery pipeline system near the slurry preparation system can be installed on the integrated movable platform, but the booster pump added in the middle of the delivery pipeline cannot be installed on the integrated movable platform. It should be noted that the pipeline length of the slurry delivery pipeline system mainly depends on the distance between the integrated movable platform and the reclamation site.

[0014] The sand extraction system refers to a system that extracts sand from a predetermined water area or sea area, then transports the slurry to an integrated mobile platform, and processes the slurry. The sand extraction system includes a dredger, a mud pump, a mud pipeline, a booster pump, a slurry treatment device, and a slurry storage device. The mud pump is mounted on the dredger, with one end connected to the dredger and the other end connected to the mud pipeline to pressurize the slurry dredged by the dredger to the slurry treatment device. A booster pump is installed in the middle of the mud pipeline to increase the hydraulic pressure inside the pipeline when it is too long and insufficient. The other end of the mud pipeline is connected to the slurry treatment device, which is connected to the slurry storage device via a pipeline.

[0015] The dredger mentioned refers to a vessel used for dredging mud from the bottom of water. Common dredgers include trailing suction hopper dredgers, cutter suction dredgers, grab bucket dredgers, shovel bucket dredgers, and chain bucket dredgers. Different dredgers are suitable for different working conditions. In this invention, the type of dredger needs to be selected according to the actual working conditions.

[0016] Preferably, the sand dredging area should be determined first based on geological, hydrological, and economic indicators, and then the sand dredging area should be divided into zones and layers. The allocation of vessels and dredging depths should be reasonable to ensure that the efficiency of the dredgers in the zoned and layered operations is maximized and optimized, avoiding sand dredging operations exceeding or approaching their maximum operating depth and causing wear and tear on the dredgers.

[0017] The mud pump is a pump used to pressurize and transport the mud dredged by dredgers to the mud transport pipeline. The selection and power of the mud pump need to be determined based on pipeline parameters, mud concentration, and flow rate.

[0018] The sludge transport pipeline refers to the pipeline used to transport the sludge dredged by the dredger. The selection of the sludge transport pipeline needs to be determined based on the characteristics, concentration, and flow rate of the sludge.

[0019] Preferably, the length of the sludge conveying pipeline should not exceed 1.5 km to avoid material wear and head loss caused by the normal pipeline length, which would affect production efficiency.

[0020] Preferably, the layout of mud conveying pipelines should adhere to the principles of short pipelines, straight installation, minimal climbing, few bends, and minimal floating and submerged pipes, in order to reduce flow velocity loss and pipeline wear.

[0021] The pressurization pump is used to pressurize the mud dredged by the dredger so that it can be smoothly transported through the mud conveying pipeline to the subsequent process.

[0022] The selection and location of the preferred booster pump should be determined based on the delivery pipeline, delivery flow rate, and mud concentration.

[0023] The mud treatment device refers to a device that processes mud to meet the requirements for subsequent use by adjusting the sand content, mud-sand material characteristics, and sand particle size distribution. The mud treatment device includes a filter screen, a hydrocyclone, a solid-liquid mixing device, a mud mixing tank, a mud pump, a liquid inlet and outlet device, as well as auxiliary equipment such as a motor and a stirring device.

[0024] A filter screen is a filtration device used to filter sand particles from mud transported through pipelines to control the particle size distribution in the mud. A filter screen consists of several meshes with varying aperture sizes; the combination of these meshes controls the particle size distribution in the mud. The mesh aperture combination needs to be determined based on the required mud-sand particle size distribution according to the foundation strength requirements of the reclamation project, and then the mesh aperture combination is determined accordingly. The relationship between foundation soil particle size distribution and strength can be referenced from relevant design theories in soil mechanics.

[0025] A hydrocyclone is a device used to separate mud and sand particles and water filtered by a filter screen into slurries of different particle sizes, thereby controlling the sand content of the slurry. A hydrocyclone can separate slurries of a predetermined particle size, and the separated clarified liquid is discharged through an overflow device. Hydrocyclones can be combined with multiple particle size combinations to obtain slurry separations of different particle size combinations. The clarified liquid separated by the hydrocyclone overflow device can be recycled. Hydrocyclones can be selected and designed based on existing technology.

[0026] Preferably, in this invention, it is not necessary to perform complete solid-liquid separation of the mud. It is only necessary to perform simple separation of mud with different particle sizes. By remixing mud with different particle sizes, a mud with a predetermined sand content, predetermined particle size distribution, and uniform and stable material can be prepared.

[0027] The solid-liquid mixing device is used to remix the mud of different particle sizes separated by the hydrocyclone in order to prepare a mud with a predetermined sand content, predetermined particle size distribution, and uniform and stable material.

[0028] The mud mixing tank is used to temporarily store the mud liquid obtained by the solid-liquid mixing device and to further mix the mud liquid. The slurry storage tank is equipped with liquid inlet and outlet devices and slurry pump devices for inlet and outlet of slurry, and is equipped with a stirring device to ensure that the mud is fully mixed and the solid particles are suspended.

[0029] Preferably, to ensure the uniformity and stable performance of the dredged material, the sand content, physical and mechanical properties, and particle size distribution of the sand particles in the slurry must remain stable and uniform. Therefore, this invention requires that the slurry used for dredging must have a uniform concentration and uniform particle size distribution after treatment by the slurry treatment device. The slurry concentration and particle size distribution need to be designed according to the requirements of subsequent dredging operations.

[0030] Preferably, the mud treatment device needs to be equipped with corresponding testing instruments and equipment to monitor the physical characteristic parameters of the mud in real time (such as sand content, particle size distribution, and density in the mud). The required testing instruments and equipment are all conventional technologies in the field.

[0031] Preferably, the mud treatment device can be designed and combined based on existing technologies.

[0032] The working principle of the mud treatment device is as follows: the particle size distribution in the mud is controlled by a filter screen composed of several coarse and fine mesh screens; then, the mud with different particle size combinations is separated into solid and liquid by a hydrocyclone; then, the solid and liquid phases separated by the hydrocyclone are remixed by a solid-liquid mixing device to prepare a mud with a predetermined sand content, predetermined particle size distribution, and uniform and stable material. The mud obtained by the solid-liquid mixing device is then temporarily stored in a mud mixing tank and further mixed by a stirring device to obtain a mud with a predetermined sand content, predetermined particle size distribution, and uniform and stable material.

[0033] The mud storage device refers to a device used for storing mud processed by the mud treatment device. One end of the mud storage device is connected to the mud mixing tank of the mud treatment device via a pipeline, and the other end is connected to the slurry conveying pipeline system via a pipeline. Preferably, this device is equipped with a stirring device to ensure the mud is in a uniform state and to prevent sedimentation and segregation. The mud storage device can be designed and combined according to existing technology.

[0034] Preferably, the mud storage device needs to be equipped with corresponding testing instruments and equipment to monitor the physical characteristic parameters of the mud (such as sand content, particle size distribution, and density) and real-time capacity parameters in real time. The required testing instruments and equipment are all conventional technologies in the field.

[0035] Preferably, the mud storage device is provided with an inlet channel and an outlet channel, and a flow control device is provided on the inlet channel and the outlet channel to control the inflow and outflow of mud in the mud storage device. The inlet channel, the outlet channel and the corresponding flow control device are all conventional technologies in the art.

[0036] The water supply system mainly provides the water required for the entire reclamation system, including a water pump, water supply pipe, water purifier, and water storage device. The water pump is placed in the water source body at the water intake point. The water outlet of the water pump is connected to the water purifier through the water supply pipe. The water outlet of the water purifier is connected to the water storage device. The water outlet of the water storage device is connected to the slurry preparation system through the outlet pipe.

[0037] The water source for the water supply system refers to a nearby natural water body at the site of the reclamation project. The water intake point should be selected from seawater in an unpolluted area, taking into account the location of the reclamation site and the integrated mobile platform. Preferably, the sand extraction area, water intake point, and reclamation area should be rationally divided before the reclamation project begins.

[0038] Preferably, the water source used in this invention can be either fresh water or seawater. Since land reclamation projects are often located in marine environments and lack fresh water, the water source should be as readily available as possible. Experimental research has shown that the water required for the hydration and hardening reaction of the high-water material provided in this invention can be seawater. Furthermore, comparative experiments have demonstrated that high-water materials prepared and cured using seawater can achieve similar mechanical properties to those prepared and cured with freshwater and meet the mechanical property requirements for land reclamation. Therefore, the water source required in this invention can be either fresh water or seawater; for ease of construction, seawater is preferred.

[0039] The water pump is used to draw water from the water intake point and pump it into the water supply system. It is important to note that a filter device must be installed at the water pump inlet to prevent large debris (such as wood blocks, dead fish, and floating garbage) from entering the pump and affecting its operation. Preferably, the selection of the water pump should be determined based on the construction speed of the reclamation project and the water consumption of the reclamation system, and the pump's efficiency must meet the water supply requirements of the reclamation system.

[0040] The water purifier refers to a device that filters, settles, and removes impurities from water pumped by a water pump to obtain purified water that meets the water quality requirements for the production of high-quality materials.

[0041] The water storage device refers to a device for storing purified water obtained from the water purification system. Since the preferred water source for this invention is seawater, the water storage device must meet corrosion resistance requirements. The capacity of the water storage device needs to be determined based on the requirements of subsequent reclamation projects.

