Soft soil foundation drainage consolidation system

Abstract

The invention relates to a soft soil foundation drainage consolidation system, and belongs to the technical field of soft soil foundation treatment. Comprising a soft soil layer, a water stopping module and a supporting module, a drainage module comprises a drainage well and a drainage pipe network, a gravity pressurization module comprises a vertical frame, a movable truss and a pressurization vertical arm, and an intelligent monitoring feedback module comprises pore water pressure sensors buried in the soft soil layer at different depths and flow sensors arranged on the drainage pipe network. The regulation and control unit is integrated on the remote monitoring terminal; and the self-adaptive backwashing module comprises a washing device arranged in the drainage well, an annular backwashing pipe and an electromagnetic pulse valve. In the prior art, the pressurization process depends on experience regulation and cannot respond to the pressure change in the soil body; and the drainage well lacks an anti-blocking mechanism, and the water discharge amount is obviously reduced after long-term operation.

Description

Technical Field

[0001] The invention belongs to the technical field of soft soil foundation treatment, and in particular relates to a soft soil foundation drainage consolidation system. Background Art

[0002] Traditional soft foundation treatment methods suffer from long construction periods, rapid loss of drainage efficiency, and insufficient deep reinforcement. Vacuum preloading takes over nine months to treat soft soil and suffers from the loss of vacuum transmission beneath the membrane. Heaped load preloading is prone to lateral deformation, and combined static and dynamic drainage methods are poorly adapted to complex formations. In existing technologies, blockage of drainage wells and seepage holes reduces drainage efficiency, and manual dredging requires interruption of construction.

[0003] The patent with announcement number CN114045812B provides a gravity-based soft soil foundation drainage and consolidation system, including a soft soil layer, a water-stop module is arranged in the soft soil layer, the water-stop module encloses a construction area, and a support module, a drainage module and a gravity pressure module are arranged in the construction area. The support module is arranged above the soft soil layer, and the drainage module is arranged within the area of ​​the support module. An equipment installation area is left between the support module and the water-stop module, and the gravity pressure module is arranged in the equipment installation area. The water-stop module in this application distinguishes the construction area from other areas, making it convenient to perform drainage and consolidation treatment on the construction area. The drainage module is then arranged within the area enclosed by the water-stop module according to the planned position, and the support module is then laid in the construction area. Finally, the gravity pressure module is installed so that the gravity pressure module applies gravity to the support module, and the entire support module applies pressure to the soft soil foundation, which can quickly perform an overall drainage operation on the soft soil foundation.

[0004] Although the existing technology improves drainage efficiency by gravity pressure during use, it has the following shortcomings:

[0005] The pressurization process relies on experience-based control and cannot respond to changes in internal soil pressure; the drainage wells lack an anti-blocking mechanism, and the water flow rate will drop significantly after long-term operation. Summary of the Invention

[0006] The present invention provides a soft soil foundation drainage consolidation system, which is used to solve the technical problems in the existing technology that the pressurization process relies on experience-based control and cannot respond to changes in internal soil pressure; the drainage well lacks an anti-blocking mechanism, and the water flow rate decreases significantly after long-term operation.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] The soft soil foundation drainage and consolidation system includes: a soft soil layer, a water-stopping module, a support module, a drainage module and a gravity pressure module. The water-stopping module is arranged in the soft soil layer to enclose the construction area. The support module includes a sand cushion layer and a steel structure support layer with avoidance holes. The drainage module includes a drainage well and a drainage network. The gravity pressure module includes a stand, a mobile truss and a pressure arm. It also includes: an intelligent monitoring and feedback module, including pore water pressure sensors buried at different depths in the soft soil layer, a flow sensor arranged in the drainage network, and a control unit integrated in the remote monitoring terminal, the control unit is electrically connected to the drive component of the gravity pressure module; an adaptive backwash module, including a flushing device arranged in the drainage well, the flushing device includes an annular backwash pipe and an electromagnetic pulse valve, the annular backwash pipe is arranged around the inner wall of the drainage well, and its side wall is provided with backwash holes staggered at 45 degrees with the seepage holes, and the electromagnetic pulse valve is connected to the main drainage pipe of the drainage network.

[0009] Furthermore, the control unit has a built-in depth pressure gradient algorithm. When the pore water pressure sensor detects that the pressure difference at a depth of 10m exceeds 0.05MPa, it automatically adjusts the pressure application frequency of the pressure arm to 8-12 times / hour and increases the load of the counterweight block by 10-20%.