[0042] The water supply pipe is a conduit used to transport water. Preferably, the water supply pipe is a flexible pipe resistant to seawater corrosion.

[0043] Research indicates that high-water-content materials can be processed and cured using seawater, and still exhibit good mechanical properties in seawater; however, the performance of high-water-content materials is affected by water quality. Therefore, for seawater with different qualities, the performance of corresponding high-water-content materials needs to be calculated and analyzed. Based on actual engineering needs, a reasonable water-cement ratio should be determined, and the required water volume should be calculated from this ratio. Then, based on the required water volume, the model and efficiency of the water pump, the number and efficiency of the water purification device, the volume of the water storage device, and the diameter and material of the water pipes should be determined.

[0044] The slurry preparation system is mainly used to prepare two types of slurries, A and B, for high-water materials.

[0045] High-water-content material is a novel cementitious material. It is made by mixing four solid powders (A, AA, B, and BB) with water to form four slurries (A, AA, B, and BB). Slurries A and AA are then mixed to form slurry A, and slurries B and BB are mixed to form slurry B. Slurries A and B do not solidify or form a base after standing for more than 24 hours, making them suitable for mechanized pumping construction. When slurries A and B are mixed, they quickly solidify into a high-water-content material aggregate. High-water-content material has the advantages of high water content (87%~90%, water-cement ratio of 2.2:1~2.57:1, while ultra-high-water-content materials developed based on this have a water volume greater than 95% and a water-cement ratio of up to 11:1), high early strength (aggregate strength of 0.5~1MPa in 1 hour, 2MPa in 2 hours, and over 5MPa in 7 days), pumpability, and the ability to recrystallize and recover strength after early aggregate failure.

[0046] Among them, component A is made from bauxite and gypsum, and component AA is mainly a composite super-retarding dispersant; component B is made from gypsum and lime, and component BB is mainly a composite quick-setting agent.

[0047] Preferably, in this invention, the mass ratio of the main ingredients of the high-water-content material is A:AA:B:BB = 1:0.1:1:0.04. The water-cement ratio of the high-water-content material varies depending on the amount of water added. Common water-cement ratios range from 2:1 to 11:1 for ultra-high-water-content materials, corresponding to compressive strengths between 6 MPa and 0.5 MPa. Changes in the water-cement ratio affect the hydration and hardening reaction process of the high-water-content material, and further influence the water content, bulk density, microstructure development, and macroscopic mechanical properties of the high-water-content material stone. The hydration and hardening product of the high-water-content material is ettringite (chemical formula: 3CaO·Al2O3·3CaSO4·32H2O), which accounts for more than 90% of the solid mass of the stone.

[0048] Specifically, the slurry preparation system consists of two systems, A and B. The equipment in systems A and B is identical. Each production line comprises a silo, weighing device, conveying device, mixing device, liquid storage device, mixing device, and slurry storage device. It is supplemented by a weight controller to control the weighing weight of solid materials, various flow controllers to control the flow rates of water, slurry, and slurry, and a delivery pump to provide pumping pressure. The silo, weighing device, conveying device, liquid storage device, mixing device, and slurry storage device are connected by pipelines. The silo is connected to one end of the weighing device via a pipeline; the other end of the weighing device is connected to one end of the conveying device via a pipeline; the other end of the conveying device is connected to one end of the liquid storage device via a pipeline; the other end of the liquid storage device is connected to one end of the mixing device via a pipeline; the other end of the mixing device is connected to one end of the slurry storage device via a pipeline; and the other end of the slurry storage device is connected to the slurry conveying system via a pipeline. Both the liquid storage device and the slurry storage device have built-in mixing devices.

[0049] The silos are mainly used to store four materials: A, B, AA, and BB.

[0050] The weighing device refers to a device for weighing the four materials (A, B, AA, and BB) and the required water for preparing the high-water-content material. Preferably, the water required for preparing the high-water-content material can be seawater, supplied by a water supply device. The water volume can be controlled by weight or by flow rate. The water required for preparing the four slurries (A, B, AA, and BB) needs to be weighed separately and transported through pipelines.

[0051] The conveying device refers to the device that transports the material weighed by the weighing device to the subsequent process. A screw conveyor is preferred.

[0052] The stirring device refers to a stirrer that mixes and stirs four materials, A, B, AA, and BB, with water to prepare four slurries, namely A, B, AA, and BB.

[0053] The liquid storage device refers to a device for storing four types of slurry: A, B, AA, and BB.

[0054] The mixing device refers to the device that mixes slurry A and slurry AA to prepare slurry A, and mixes slurry B and slurry BB to prepare slurry B.

[0055] The slurry storage device refers to a device that stores slurry A and slurry B separately.

[0056] The production process of the A and B pulping systems is as follows: First, the two main materials A and B, as well as the two auxiliary materials AA and BB (also known as additives), required for preparing high-water materials are weighed from the silo using a weighing device. Then, the corresponding amount of purified water is weighed from the water storage device using a weighing device. Next, the main materials and auxiliary materials are mixed with water using a stirring device to produce four types of slurries: A, B, AA, and BB. The four types of slurries A, B, AA, and BB are stored in storage devices A, B, AA, and BB, respectively. Then, the two types of slurries A and AA are mixed using a mixing device to obtain slurry A. The two types of slurries B and BB are mixed using a mixing device to obtain slurry B. Finally, slurries A and B are stored in storage devices A and B, respectively, for later use.

[0057] Specifically, the A-material slurry preparation system includes an A-material silo, an AA-material silo, an A-material weighing device, an AA-material weighing device, an A-material conveying device, an AA-material conveying device, an A-material water inlet flow controller, an AA-material water inlet flow controller, an A-material mixing device, an AA-material mixing device, an A-material slurry storage tank, an AA-material slurry storage tank, an A-material slurry flow controller, an AA-material slurry flow controller, an A-material slurry storage tank, and an A-material slurry mixing device. The system includes: an A-material inlet flow controller, located at the pipe interface between the water supply system's storage device and the A-slurry storage device to control the inlet flow of the A-slurry storage device; an AA-material inlet flow controller, located at the pipe interface between the water supply system's storage device and the AA-slurry storage device to control the inlet flow of the AA-slurry storage device; an A-material flow controller, located at the pipe interface between the A-slurry storage device and the A-material slurry storage device to control the inlet flow of the A-slurry entering the A-material slurry storage device; an AA-material flow controller, located at the pipe interface between the AA-material slurry storage device and the A-material slurry storage device to control the inlet flow of the AA-material slurry entering the A-material slurry storage device; an A-material mixing device and an AA-material mixing device, respectively located inside the A-slurry storage device and the AA-material slurry storage device; and an A-material slurry mixing device located inside the A-material slurry storage device.

[0058] The production process of the A-material slurry preparation system is as follows: The A-material silo weighs a sufficient amount of A-material using an A-material weighing device, and then transports the weighed A-material through a pipeline to the A-slurry storage tank via an A-material conveying device. This A-material is then mixed with water in the water supply system's storage device. The water volume is controlled by the A-material inlet flow controller. Finally, in the A-slurry storage tank, the A-material and water are stirred and mixed under the action of an A-material stirring device to produce A-slurry. The AA-material silo weighs a sufficient amount of AA-material using an AA-material weighing device, and then transports the weighed AA-material through an AA-material conveying device... Water is transported through pipelines to the AA slurry storage tank and mixed with water in the water supply system storage device. The water volume is controlled by the AA material inlet flow controller. Then, in the AA slurry storage tank, the AA material and water are stirred and mixed under the action of the AA material stirring device to produce AA slurry. Under the control of the A slurry flow controller and the AA slurry flow controller, the A slurry in the A slurry storage tank and the AA slurry in the AA slurry storage tank are transported through pipelines to the A material slurry storage tank, and stirred and mixed under the action of the A material slurry stirring device to produce A material slurry.

[0059] The B-material slurry preparation system includes a B-material silo, a BB-material silo, a B-material weighing device, a BB-material weighing device, a B-material conveying device, a BB-material conveying device, a B-material inlet water flow controller, a BB-material inlet water flow controller, a B-material mixing device, a BB-material mixing device, a B-material slurry storage tank, a BB-material slurry storage tank, a B-material slurry flow controller, a BB-material slurry flow controller, a B-material slurry storage tank, and a B-material slurry mixing device. The B-material inlet flow controller is installed at the pipe interface between the water supply system storage device and the B slurry storage device to control the inlet flow of the B slurry storage device. The BB-material inlet flow controller is installed at the pipe interface between the water supply system storage device and the BB slurry storage device to control the inlet flow of the BB slurry storage device. The B slurry flow controller is installed at the pipe interface between the B slurry storage device and the B-material slurry storage device to control the B slurry flow entering the B-material slurry storage device. The BB slurry flow controller is installed at the pipe interface between the BB slurry storage device and the B-material slurry storage device to control the BB slurry flow entering the B-material slurry storage device. The B-material mixing device and the BB-material mixing device are respectively installed inside the B slurry storage device and the BB slurry storage device. The B-material slurry mixing device is installed inside the B-material slurry storage device.

[0060] The production process of the B-material slurry preparation system is as follows: The B-material silo weighs a sufficient amount of B-material using a B-material weighing device, and then transports the weighed B-material through a pipeline to the B-slurry storage tank via a B-material conveying device. This B-material is then mixed with water in the water supply system's storage device. The water volume is controlled by a B-material inlet flow controller. Finally, in the B-slurry storage tank, the B-material and water are stirred and mixed under the action of a B-material stirring device to produce B-slurry. The BB-material silo weighs a sufficient amount of BB-material using a BB-material weighing device, and then transports the weighed BB-material through a BB-material conveying device... Water is transported through pipelines to the BB slurry storage tank and mixed with water in the water supply system storage device. The water volume is controlled by the BB material inlet flow controller. Then, in the BB slurry storage tank, the BB material and water are stirred and mixed under the action of the BB material agitator to produce BB slurry. Under the control of the B slurry flow controller and the BB slurry flow controller, the two slurries, B slurry in the B slurry storage tank and BB slurry in the BB slurry storage tank, are transported through pipelines to the B material slurry storage tank and stirred and mixed under the action of the B material slurry agitator to produce B material slurry.

[0061] The slurry conveying pipeline system includes pipelines and pressurizing devices for conveying slurry A and slurry B from slurry storage device A and slurry storage device B to the mixer, respectively, and pipelines and pressurizing devices for conveying mud from mud storage device to the mixer; specifically, it includes slurry A conveying pipe, slurry A conveying pump, slurry A flow controller, slurry B conveying pipe, slurry B conveying pump, slurry B flow controller, mud conveying pipe, mud conveying pump, mud flow controller, and a pressurizing pump may be added as needed.

[0062] The system comprises the following components: Slurry A storage outlet connected to Slurry A delivery pump; Slurry A delivery pump output connected to slurry mixing system; Slurry A flow controller installed on the pipeline between Slurry A delivery pump and slurry mixing system; Slurry B storage outlet connected to Slurry A delivery pump; Slurry B delivery pump output connected to slurry mixing system; Slurry B flow controller installed on the pipeline between Slurry B delivery pump and slurry mixing system; Slurry mixing system input connected to mud delivery pump; Slurry flow controller installed on the pipeline near the slurry mixing system end of mud delivery pump; and Slurry pressurization installed on the pipeline between mud delivery pump and slurry mixing system to facilitate smooth transport of mud through the mud conveying pipeline to the subsequent process pressurization pump.

[0063] Preferably, the slurry conveying speed should be no less than 1.8-2.0 m / s to prevent slurry sedimentation; correspondingly, the inner diameter of the conveying pipeline should not be less than 100 mm; the pipeline should have good compressive strength (strength should not be less than 8 MPa), and seamless steel pipe is preferred as the material. Furthermore, to increase the hydraulic pressure of the slurry so that it can smoothly pass through the mixing system and be conveyed to the working face, a booster pump needs to be added to the slurry conveying pipeline to increase the output hydraulic pressure of the slurry.

[0064] Preferably, since slurries A and B can be stored separately without solidifying or forming a base for 24 hours, but will solidify rapidly after being mixed, with an initial setting time of approximately 30 minutes, when the integrated mobile platform is far from the reclamation site, the slurry mixing system needs to be located near the reclamation site. In this case, the slurry delivery pipeline system transports slurries A and B, along with mud, from the integrated mobile platform to the slurry mixing system near the reclamation site. Since the pipeline length is relatively long in this situation, a booster pump is required to provide the necessary pumping pressure.

[0065] Those skilled in the art will readily understand that the criteria for determining the distance between the integrated movable platform and the reclamation face are not limited to absolute distance length, but should also depend on the initial setting time of the high-water material in the slurry mixing system. When the slurry mixing system is set on the integrated movable platform, and adjusting the flow rate of the high-water material-mud composite in the pipeline cannot guarantee that the high-water material-mud composite will maintain fluidity and prevent initial setting when injected into the reclamation face, the slurry mixing system must be set near the reclamation face rather than on the integrated movable platform. In this case, the distance between the integrated movable platform and the reclamation face is determined by the slurry delivery pipeline system for transporting the two types of slurry (A and B) and mud.

[0066] The slurry mixing system refers to a device that fully mixes slurry A, slurry B, and mud to form a high-water-content material-mud composite. Specifically, the slurry mixing system includes a mixer, a mixing pipe, and a slurry flow controller. The outlet of the slurry preparation system is connected to the mixer, the outlet of the mixer is connected to the mixing pipe, and the slurry flow controller is installed on the mixing pipe.

[0067] The flow controller is installed at the end of the slurry delivery pipeline system for the three slurries, namely, slurry A, slurry B, and mud (i.e., at the front end of the pipeline entering the mixer), to strictly control the volume ratio of slurry A and slurry B to 1:1, and to control the final mud content and water-cement ratio by controlling the mud.

[0068] The mixer refers to a device that thoroughly mixes slurry A, slurry B, and mud. The device should be equipped with a stirring and mixing mechanism to ensure thorough mixing of the two slurries. It is important to note that the mixer only stirs and mixes slurry A, slurry B, and mud; it does not store the mixed slurry. That is, after thorough mixing, the slurry is directly transported to the mixing pipe. Otherwise, the mixed slurry may remain in the mixer for too long, causing it to solidify, harden, and block subsequent pipelines.

[0069] The mixing pipe refers to the pipe that allows the slurry to be fully mixed and guides its delivery to the working face. The preferred material for the pipe is a high-strength seamless steel pipe with a smooth inner wall. To improve the mixing effect, blades are required to be installed inside the pipe. The flow velocity of the slurry inside the mixing pipe should not be less than 3 m / s to prevent the slurry from solidifying and settling.

[0070] Preferably, since high-water-content materials have rapid setting properties, once the two slurry materials A and B are mixed, a hydration and hardening reaction will occur rapidly. Therefore, it is necessary to strictly control the residence time of the mixed slurry in the slurry mixing system. This time is related to the water-cement ratio and needs to be designed according to the actual water-cement ratio and the distance from the working surface.

[0071] The dredging operation system refers to the process facilities for injecting high-water-content material-mud slurry composites into the dredging area. Specifically, it includes pipe adapters, flow controllers, dredging pipes, dredging bags, dredging pumps, and containment embankments. The flow controller controls the on / off state and flow rate of the high-water-content material-mud slurry mixture. The dredging pipes transport the slurry mixture to the filling bags, which are containers filled with the high-water-content material-mud slurry mixture for hydration, hardening, and curing. The dredging pump pressurizes the high-water-content material-mud slurry composite to facilitate its ejection to the designated working face. The containment embankments divide the dredging area into several zones and install dredging bags in each zone for segmented dredging. The mixer outlet of the slurry mixing system is connected to a pipe adapter via a mixing pipe. The outlet of the pipe adapter is connected to the slurry filling pipe of the slurry filling operation system. A slurry flow controller is installed on the pipe adapter, and a slurry filling pump is installed on the slurry filling pipe. The outlet of the slurry filling pipe is located inside the slurry filling bag within the embankment of the slurry filling area so that the slurry filling material can be slurried into the slurry filling bag to complete the slurry filling operation.

[0072] Preferably, the entire reclamation area is divided into several zones, and embankments are set at the boundaries of the zones to separate each reclamation zone. Related instruments and equipment can also be transported through the embankments.

[0073] Preferably, the accumulated water in each dredging zone should be drained in advance and the base should be leveled in order to arrange the filling bags.

[0074] Preferably, the primary function of the filling bag in this invention is to provide a space for filling a high-water-content material-mud mixture slurry, where hydration and hardening reactions occur and the slurry is cured. Therefore, the filling bag must have an impermeable function to prevent the high-water-content material-mud mixture slurry from seeping out of the filling bag or water from outside the filling bag from seeping into it. The filling bag can be a traditional rectangular bag, or it can achieve a similar function to a traditional filling bag by laying an impermeable membrane throughout the filling section.

[0075] Preferably, after the water is drained from the hydraulically filled foundation, the soil needs to be properly treated to meet the needs of subsequent projects. Traditional physical and geological treatment methods can be used within the limits permitted by actual construction conditions. If conditions do not permit, a high-moisture grout mixture can be used for treatment; no special requirements are specified here.

[0076] In addition, to facilitate operations at the dredging site, the filling pipe is required to be a flexible pipe. Since the mixing pipe is a rigid pipe and the filling pipe is a flexible pipe, a pipe adapter is needed between the mixing pipe and the filling pipe to allow for the conversion between pipes of different materials.

[0077] The working principle of the novel land reclamation system based on high-water-content materials-mud composite involved in this invention is as follows:

[0078] The water supply system draws water from nearby sources to provide the necessary water for the entire reclamation system. The sand extraction system extracts sediment from the bottom of the designated water area and transports the slurry to the reclamation system for processing into slurry with a predetermined sand content, predetermined particle size distribution, and uniform and stable material. The slurry preparation system prepares high-water-content material A and material B slurries, and then transports the high-water-content material A and material B slurries and the slurry to the vicinity of the reclamation working face through the slurry transportation pipeline system. Under the action of the slurry mixing system, the high-water-content material A and material B slurries and the slurry are mixed to form a high-water-content material-slurry composite. The high-water-content material-slurry composite is transported to the designated reclamation working face through the reclamation operation system and injected into reclamation bags to complete the reclamation operation. After curing, the high-water-content material-slurry composite will quickly solidify to form the land foundation for land reclamation, thereby completing the land reclamation work.