[0010] Furthermore, the backwash pressure of the flushing device is 0.3-0.5 MPa, the duration of a single pulse is 5-10 seconds, and it is triggered by flow sensor data. When the drainage volume decays by more than 20%, the backwash program is automatically started.

[0011] Furthermore, the pressurized vertical arm also includes a pressure distribution adjustment component, including a flexible pressure pad arranged on the bottom surface of the outer arm and micro pressure sensors distributed in the pad. The flexible pressure pad is made of shape memory alloy material and adjusts the local pressure intensity according to the instructions of the control unit.

[0012] Furthermore, a seepage monitoring pipe is provided inside the water-stop pile of the water-stop module. The seepage monitoring pipe has a built-in optical fiber sensor to monitor the hydraulic connection of the construction area boundary in real time, and the data is transmitted to the control unit for boundary correction.

[0013] The present invention provides a soft soil foundation drainage consolidation system, which has the following beneficial effects:

[0014] Through the collaboration of multiple modules, efficient drainage and consolidation of soft soil foundations can be achieved; through the intelligent monitoring and control unit, the problem of pressurization relying on experience and delayed response can be solved; through adaptive backwashing, the problem of reduced water flow caused by drainage well blockage can be solved; through the pressure distribution adjustment component, targeted pressurization can be achieved in complex geological areas; through the seepage monitoring and control unit, corrections can be made to ensure stable and reliable water-stopping effects in the construction area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic structural diagram of a drainage well and a flushing device in the soft soil foundation drainage and consolidation system provided by the present invention;

[0017] Figure 2 This is a schematic diagram of the distribution structure of the gravity pressure module and pressure sensor in the soft soil foundation drainage consolidation system provided by the present invention.

[0018] In the figure: 11-drainage well; 12-seepage hole; 13-drainage network; 14-main drainage pipe; 41-vertical frame; 42-movable truss; 43-pressurization vertical arm; 44-jacket arm; 45-counterweight; 46-pressure distribution adjustment component; 47-micro pressure sensor; 51-pore water pressure sensor; 52-flow sensor; 53-control unit; 61-flushing device; 62-annular recoil pipe; 63-electromagnetic pulse valve. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "connection" should be understood in a broad sense. For example, they can refer to welding, bolting, or riveting; fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] Example:

[0024] like Figure 1 and Figure 2 As shown, this embodiment provides a soft soil foundation drainage consolidation system, including: a soft soil layer, a water-stop module, a support module, a drainage module and a gravity pressure module 4, the water-stop module is arranged in the soft soil layer to enclose the construction area, the support module includes a sand cushion layer and a steel structure support layer with avoidance holes, the drainage module includes a drainage well 11 and a drainage pipe network 13, the gravity pressure module 4 includes a stand 41, a mobile truss 42 and a pressure arm 43, and also includes: an intelligent monitoring feedback module, including a pore water pressure sensor 51 buried at different depths in the soft soil layer, a device A flow sensor 52 is placed in the drainage network 13, and a control unit 53 is integrated in the remote monitoring terminal. The control unit 53 is electrically connected to the driving component of the gravity pressurization module 4; an adaptive backwash module includes a flushing device 61 arranged in the drainage well 11. The flushing device 61 includes an annular backwash pipe 62 and an electromagnetic pulse valve 63. The annular backwash pipe 62 is arranged around the inner wall of the drainage well 11, and its side wall is provided with a backwash hole that is staggered at 45° with the seepage hole 12. The electromagnetic pulse valve 63 is connected to the main drainage pipe 14 of the drainage network 13.

[0025] In this embodiment, the soft soil layer, the target of the entire system, has a weak natural bearing capacity and requires drainage and consolidation to improve its strength and stability. The waterstop module utilizes a closed curtain structure consisting of multiple tightly arranged waterstop piles. During the initial construction phase, specialized pile foundation equipment is used to precisely drive the piles into the soft soil layer according to the pre-designed construction area outline. These piles interlock to form a solid waterproof barrier, effectively preventing groundwater infiltration from outside the construction area and ensuring that the drainage and consolidation process can proceed in a relatively isolated environment.