[0079] The land reclamation method based on high-water-content materials-mud composites includes the following steps:

[0080] Step one involves designing the land reclamation operation and making all necessary preparations based on the actual working conditions. This includes rationally dividing and stratifying the sand extraction and reclamation areas according to geological, hydrological, transportation, and schedule technical, safety, and economic indicators; determining the reclamation process; selecting and increasing the number of dredgers; rationally arranging mud transport pipelines; developing a sand dredging and reclamation plan; and formulating a high-water-content material production plan based on the sand dredging and reclamation plan. Finally, it involves completing the drainage, leveling, and reclamation preparation work in the reclamation area.

[0081] Preferably, the water-cement ratio of the high-water-content material in the high-water-content material-mud slurry composite and the mud content in the composite need to be experimentally designed according to the strength design requirements of the foundation in the reclamation area. Generally, as the water-cement ratio increases, the mechanical strength of the high-water-content material-mud slurry composite decreases; as the mud content in the high-water-content material-mud slurry composite increases, the strength of the hardened body formed by the high-water-content material-mud slurry composite increases. However, when the mud content is too high, it will affect the pumpability of the slurry. Therefore, the relevant parameters of the high-water-content material-mud slurry composite need to be tested and designed in advance.

[0082] It should be noted that the "water" in the water-cement ratio of the high-water material-mud composite should include the water content in both the high-water material A and B slurries, as well as the water content in the mud. "Cement" refers specifically to the weight of the four high-water materials A, AA, B, and BB. The mud and sand in the mud act as filler within the hardened high-water material, surrounded by ettringite, thus increasing the strength of the high-water material. Studies have shown that the strength of the hardened body formed by the high-water material-mud composite can be 2-10 times that of the hardened high-water material itself and the soil.

[0083] Step two: The dredger arrives at the designated dredging and sand extraction area and begins dredging operations. Using a mud pump, the slurry is transported through a mud pipe to a mud-water treatment plant for processing, resulting in a uniformly concentrated slurry with a roughly consistent particle size distribution. This slurry is then stored in a mud storage tank for later use. After the dredger arrives, pipeline layout is completed, and system feasibility is verified, dredging operations begin. The sand extraction system draws sediment from the seabed into the sand extraction system, which then processes it into slurry that is transported to the reclamation system for use.

[0084] Preferably, dredging operations should be carried out in sections and layers to fully exploit the sediment resources under the seabed, maximize the efficiency and rationalize the operation of the dredger within its operating range, avoid dredging operations that exceed or approach the maximum operating depth of the dredger, and avoid damage to the dredger.

[0085] Preferably, dredging operations require advance design and planning, and reasonable arrangement of dredging pipelines.

[0086] Preferably, it is necessary to monitor and test the dredged sludge in real time, and monitor and control the particle size and gradation of the sludge so that the sludge treatment device can work as required, and so that the sludge concentration of the sludge treated by the sludge treatment device and stored in the sludge storage device is uniform and the particle size gradation of the sludge is roughly uniform.

[0087] Step 3: Weigh out materials A and AA, materials B and BB respectively in the slurry preparation system, and mix them with water to prepare the corresponding slurries. Then mix slurry A and AA, slurry B and BB respectively to prepare slurry A and slurry B, and store them in the corresponding storage containers for later use.

[0088] Preferably, the mass ratio of the main ingredients of the high-moisture material must be strictly controlled as A:AA:B:BB = 1:0.1:1:0.04, the weighing error of AA and BB shall not exceed 0.5%, and the weighing error of A and B shall not exceed 2%.

[0089] Preferably, the amount of water in the water-cement ratio of the high-water-content material is the sum of the water in the high-water-content material A and B slurries and the water in the mud. Therefore, the amount of water that can be added when preparing high-water-content material A and B slurries needs to be determined by back-calculation based on the water content in the mud, and the water content in slurries A and B must be consistent.

[0090] Preferably, when preparing slurry A, A and AA need to be thoroughly stirred evenly, and when preparing slurry B, B and BB need to be thoroughly stirred.

[0091] Preferably, a stirring device should be installed in the slurry storage devices A and B and the slurry storage device to keep the slurry uniform and stable and prevent delamination and sedimentation.

[0092] Step four involves thoroughly mixing the three slurries (material A, material B, and mud) at predetermined hydraulic pressures and flow rates in a mixer. The mixtures are then further mixed and pressurized through a mixing pipe, and finally enter the backfilling system via a pipeline adapter. Specifically, the mud prepared by the sand extraction system and the high-water-content material slurries A and B are transported separately to the slurry mixing system via pipelines. Under the action of the mixer and mixing pipe, a uniform high-water-content material-mud mixture is prepared.

[0093] Preferably, since the amount of water in the water-cement ratio of the high-water-content material is the sum of the amount of water in the high-water-content material A and B slurries plus the amount of water in the mud, and the strength of the hardened high-water-content material-mud mixture is closely related to the water-cement ratio and sediment content of the high-water-content material, it is necessary to strictly control the flow rates of slurries A and B and the mud.

[0094] Preferably, the slurry mixing system requires that the high-water-content material-slurry mixture be thoroughly and evenly mixed.

[0095] Preferably, due to the rapid setting characteristics of high-water-content materials, the residence time of the high-water-content material-slurry mixture in the pipes of the slurry mixing system and the dredging operation system needs to be strictly controlled. Therefore, the flow velocity of the high-water-content material-slurry mixture (not less than 3 m / s) and the length of the mixing pipe and the dredging pipe need to be strictly controlled. Preferably, the slurry mixing device should be arranged near the dredging operation face.

[0096] Step five involves delivering the high-water-content material-mud mixture to the hydraulic reclamation system at a predetermined flow rate and volume, injecting it into the filling bags to form a hardened high-water-content material-mud mixture. Curing is then performed to complete the reclamation operation. Specifically, the reclamation system delivers the high-water-content material-mud mixture to the reclamation face and begins the reclamation process. The reclamation can be completed in one go or in layers, depending on the actual situation. After the high-water-content material-mud mixture is reclamped into the reclamation area, it maintains good fluidity for a short period and self-levels itself. If the self-leveling effect is insufficient, mechanical vibration or leveling can be used to level the area.

[0097] It is important to note that high-water-content materials retain good recrystallization ability in the early stages of hydration and hardening reaction. Even if the morphology of the initially hardened body is disrupted by mechanical vibration, the high-water-content material-mud mixture can recrystallize and regain its original shape through its recrystallization ability. Therefore, in the initial stage of hydraulic filling operations, mechanical vibration and leveling can be performed on the hardened body of the high-water-content material-mud hydraulic filling.

[0098] Preferably, when the dredging operation is carried out in layers, the surface of the hardened body from the previous dredging operation needs to be roughened before the second dredging operation is carried out, so that the hardened body formed by the two dredging operations can be better integrated into a whole.

[0099] Preferably, after the dredging operation is completed, the high-water-content material-mud dredging hardened body needs to be cured.

[0100] The present invention also provides a novel land reclamation system and method based on high-water-content material-mud composite as the reclamation material. The principle of this method is as follows:

[0101] Traditional land reclamation operations consist of two parts: reclamation and foundation treatment. The design concept involves dredging seabed sediment into the reclamation area, followed by foundation treatment to drain the water from the reclamation soil, thereby reinforcing the soil and achieving predetermined engineering properties to accomplish the goal of land reclamation. It's clear that the core of traditional reclamation lies in obtaining sufficient sediment, then using basic soil mechanics theory and foundation treatment techniques to drain the water from the high-moisture-content reclamation soil, thus consolidating the soil and strengthening the foundation. However, in this process, the water in the reclamation soil is waste material for the entire project and a major cause of the weak strength and large deformation of the reclamation soil.

[0102] The reclamation operation in this invention uses a high-water-content material-mud composite as the reclamation material. The theoretical basis for this is twofold: First, high-water-content materials have the characteristic of "turning water into stone." Through hydration hardening reaction, high-water-content materials can absorb a large amount of water with a small proportion of solid material to form a hardened body. The water content of the hardened body can be as high as 90% or more, and the hardened body has high mechanical strength. Second, the mechanical properties of the high-water-content material-mud composite can be significantly improved by adding a small amount of mud and sand. Adding a small amount of sand and coarse and fine aggregates to high-water-content materials to form a high-water-content material-soil or high-water-content material-aggregate composite can greatly improve the strength of high-water-content materials. For example, according to experimental studies, adding 5%-10% mud and sand to high-water-content materials can increase the strength of high-water-content materials by 2-10 times.

[0103] This invention creatively utilizes these two points to propose a novel hydraulic reclamation system based on a high-water-content material-mud composite. Its core idea lies in "turning water into stone" and "turning waste into treasure." That is, the "waste" water in the mud excavated during the hydraulic reclamation project is transformed into engineering materials for constructing the hydraulic reclamation foundation, and this "waste water" is transformed into a component of the high-water-content material hardened body, that is, turning waste water into "artificial stone."

[0104] Specifically, in this invention, similar to normal reclamation operations, dredgers excavate mud from the seabed. However, this invention does not require draining the water from the mud to achieve complete mud-water separation. Instead, this invention directly utilizes the mud-water mixture. Then, two types of slurries, A and B, are prepared using a high-water-content material slurry preparation system. When mixing slurries A and B to prepare the high-water-content material, the water in the mud can be "turned into stone" to adjust the water-cement ratio of the high-water-content material and ultimately become part of the hardened high-water-content material (mainly the bound water in the ettringite of the hardened high-water-content material). The mud and sand or coarse and fine-grained coral reef stones in the mud can become reinforcing materials in the hardened high-water-content material (i.e., adding mud and sand or coarse and fine-grained coral reef stones to the hardened high-water-content material to act as reinforcement). The mud and sand particles and coarse and fine-grained coral reef particles have high strength, and the interlocking of the mud and sand particles and coarse and fine aggregates can significantly improve the mechanical strength of the hardened high-water-content material. Furthermore, adding silt particles and coarse and fine aggregates to high-water-content materials can significantly improve their corrosion resistance and weathering resistance.

[0105] In addition, Yan Zhiping proposed using high-water-content materials to improve soft soil foundations (see: Yan Zhiping, Yang Hangyu, Zhu Zanling. Feasibility study of applying high-water-content quick-setting materials to soft soil foundation treatment [J]. Guangdong Highway and Transportation, 1999(C00):6.; Yan Zhiping. SEM study of microstructure of high-water-content quick-setting materials-soft soil [J]. Rock and Soil Mechanics, 2004, 025(002):275-278,282.). However, the essence of these studies is still how to achieve soft soil foundation treatment. The core idea is to strengthen soft soil foundations by adding solidifying agents to soft soil. That is, soft soil is the main material framework and structural body, and high-water-content materials are just solidifying agents to fix the water in soft soil.

[0106] In contrast, the problem encountered in this invention is how to achieve land reclamation when there is insufficient silt. Therefore, in this invention, the high-water material is the main material and structural component of the dredged material, while the silt, gravel, and coarse and fine coral reef stones dredged by the dredger are merely fillers between the ettringite crystals within the high-water material, used to improve its mechanical strength. Therefore, it is easy to see that there is a fundamental difference between the two technical approaches.

[0107] Similarly, many traditional techniques for reinforcing soft soil foundations by adding chemical solidifying agents differ fundamentally from this invention. The essence of traditional chemical reinforcement of soft soil foundations is still to use soft soil as the main material and structure, and then add a small amount of solidifying agent to fix the moisture between the soft soil particles, thereby improving the mechanical properties of the soft soil. This invention, however, is the opposite. In this invention, the main material and structure of the dredged material is a high-water-content hardened body, and the silt and gravel aggregate dredged by the dredger are merely internal filling materials for this high-water-content hardened body. Furthermore, this invention does not aim to drain water, but rather to directly transform water into part of the high-water-content hardened body.

[0108] Furthermore, compared with traditional land reclamation operations, the reclamation method proposed in this invention represents a creative breakthrough.

[0109] Traditional land reclamation operations generally consist of two main parts: dredging and soft soil foundation treatment. The dredging part mainly involves dredging slurry from the riverbed and seabed using dredgers and pumping it to the dredging area for filling. After dredging, the dredged soil is treated as soft soil and various soft soil foundation treatment technologies are used to reinforce it.

[0110] The dredging system and method provided by this invention integrate dredging and consolidation in one process. Because the high-water-content material can convert the water in the dredging slurry into part of the hardened high-water-content material, and because the high-water-content material has a rapid-setting effect, the strength of the hardened high-water-content material is far higher than that of ordinary soft soil. Therefore, in this invention, dredging and "consolidation" are combined into one process. Once the dredging is completed and the hardened high-water-content material is cured and solidified, a hardened body with considerable strength is formed, thus completing the reinforcement of the dredged soil.

[0111] Traditional soft soil foundation treatment generally takes a long time, while the high-water-content material hardened body in this invention only needs to be cured for a few days to achieve a strength far exceeding that of ordinary soft soil. Therefore, the land reclamation operation cycle of this invention is greatly reduced.

[0112] Furthermore, compared to the traditional applications of high-water-content materials, the novel land reclamation system and method proposed in this invention, which uses a high-water-content material-mud composite as the fill material, represents a breakthrough and innovation in the application fields, technical design concepts, and corresponding theoretical foundations of high-water-content materials. These breakthroughs and innovations are not directly conceived by those skilled in the art based on existing technologies. Specifically, traditionally, high-water-content materials are used for filling goaf areas. By filling goaf areas with high-water-content materials and utilizing the lateral force of the mine pillars on the high-water-content material fill material, the roof is supported, and the deformation of the surrounding rock and the activity of the overburden are controlled. Essentially, the high-water-content material fill material is under triaxial compression (affected by ground stress, overburden load, and lateral force from the mine pillars). However, the dredging process essentially uses seabed sediment for land reclamation, and there is a fundamental difference between the dredging and filling processes. Moreover, the fill soil is essentially foundation soil, which is essentially under axial compression and has no ground stress (or ground stress is considered zero in foundation engineering). Its performance requirements focus on foundation bearing capacity, which is also axial compressive strength. Therefore, backfilling and dredging are not comparable. The novel land reclamation dredging system and dredging method using high-water-content material-mud composite as dredging material proposed in this invention are inventive.

[0113] Based on the above analysis, it is easy to see that the novel dredging system and dredging method based on high-water-content materials provided by this invention have the following characteristics:

[0114] (1) Turning water into stone. In this invention, a large amount of water from the dredged mud and the water in the water body near the reclamation area is used. Through the hydration hardening reaction of high-water-content materials, a large amount of water is converted into part of the hardened high-water-content material (mainly the bound water of ettringite in the hardened high-water-content material), and the hardened high-water-content material is used for land reclamation in the reclamation area. Since the strength of the hardened high-water-content material is higher than that of ordinary soft soil foundation, this invention achieves the technical effect of "turning water into stone" by using high-water-content materials.

[0115] (2) Less sand used. Since the material used to fill the reclamation area in this invention is not primarily bottom mud and sand, but rather high-water-content materials are used more extensively. High-water-content materials have a very high water-cement ratio and can "turn water into stone," absorbing and fixing a large amount of water through a small amount of solid material to form a hardened body and complete the reclamation. Therefore, the amount of sand used in this invention is greatly reduced.

[0116] (3) Fast construction speed and short construction period. Traditional soft soil foundation treatment generally takes a long time, while the high water content material hardened body in this invention only needs to be cured for a few days to achieve a strength far higher than that of ordinary soft soil. Therefore, the land reclamation operation cycle of this invention is greatly reduced.

[0117] (4) The foundation strength of land reclamation is high. As mentioned earlier, the strength of hardened high-water-content materials is significantly higher than that of soft soil. Moreover, by adding mud, sand, coarse and fine aggregates to the hardened high-water-content material-soil or high-water-content material-aggregate composite, the strength of high-water-content materials can be greatly improved. The strength of the land reclamation area constructed in this way is significantly improved.

[0118] (5) Turning waste into treasure. For reclamation projects, the water in the mud is engineering wastewater, which needs to be discharged and treated. This invention patent proposes to use these traditional "engineering wastewater" to transform it into a part of the high-water-content material hardened body for constructing reclamation materials, thus achieving the effect of turning waste into treasure.

[0119] (6) Materials can be sourced locally. In the reclamation operation of the present invention, materials can be sourced locally, and the water and bottom mud and sand of the nearby water area can be used for reclamation projects. The mud dredged by the dredger can be used for reclamation operations and land reclamation, avoiding the need to transport large amounts of materials from outside.

[0120] (7) Convenient construction and strong operability. This invention proposes to use an integrated movable platform as the platform for the main equipment of the entire dredging system, which can quickly and conveniently transfer the entire dredging system and arrange the entire dredging system reasonably near the dredging work surface, which is convenient for construction. Moreover, since the two types of high water content materials A and B do not solidify or form a bottom after more than 24 hours when placed or transported separately, they have excellent pumpability. This dredging system is all transported by pipeline, which is convenient and simple to construct and does not occupy a large amount of work area.

[0121] (8) Low cost. Using high-water-content materials to construct the reclamation body allows for the extensive use of local water as a construction material; at the same time, since the entire reclamation system is placed on a movable platform, the reclamation system can be arranged nearby, avoiding unnecessary transportation costs; the reclamation system is transported by pipeline, and the construction process is simple and convenient; all of the above measures can significantly save construction costs.

[0122] (9) Environmentally friendly and produces no large amount of engineering waste. High-water-content materials are non-toxic, harmless, and non-corrosive, making their use in land reclamation environmentally friendly. Moreover, the entire reclamation process does not generate a large amount of engineering waste.

[0123] In summary, this invention provides a novel land reclamation system and method based on high-water-content materials, which can perfectly solve the shortcomings of existing technologies. Attached Figure Description

[0124] Figure 1 This is a schematic diagram of a land reclamation system based on a high-water-content material-mud composite.