[0026] The sand cushion layer of the support module is laid on the surface of the soft soil layer. During construction, the sand material that meets the particle size requirements is evenly spread by machinery, and compacted in layers using compaction equipment to form a cushion layer of a certain thickness. The sand cushion layer has good water permeability and can assist in drainage. At the same time, it provides a relatively flat foundation with a certain load-bearing capacity for the steel structure support layer above. The steel structure support layer adopts a modular design. After the steel structure units with avoidance holes are prefabricated in the factory, they are transported to the construction site for assembly. The avoidance holes are set to reserve installation space for the drainage well 11, ensuring that the drainage well 11 can smoothly pass through the steel structure support layer and be inserted into the soft soil layer. The steel structure support layer has high strength and rigidity, can withstand the load applied by the gravity pressure module 4, and transfer the load evenly to the sand cushion layer and the soft soil layer.

[0027] The drainage well 11 of the drainage module adopts prefabricated concrete pipes. During the construction process, a hole that matches the diameter of the drainage well 11 is drilled in the soft soil layer by drilling equipment, and then the drainage well 11 is lowered into the hole section by section. Seepage holes 12 are pre-set on the well wall. The aperture and spacing of the seepage holes 12 are optimized to ensure that the water in the soft soil layer can penetrate into the drainage well 11 smoothly, and prevent soil particles from entering and blocking the drainage channel. The drainage network 13 is composed of drainage pipes of different diameters, which are connected into a network by means of sockets, welding, etc. The drainage network 13 is laid between the sand cushion layer and the steel structure support layer. The main drainage pipe 14 is connected to the external drainage system to transport the water collected in the drainage well 11 to the designated location. The frame 41 of the gravity pressurization module 4 is welded with high-strength steel, and the bottom is firmly connected to the foundation through embedded parts to ensure that the frame 41 remains stable throughout the construction process. The mobile truss 42 is mounted on a track atop the vertical frame 41 and is driven laterally by a motor, allowing the pressurizing arm 43 to apply pressure at various locations within the construction area. The pressurizing arm 43 consists of a retractable inner arm and an outer arm 44. The inner arm is hydraulically driven within the outer arm 44, and a mounting base for a counterweight 45 is installed at the bottom of the outer arm 44. Counterweights 45 can be added or removed as needed to adjust the pressure load applied by the pressurizing arm 43.

[0028] Before construction of the soft soil foundation, the pore-water pressure sensors 51 of the intelligent monitoring and feedback module are buried at varying depths in the soft soil using drilling equipment. Each sensor is equipped with a waterproof protective cover and a data transmission line, which is led out of the ground along a pre-arranged pipeline channel and connected to a data acquisition device. Flow sensors 52 are installed at key nodes in the drainage network 13. Using the principle of electromagnetic induction, they can monitor the flow rate within the drainage network 13 in real time. The control unit 53 is integrated into the server of the remote monitoring terminal and establishes a wireless connection with the pore-water pressure sensors 51, flow sensors 52, and the drive components of the gravity pressurization module 4, enabling real-time data transmission and remote control of commands.

[0029] During the prefabrication process of the drainage well 11, the annular backwash pipe 62 of the adaptive backwash module is pre-buried within the well wall, surrounding the inner wall of the drainage well 11. The annular backwash pipe 62 is made of corrosion-resistant PVC, and the backwash holes on the sidewall are drilled using specialized machining equipment. The backwash holes and the seepage holes 12 on the wall of the drainage well 11 are staggered at 45°. This design allows the water flow to impact the seepage holes 12 at the optimal angle during backwashing, effectively removing impurities clogged in the seepage holes 12. An electromagnetic pulse valve 63 is installed at the connection between the annular backwash pipe 62 and the main drainage pipe 14 of the drainage network 13. By controlling the opening and closing of the electromagnetic pulse valve 63, pulsed control of the backwash water flow is achieved.

[0030] The control unit 53 has a built-in depth pressure gradient algorithm. When the pore water pressure sensor 51 detects that the pressure difference at a depth of 10m exceeds 0.05MPa, it automatically adjusts the pressure application frequency of the pressurizing arm 43 to 8-12 times / hour and increases the loading of the counterweight block 45 by 10-20%.