[0125] The components include: 1. Water source; 2. Water pump; 3. Water pipe; 4. Water purifier; 5. Water storage device; 6. B slurry preparation system; 7. A slurry preparation system; 8. AA material silo; 9. A material silo; 10. A material inlet flow controller; 11. AA material inlet flow controller; 12. A slurry storage tank; 13. A slurry flow controller; 14. AA slurry storage tank; 15. AA slurry flow controller; 16. A slurry storage tank; 17. A slurry delivery pump; 18. A slurry flow controller; 19. Mixer; 20. Mixed slurry flow controller; 21. Mixing pipe; 22. Pipe adapter; 23. Blow-fill pump; 24. Blow-fill. 25. Pipe; 26. Filling bag; 27. Embankment; 28. B slurry flow controller; 29. ​​B slurry delivery pump; 30. Mud slurry flow controller; 31. B slurry storage tank; 32. Mud storage tank; 33. BB slurry flow controller; 34. B slurry flow controller; 35. BB slurry storage tank; 36. B slurry storage tank; 37. BB material inlet water flow controller; 38. B material inlet water flow controller; 39. BB material bin; 40. B material bin; 41. Slurry processor; 42. Mud pump; 43. Dredger; 44. Dredging grab bucket; 45. Sand extraction area; 46. Mud conveying pipe; 47. Integrated mobile platform. Detailed Implementation

[0126] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0127] A certain marine reclamation project is located far from the mainland, making sand and gravel transportation inconvenient. Initially, a hydraulic reclamation process was planned. However, the surrounding seabed lacks sufficient sand and gravel, making traditional hydraulic reclamation impossible. Therefore, the novel hydraulic reclamation system technology based on high-water-content materials, as described in this invention, was adopted to complete the reclamation operation. The project is described in detail below:

[0128] According to the appendix Figure 1The land reclamation system based on high-water-content material-mud composite shown includes seven parts: an integrated mobile platform, a sand extraction system, a water supply system, a slurry preparation system, a slurry mixing system, a slurry delivery pipeline system, and a reclamation operation system. The sand extraction system extracts sand from the bottom of a predetermined water area or sea area and then transports the mud slurry through pipelines to an integrated movable platform. After processing, the mud slurry is stored in a mud slurry storage device for later use. The other end of the mud slurry storage device is connected to the slurry delivery pipeline system via a pipeline. The water supply system extracts water from the predetermined water area or sea area and supplies water to the entire reclamation system. The water purifier and water storage device of the water supply system are placed on the integrated movable platform. The water storage device is connected to the slurry preparation system via a pipeline to supply water to it. The slurry preparation system is placed on the integrated movable platform. One end of the slurry preparation system is connected to the water supply system via a pipeline, and the other end of the slurry preparation system is connected to one end of the slurry delivery pipeline system via a pipeline. The other end of the slurry delivery pipeline system is connected to one end of the slurry mixing system via a pipeline. The other end of the slurry mixing system is connected to the reclamation operation system via a pipeline. The reclamation operation system performs reclamation operations to complete the land reclamation.

[0129] Among them, the integrated mobile platform 47 refers to a mobile integrated platform used to install and fix the main instruments and equipment of the entire reclamation system. In this embodiment, the integrated mobile platform uses a powered sea vessel or a towable vessel. During the actual construction process, the integrated mobile platform can be quickly moved to the optimal position according to the changes in the working face position and sand extraction position.

[0130] The sand extraction system is used to extract sand from a predetermined water area or sea area and then transport the mud to an integrated mobile platform for mud treatment. The sand extraction system includes a mud storage device (i.e., mud storage 32), a mud treatment device (i.e., mud and water processor 41), a mud pump 42, a dredger 43, a dredging grab bucket 44, and a mud conveying pipe 46. The mud storage 32 is located at the end of the mud pump 30 away from the slurry mixing system. The mud storage 32 is connected to the discharge port of the mud and water processor 41 through a mud pipe. The inlet of the mud and water processor 41 is connected to the mud pump 42. The mud pump 42 is mounted on the dredger 43. The inlet of the mud pump 42 is connected to the mud conveying pipe 46. The dredging device 44 is located at the end of the mud conveying pipe 46 away from the mud pump 42.

[0131] The water supply system provides the necessary water for the entire reclamation system. The water supply system includes a water pump 2, a water pipe 3, a water purifier 4, and a water storage device 5. The outlet of the water pump 2 is connected to the water purifier 4 via the water pipe 3. The outlet of the water purifier 4 is connected to the water storage device 5. The outlet of the water storage device 5 is connected to the slurry preparation system via an outlet pipe. In this embodiment, the water source 1 is a natural water body near the reclamation working face.

[0132] The slurry preparation system is mainly used to prepare two types of slurries, A and B, for high-water materials. The slurry preparation system is divided into Slurry A Preparation System 7 and Slurry B Preparation System 6. The equipment for Slurry A and Slurry B is identical. Each production line consists of a silo, weighing device, conveying device, stirring device, storage device, mixing device, and slurry storage device. Specifically, the slurry preparation system consists of Slurry A Preparation System 7 and Slurry B Preparation System 6. The equipment for Slurry A Preparation System 7 and Slurry B Preparation System 6 is identical. Slurry A Preparation System 7 includes an AA material silo 8, an AA material inlet flow controller 11, an A material silo 9, an A material inlet flow controller 10, an AA slurry storage tank 14, an A slurry storage tank 12, an A slurry flow controller 13, an AA slurry flow controller 15, and an A material slurry storage tank 16. The AA material silo 8 is connected to the AA slurry storage tank 14 via an AA material pipeline, and the A material silo 9 is connected to the A material storage tank 16 via an A material pipeline. The slurry storage tank 12, the AA material pipeline, and the middle section of the A material pipeline are respectively connected to the outlet pipeline of the water storage device 5. An AA material inlet flow controller 11 is installed at the interface between the outlet pipeline of the water storage device 5 and the AA material pipeline. An A material inlet flow controller 10 is installed at the interface between the outlet pipeline of the water storage device 5 and the A material pipeline. The outlet of the AA slurry storage tank 14 is connected to the A material slurry storage tank 16 via an AA slurry pipe. The outlet of the A slurry storage tank 12 is connected to the A material slurry storage tank 16 via an A slurry pipe. An AA slurry flow controller 15 is installed on the AA slurry pipe, and an A slurry flow controller 10 is installed on the A slurry pipe. The discharge port of the slurry preparation system 13 and the slurry storage tank 16 are connected to the slurry conveying pipeline system. The slurry preparation system 6 includes a B silo 40, a BB silo 39, a B material inlet water flow controller 38, a BB material inlet water flow controller 37, a B slurry storage tank 36, a BB slurry storage tank 35, a B slurry flow controller 34, a BB slurry flow controller 33, and a B slurry storage tank 31. The BB silo 39 is connected to the BB slurry storage tank 35 through the BB material pipeline. The B silo 40 is connected to the B slurry storage tank 36 through the B material pipeline. The BB material pipeline and the middle part of the B material pipeline are respectively connected to water storage devices. A BB material inlet flow controller 37 is installed at the interface between the outlet pipe of the water storage device 5 and the BB material pipe, and a B material inlet flow controller 38 is installed at the interface between the outlet pipe of the water storage device 5 and the B material pipe. The outlet of the BB slurry storage device 35 is connected to the B material slurry storage device 31 through the BB slurry pipe. The outlet of the B slurry storage device 36 is connected to the B material slurry storage device 31 through the B slurry pipe. A BB slurry flow controller 33 is installed on the BB slurry pipe, and a B slurry flow controller 34 is installed on the B slurry pipe. The outlet of the B material slurry storage device 31 is connected to the slurry conveying pipeline system.

[0133] The high-water material prepared by the slurry preparation system has the following characteristics:

[0134] (1) The material is composed of two materials, A and B. Material A is made of bauxite and gypsum, and is formulated with a composite super-retarding dispersant (also known as AA); Material B is made of gypsum and lime mixed and ground, and is formulated with a small amount of composite quick-setting agent (also known as BB).

[0135] (2) The material has the characteristic of high water content, with a water content of up to 87%~90% and a water-cement ratio of 2.2:1~2.57:1. Based on this, the ultra-high water content material developed has a water volume of more than 95% and a water-cement ratio of up to 11:1.

[0136] (3) Good pumpability: Two solid powders, A and B, are mixed with water to make two slurries. They do not solidify or form a bottom after being left alone for more than 24 hours, making them suitable for mechanized pumping construction.

[0137] (4) Rapid setting: The A and B slurries solidify rapidly after mixing, with an initial setting time of no more than 30 minutes.

[0138] (5) High early strength: The stone body formed after mixing A and B slurries can reach 0.5~1MPa in 1 hour, 2MPa in 2 hours, and more than 5MPa in 7 days.

[0139] (6) Environmentally friendly, non-toxic, harmless and non-corrosive.

[0140] (7) Material A has a pH of 9~10, which is weakly alkaline; Material B has a pH of 11~12, which is alkaline.

[0141] (8) The effective shelf life of solid powders A and B is 6 months.

[0142] (9) The stone body formed by high water content material has the characteristic of recrystallization to restore strength after early destruction.

[0143] (10) High water content materials mainly use aluminum vanadium stone, lime and gypsum as the main raw materials. The material manufacturing process is simple and the cost is low.

[0144] Preferably, in this invention, the mass ratio of the main ingredients of the high-water-content material is A:AA:B:BB = 1:0.1:1:0.04.

[0145] Among them, the mineral components of A are mainly anhydrous calcium sulfoaluminate (3CaO·3Al2O3·CaSO4) and dicalcium silicate (2CaO·SiO2).

[0146] The main component of material B is anhydrite (CaSO4), accounting for approximately 65%, followed by dolomite (CaMg(CO3)2), and also contains calcined gypsum (CaSO4·0.5H2O) and CaCO3 and Ca(OH)2 minerals. In the hydration and hardening reaction of high-water-content materials, gypsum dissolves rapidly in silicate cement paste and quickly reacts with 3CaO•Al2O3 to produce fine ettringite, forming a coating around cement particles. This coating acts as a buffer for hydration, reduces concrete shrinkage, improves corrosion resistance, and enhances early strength. Adding gypsum to lime significantly reduces the volume expansion during lime slaking.

[0147] The main chemical component of AA is Na2CO3, which accounts for as much as 97%; followed by BaBiO3, which accounts for only about 3%. The main functions of AA are retarding, suspension, and dispersion.