[0031] In this embodiment, the depth pressure gradient algorithm built into the control unit 53 was developed based on extensive soft soil foundation drainage and consolidation engineering data and theoretical research results. The pore water pressure sensor 51 continuously monitors pore water pressure changes at different depths in the soft soil layer and transmits the data in real time to the control unit 53. When the pore water pressure difference at a depth of 10m exceeds a preset threshold, it indicates an abnormality in the soil drainage and consolidation state at that depth, potentially indicating problems such as poor drainage or uneven soil compression. At this point, the control unit 53 responds quickly by controlling the motor speed of the drive assembly and the pressure of the hydraulic system to adjust the pressure application frequency of the pressurizing arm 43 to an appropriate range, increasing the number of pressurization cycles applied to the soil in that area to accelerate the removal of moisture from the soil. Simultaneously, the load of the counterweight 45 is increased, further increasing the pressure load, prompting soil particles to rearrange and accelerating the soil consolidation process. During this adjustment process, the control unit 53 also continuously monitors the data feedback from the pore water pressure sensor 51 and dynamically fine-tunes the pressure parameters based on actual conditions to ensure a safe and efficient soil drainage and consolidation process.

[0032] The backwash pressure of the flushing device 61 is 0.3-0.5 MPa, and the duration of a single pulse is 5-10 seconds. It is triggered by the data of the flow sensor 52 and the backwash program is automatically started when the drainage volume decays by more than 20%.

[0033] In this embodiment, the flushing device 61 operates based on real-time monitoring of the drainage volume of the drainage network 13 by the flow sensor 52. The flow sensor 52 transmits the monitored drainage volume data in real time to the control unit 53, which analyzes and processes the data. When the drainage volume decreases by more than 20%, the control unit 53 determines that the seepage holes 12 of the drainage well 11 may be clogged and immediately sends a start command to the solenoid pulse valve 63. Upon receiving the command, the solenoid pulse valve 63 quickly opens, allowing pressurized water from the main drainage pipe 14 of the drainage network 13 to enter the annular backwash pipe 62 under pressure. Due to the instantaneous increase in pressure within the annular backwash pipe 62, the pressurized water is ejected from the backwash holes at a high pressure of 0.3-0.5 MPa, forming a pulsed water flow. This pulsed water flow generates a powerful impact force, flushing the seepage holes 12 on the wall of the drainage well 11, effectively removing soil particles and impurities that may be blocking the seepage holes 12. After a single pulse lasts for 5-10 seconds, the electromagnetic pulse valve 63 closes, pauses briefly, and then reopens for the next pulse backwash. This process repeats multiple times until the drainage volume returns to normal or near normal levels. During the backwash process, the control unit 53 monitors the data from the flow sensor 52 in real time and adjusts parameters such as the number of backwashes and pulse duration based on changes in drainage volume to achieve the optimal backwash effect and ensure smooth drainage of the drainage well 11.

[0034] The pressure distribution adjustment component 46 applies precise pressure. The pressurized vertical arm 43 also includes a pressure distribution adjustment component 46, which includes a flexible pressure pad arranged on the bottom surface of the outer arm 44 and a micro pressure sensor 47 distributed in the pad. The flexible pressure pad adopts shape memory alloy material and adjusts the local pressure intensity according to the instructions of the control unit 53.

[0035] In this embodiment, the pressure distribution adjustment component 46 is designed to achieve more accurate and uniform pressure on soft soil foundations. The flexible pressure pad fits tightly to the bottom surface of the outer sleeve arm 44 and is installed before construction through a special gluing process or mechanical fixing method. Shape memory alloy materials have unique properties and can change their shape and stiffness under different temperatures or currents. Multiple miniature pressure sensors 47 are evenly distributed in the pad. These sensors are small in size and high in precision. They can monitor the pressure distribution on the contact surface between the flexible pressure pad and the soil in real time and transmit the data to the control unit 53.

[0036] When the control unit 53 determines, based on data from the pore water pressure sensor 51 and other sensors, that a certain area of ​​the soft soil foundation requires adjustment of the applied pressure intensity, it sends a control command to the flexible pressure pad. By varying the current or temperature applied to the shape memory alloy material, it causes local deformation, thereby adjusting the contact area between the flexible pressure pad and the soil and the pressure distribution. For example, if it detects that the pore water pressure in a certain area is high and the drainage and consolidation effect is poor, the control unit 53 instructs the flexible pressure pad to deform at the corresponding location in that area, increasing the contact pressure with the soil and improving the applied pressure intensity in that area. For areas with lower pore water pressure and near-consolidation, the control unit 53 reduces the applied pressure intensity in that area to prevent damage to the soil caused by excessive pressure. Throughout the entire pressure application process, the micro pressure sensor 47 continuously monitors the pressure distribution and feeds the data back to the control unit 53. The control unit 53 makes real-time adjustments to the flexible pressure pad based on this feedback, ensuring that the soft soil foundation receives the most appropriate and effective pressure during the drainage and consolidation process, thereby improving the quality and efficiency of the foundation treatment.