[0148] The main chemical components of BB are SiO2 (approximately 54%), CaSO4 (approximately 31%) and Rb2FeZr(PO4)3 (approximately 15%), and its main functions are rapid coagulation, suspension, dispersion and activation.

[0149] Preferably, the water-cement ratio of high-water-content materials varies depending on the amount of water added. Common water-cement ratios range from 2:1 to 11:1 for ultra-high-water-content materials, corresponding to compressive strengths between 6 MPa and 0.5 MPa. Changes in the water-cement ratio affect the hydration and hardening reaction process of high-water-content materials, and further influence the water content, bulk density, microstructure development, and macroscopic mechanical properties of the high-water-content material aggregate.

[0150] The hydration hardening product of high-water-content materials is ettringite (chemical formula: 3CaO·Al₂O₃·3CaSO₄·32H₂O), which accounts for more than 90% of the solid mass of the stone. The hydration hardening reaction is as follows:

[0151]

[0152] This reaction causes a large amount of free water in the high-water-content material slurry to participate in the hydration reaction and be transformed into bound water of ettringite, ultimately leading to the formation of high-water-content material stone bodies.

[0153] Since the applicable working environment of this invention includes seawater, experimental research has shown that the hydration hardening reaction of the high-water material used in this invention can occur normally in seawater. Furthermore, the mineral components in the main ingredients of the high-water material will react chemically with ions in seawater to produce Zincgartrellite (chemical formula: Pb(Zn,Fe)). 3+The presence of Zincgartrellite (Cu)₂(AsO₄)₂ • 2(H₂O,OH)₂ fills the pores inside the ettringite crystals. The interlocking of Zincgartrellite and ettringite crystals enhances the stability of the microstructure, thereby improving the mechanical properties of the high-water material. Therefore, the high-water material used in this invention can be adapted to seawater environments.

[0154] The slurry conveying pipeline system includes pipelines and pressurizing devices for conveying slurry A and B from slurry storage devices A and B to the mixer, and pipelines and pressurizing devices for conveying mud slurry from mud storage devices to the mixer. Specifically, it includes a slurry A conveying pump 17, a slurry A flow controller 18, a mud slurry conveying pump 30, a mud slurry flow controller 29, and a pressurizing pump. The outlet of slurry A storage device 16 is connected to slurry A conveying pump 17. The output end of slurry A conveying pump 17 is connected to the slurry mixing system. A slurry A flow controller 18 is installed on the pipeline between slurry A conveying pump 17 and the slurry mixing system. The input end of the slurry mixing system is connected to mud slurry conveying pump 30. A mud slurry pump 30 is installed on the pipeline near the slurry mixing system. The pipeline between the slurry flow controller 29, the slurry conveying pump 30, and the slurry mixing system is equipped with a slurry pressurization pump to ensure that the slurry is smoothly transported through the slurry conveying pipeline to the subsequent process. The slurry conveying pipeline system includes a slurry conveying pump 28, a slurry flow controller 27, and the outlet of the slurry storage tank 31 is connected to the slurry conveying pump 28. The output end of the slurry conveying pump 28 is connected to the slurry mixing system. The slurry flow controller 27 is installed on the pipeline between the slurry conveying pump 28 and the slurry mixing system.

[0155] The slurry mixing system includes a mixer 19, a mixing pipe 21, and a slurry flow controller 20. The outlet of the slurry preparation system is connected to the mixer 19, and the outlet of the mixer 19 is connected to the mixing pipe 21. The mixing pipe 21 is equipped with the slurry flow controller 20. The mixing pipe 21 is made of high-strength seamless steel pipe with a smooth inner wall, and blades are installed inside the mixing pipe 21 to enhance the mixing effect.

[0156] The dredging system includes a pipe adapter 22, a dredging pump 23, a dredging pipe 24, dredging bags 25, and embankments 26. The outlet of the mixer 19 is connected to the pipe adapter 22 via a mixing pipe 21. The outlet of the pipe adapter 22 is connected to the dredging pipe 24. A mixing slurry flow controller 20 is installed on the end of the mixing pipe 21 away from the pipe adapter 22. The end of the pipe adapter 22 away from the mixing pipe 21 is connected to the dredging pump 23. The outlet of the dredging pump 23 is connected to the dredging pipe 24. The predetermined dredging area is divided into several zones, and embankments 26 are set at the zone boundaries to separate the dredging zones. Dredging bags 25 are installed in each zone for segmented dredging. Dredging operations are carried out by sequentially placing the outlet of the dredging pipe 24 into the dredging bags 25 of each zone.

[0157] This embodiment also provides a method for using the above-mentioned novel dredging system based on high-water-content materials, the method comprising:

[0158] (1) Preparation for reclamation: Design and prepare the reclamation construction process according to the actual working conditions. Based on the surrounding topography, geology, meteorology, hydrology, transportation and engineering requirements, select the sand extraction area 45 and water source 1, determine the dredging, water intake and reclamation plan, determine the selection and layout of relevant instruments and equipment, and complete various preparatory work for dredging, water intake and reclamation.

[0159] (2) Dredging operation. According to the dredging operation plan, the dredger 43 enters the site and sails to the designated dredging and sand extraction area, and then begins dredging operations. Under the action of the mud pump 42, the mud is transported to the mud processor 41 through the mud pipe 46. Under the processing of the mud processor 41, a mud slurry with uniform concentration and roughly uniform particle size distribution is obtained and stored in the mud storage tank 32 (i.e., mud silo) for later use. The mud storage tank 32 is equipped with a stirrer and maintains uniform stirring to keep the mud in the mud storage tank 32 homogeneous.

[0160] (3) Preparation of high-water-content materials A and B slurries. In the A slurry preparation system 7, material A and material AA are stored in material A silo 9 and material AA silo 8, respectively. Material A and material AA required for preparing high-water-content materials are weighed using a discharge device; a predetermined amount of water is injected through material A inlet flow controller 10 and material AA inlet flow controller 11; material A and material AA are stirred with water to obtain slurry A and slurry AA, respectively. Slurry A is stored in slurry storage container 12, and slurry AA is stored in slurry storage container 14. The flow rates of slurry A and slurry AA are controlled by flow controller 13 and flow controller 15, respectively, and then mixed by a mixer to obtain slurry A, which is stored in slurry storage container 16.

[0161] Since the instruments and equipment of the A slurry preparation system 7 and the B slurry preparation system 6 are exactly the same, the B slurry can be obtained and stored in the B slurry storage container 31 by a similar method.

[0162] (4) Preparation of high-water-content material-mud mixture slurry. The material A slurry is pressurized by pump 17 and, under the flow control of pump 18, a predetermined flow rate of material A slurry is delivered to mixer 19. Similarly, the material B slurry is pumped by pump 28 and, under the flow control of pump 27, a predetermined flow rate of material B slurry is delivered to mixer 19. The mud slurry is pumped by pump 30 and, under the flow control of pump 29, a predetermined flow rate of mud slurry is delivered to mixer 19. Then, the material A slurry, material B slurry, and mud slurry are thoroughly mixed in mixer 19 with predetermined pressure and flow rates. Afterward, they are further mixed and pressurized through mixing pipe 21, and finally, through pipe adapter 22, they enter the dredging operation system from mixing pipe 21.

[0163] (5) High-water-content material-mud mixture slurry backfilling operation. Under the control of the slurry flow controller 20, the high-water-content material-mud mixture slurry with a predetermined flow rate and flow rate is delivered to the backfilling operation system. The backfilling pipe 24 is a flexible pipe to facilitate operation at the backfilling site. The pipe adapter 22 realizes the conversion between the rigid mixing pipe 21 and the flexible backfilling pipe 24. The high-water-content material-mud mixture slurry with a predetermined hydraulic pressure and flow rate is delivered to the backfilling construction surface through the flexible backfilling pipe 24 and injected into the filling bag 25, where a hydration and hardening reaction occurs, ultimately forming a high-water-content material-mud hardened body. The high-water-content material-mud hardened body is subsequently cured after backfilling, and the relevant curing methods and requirements can be implemented with reference to the concrete curing standards.

[0164] The working process of this invention is as follows: Based on the actual working conditions, the hydraulic reclamation construction process is designed and various preparatory work is carried out before construction. A retaining wall 26 is constructed in advance, and hydraulic reclamation bags 25 are placed inside the retaining wall 26. A dredger enters the site and heads to the designated dredging and sand extraction area, then begins dredging operations. Under the action of the mud pump 42, the mud slurry is transported through the mud pipe 46 to the mud and water processor 41 for processing to obtain mud slurry with uniform concentration and roughly uniform particle size distribution, which is then stored in the mud slurry storage container 32 for later use. Materials A and AA, and materials B and BB are weighed in the material preparation system and mixed with water to obtain the corresponding slurry. Then, slurry A and AA, slurry B and BB are mixed to prepare slurry A and slurry B, and stored in their respective storage containers for later use. Slurry A, slurry B and mud are thoroughly mixed in mixer 19 at a predetermined hydraulic pressure and flow rate, and then further mixed and pressurized in mixing pipe, and finally enter the dredging operation system from mixing pipe 21 through pipe adapter 22. The high water material-mud mixture with a predetermined flow rate and hydraulic pressure is transported through the dredging operation system and injected into filling bag 25 to finally form a hardened high water material-mud body, which is then cured and the dredging operation is finally completed.

[0165] The novel hydraulic reclamation system and method based on high-water-content materials provided by this invention have the advantages of turning water into stone and waste into treasure, using locally sourced materials, using less sand, fast construction speed, short construction period, high foundation strength for land reclamation, convenient construction, strong operability, low cost, environmental friendliness and no large amount of engineering waste generated.

[0166] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A land reclamation system based on high-water-content materials-mud composites, characterized in that, The system includes an integrated mobile platform, a sand extraction system, a water supply system, a slurry preparation system, a slurry mixing system, a slurry delivery pipeline system, and a dredging operation system. The integrated mobile platform has a sand extraction system and a water supply system at one end, a slurry mixing system at the other end, and a slurry preparation system in the middle. The water supply system is connected to the input end of the slurry preparation system, the output end of the slurry mixing system is connected to the dredging operation system, the output end of the slurry preparation system is connected to the sand extraction system through the slurry delivery pipeline system, and the slurry delivery pipeline system is connected to the input end of the slurry mixing system. The slurry preparation system consists of two systems, A and B, with identical equipment in both systems. The slurry preparation system is mainly used to prepare two types of slurries, A and B, for high-water materials. High-water-content material is a type of cementitious material, made by mixing four solid powders (A, AA, B, and BB) with water to create four slurries (A, AA, B, and BB). The main mineral components of A are anhydrous calcium sulfoaluminate 3CaO·3Al2O3·CaSO4 and dicalcium silicate 2CaO·SiO2; Material B mainly contains anhydrite (CaSO4), reaching 65%, followed by dolomite (CaMg(CO3)2), and also contains calcined gypsum (CaSO4·0.5H2O) and mineral components such as CaCO3 and Ca(OH)2. The main chemical component of AA is Na2CO3, which accounts for as much as 97%; the second largest component is BaBiO3, which accounts for only 3%. The main functions of AA are retarding, suspension, and dispersion. The main chemical components of BB are 54% SiO2, 31% CaSO4 and 15% Rb2FeZr(PO4)3. Its main functions are rapid coagulation, suspension, dispersion and activation. Then, slurries A and AA are mixed to form slurry A, and slurries B and BB are mixed to form slurry B. Slurries A and B do not solidify or form a bottom when left alone for more than 24 hours, making them suitable for mechanized pumping construction. After the two slurries A and B are mixed, they quickly solidify into a high-water-content material stone body. Mud treatment equipment refers to the equipment that processes mud to meet the requirements for subsequent use by adjusting the sand content, mud-sand material characteristics, and sand particle size distribution. Mud treatment equipment includes filter screens, hydrocyclones, solid-liquid mixing devices, mud mixing tanks, slurry pumps, liquid inlet and outlet devices, as well as auxiliary equipment such as motors and stirring devices. The sand extraction system includes a dredger, a mud pump, a mud pipeline, a booster pump, a mud treatment device, and a mud storage device. The mud pump is mounted on the dredger, with one end connected to the dredger and the other end connected to one end of the mud pipeline that pressurizes the mud dredged by the dredger to the mud treatment device. A booster pump is installed in the middle of the mud pipeline to increase the hydraulic pressure inside the pipeline when the pipeline is too long and the hydraulic pressure inside the pipeline is insufficient. The other end of the mud pipeline is connected to the mud treatment device, which is connected to the mud storage device through a pipeline. The working principle of the mud treatment device is as follows: the particle size distribution in the mud is controlled by a filter screen composed of several coarse and fine mesh screens; then, the mud with different particle size combinations is separated into solid and liquid by a hydrocyclone; then, the solid and liquid phases separated by the hydrocyclone are remixed by a solid-liquid mixing device to prepare a mud with a predetermined sand content, predetermined particle size distribution, and uniform and stable material. The mud obtained by the solid-liquid mixing device is then temporarily stored in a mud mixing tank and further mixed by a stirring device to obtain a mud with a predetermined sand content, predetermined particle size distribution, and uniform and stable material. The slurry mixing system includes a mixer, a mixing pipe, and a slurry flow controller. The outlet of the slurry preparation system is connected to the mixer, the outlet of the mixer is connected to the mixing pipe, and the slurry flow controller is installed on the mixing pipe. The slurry mixing system refers to a device that fully mixes slurry A, slurry B, and mud to form a high-water-content material-mud composite. A flow meter is installed at the end of the slurry conveying pipeline system of the three slurries A, B, and mud to strictly control the volume ratio of slurry A and B to 1:1, and to control the final mud content and water-cement ratio by controlling the mud.

2. The land reclamation system based on high-water-content material-mud composite as described in claim 1, characterized in that, The integrated mobile platform refers to a mobile integrated platform used for installing and fixing instruments and equipment in the dredging and filling system.

3. The land reclamation system based on high-water-content material-mud composite as described in claim 1, characterized in that, The water supply system includes a water pump, a water pipe, a water purifier, and a water storage device. The outlet of the water pump is connected to the water purifier through the water pipe, the outlet of the water purifier is connected to the water storage device, and the outlet of the water storage device is connected to the slurry preparation system through an outlet pipe.

4. The land reclamation system based on high-water-content material-mud composite as described in claim 1, characterized in that, Both the A and B pulping systems consist of a silo, a weighing device, a conveying device, a mixing device, a liquid storage device, a mixing device, and a slurry storage device. The A and B pulping systems are equipped with a weight controller to control the weighing of solid materials, a flow controller to control the flow of water, slurry, and material, and a delivery pump to provide pumping pressure. The silo, weighing device, conveying device, liquid storage device, mixing device, and slurry storage device are connected by pipelines. The silo is connected to one end of the weighing device via a pipeline, the other end of the weighing device is connected to one end of the conveying device via a pipeline, the other end of the conveying device is connected to one end of the liquid storage device via a pipeline, the other end of the liquid storage device is connected to one end of the mixing device via a pipeline, the other end of the mixing device is connected to one end of the slurry storage device via a pipeline, and the other end of the slurry storage device is connected to the slurry conveying system via a pipeline. Both the liquid storage device and the slurry storage device have built-in mixing devices.

5. The land reclamation system based on high-water-content material-mud composite as described in claim 1, characterized in that, The slurry conveying pipeline system includes a slurry conveying pump, a slurry flow controller, a mud conveying pump, a mud flow controller, and a pressurizing pump. The outlet of the slurry storage tank is connected to the slurry conveying pump. The output end of the slurry conveying pump is connected to the slurry mixing system. A slurry flow controller is installed on the pipeline between the slurry conveying pump and the slurry mixing system. The input end of the slurry mixing system is connected to the mud conveying pump. A mud flow controller is installed on the pipeline near the end of the mud conveying pump that is close to the slurry mixing system. A pressurizing pump is installed on the pipeline between the mud conveying pump and the slurry mixing system to ensure that the mud is smoothly conveyed through the mud conveying pipeline to the pressurizing pump for subsequent processes.

6. The land reclamation system based on high-water-content material-mud composite as described in claim 1, characterized in that, The mixing tube is made of high-strength seamless steel pipe with a smooth inner wall, and blades are installed inside the mixing tube to enhance the mixing effect.

7. The land reclamation system based on high-water-content material-mud composite as described in claim 1, characterized in that, The slurry filling system includes a pipe adapter, a flow controller, a slurry filling pipe, a slurry filling bag, a slurry filling pump, and a retaining wall. The outlet of the mixer in the slurry mixing system is connected to the pipe adapter via a mixing pipe, and the outlet of the pipe adapter is connected to the slurry filling pipe. A flow controller for the mixed slurry is installed on the pipe adapter, and a slurry filling pump is installed on the slurry filling pipe. The outlet of the slurry filling pipe is located inside the retaining wall of the slurry filling area, and a slurry filling bag is installed inside the retaining wall.

8. A land reclamation method based on high-water-content materials-mud composites, characterized in that, The land reclamation system based on high-water-material-mud composite as described in any one of claims 1-7 includes the following steps: Step 1, designing the land reclamation operation and making various preparatory work for the reclamation construction process according to the actual working conditions. Step 2: The dredger enters the site and heads to the designated dredging and sand extraction area, and then begins dredging operations. Under the action of the mud pump, the mud is transported through the mud pipe to the mud and water processor for processing to obtain mud with uniform concentration and uniform particle size distribution, and then stored in the mud storage tank for later use. Step 3: Weigh out materials A and AA, materials B and BB respectively in the slurry preparation system, and mix them with water to prepare the corresponding slurry. Then mix slurry A and AA, slurry B and BB respectively to prepare slurry A and slurry B, and store them in the corresponding storage containers for later use. The mass ratio of the main ingredients in the high-water-content material is A:AA:B:BB = 1:0.1:1:0.04; The water-cement ratio of high-water-content materials varies depending on the amount of water added; the common water-cement ratio is mainly between 2:1 and 11:1 for ultra-high-water-content materials, with corresponding compressive strengths between 6 MPa and 0.5 MPa. Step 4: The three slurries, namely material A slurry, material B slurry, and mud slurry, are thoroughly mixed in a mixer at a predetermined flow rate. Then, they are further mixed in a mixing pipe to form a high-water-content material-mud slurry mixture, which is then pumped and finally enters the dredging operation system from the mixing pipe through a pipe adapter. Step 5: The high-water material-mud mixture slurry with a predetermined flow rate and hydraulic pressure is transported to the dredging operation system and injected into the filling bag to form a hardened high-water material-mud body. Then, it is cured and the dredging operation is finally completed.

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