[0037] A seepage monitoring pipe is provided inside the water-stop pile of the water-stop module. The seepage monitoring pipe has a built-in optical fiber sensor to monitor the hydraulic connection of the construction area boundary in real time. The data is transmitted to the control unit 53 for boundary correction.

[0038] In this embodiment, the seepage monitoring pipe is installed simultaneously during the construction of the water-stop piles. A groove for installing the seepage monitoring pipe is reserved on the inner side of each water-stop pile. After the seepage monitoring pipe is placed in the groove, it is filled and fixed with a special sealing material to ensure that the seepage monitoring pipe is tightly combined with the water-stop pile to prevent groundwater from seeping into the gap and affecting the monitoring effect. The optical fiber sensor in the seepage monitoring pipe works based on the principle of optical time domain reflection. When groundwater seepage occurs around the construction area, it will cause changes in the environment around the optical fiber, which will cause changes in the reflection, scattering and other characteristics of the optical signal. The optical fiber sensor converts the change of this optical signal into an electrical signal, and transmits the data to the control unit 53 through a dedicated data transmission line.

[0039] After receiving the data, the control unit 53 uses a professional data analysis algorithm to analyze and evaluate the hydraulic connection of the construction area boundary. If groundwater leakage is found, the control unit 53 will quickly formulate a boundary correction plan based on the location, flow rate and other information of the leakage. For example, for areas with less leakage, the control unit 53 may instruct to add grouting reinforcement measures near the leakage point, by injecting anti-seepage slurry into the soil to fill the gaps and improve the anti-seepage performance of the soil; for areas with more serious leakage, it may instruct to add additional water-stopping piles or adopt other more effective water-stopping measures to block the groundwater leakage channel and ensure that the drainage and consolidation work in the construction area can be carried out smoothly under good water-stopping conditions. At the same time, the control unit 53 will continue to monitor the data of the seepage monitoring pipe, evaluate and adjust the boundary correction effect, and ensure that the water-stopping module always plays a good water-stopping role.

[0040] In summary, through the collaborative work of multiple modules, the drainage and consolidation treatment of soft soil foundations has been made efficient and systematic; through the intelligent monitoring and feedback module to collect data and control it by AI, precise automatic control of the gravity pressurization module has been achieved; through the adaptive backwash module to trigger backwashing according to the drainage volume, automatic maintenance and smooth flow of the drainage channel have been achieved; through the pressure distribution adjustment component combined with AI instructions to adjust the pressure, the pressure distribution of soft soil foundation has been optimized and accurately treated; through real-time monitoring of the seepage monitoring pipe and correction of the boundary by AI, dynamic guarantee of the water-stopping effect in the construction area has been achieved.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A soft soil foundation drainage consolidation system, comprising a water-stop module, a support module, a drainage module and a gravity pressure module (4), wherein the water-stop module is arranged in a construction area and is characterized in that: Also includes: Support module, with sand cushion layer and steel structure support layer with avoidance holes, A drainage module having a drainage well (11) and a drainage pipe network (13), A gravity pressurizing module (4) comprises a stand (41), a movable truss (42) and a pressurizing arm (43); An intelligent monitoring feedback module comprises a pore water pressure sensor (51) buried at different depths, a flow sensor (52) arranged in a drainage pipe network (13), and a control unit (53) integrated in a remote monitoring terminal, wherein the control unit (53) is electrically connected to a driving component of the gravity pressurization module (4); The adaptive backwash module comprises a flushing device (61) arranged in a drainage well (11), wherein the flushing device (61) comprises an annular backwash pipe (62) and an electromagnetic pulse valve (63), wherein the annular backwash pipe (62) is arranged around the inner wall of the drainage well (11), and a backwash hole staggered at 45 degrees with the water seepage hole (12) is opened on its side wall, and the electromagnetic pulse valve (63) is connected to the main drainage pipe (14) of the drainage network (13).

2. The soft soil foundation drainage and consolidation system according to claim 1, characterized in that: The control unit (53) has a built-in depth pressure gradient algorithm. When the pore water pressure sensor (51) detects that the pressure difference at a depth of 10m exceeds 0.05MPa, the pressure application frequency of the pressure arm (43) is automatically adjusted to 8-12 times / hour, and the loading amount of the counterweight block (45) is increased by 10-20%.

3. The soft soil foundation drainage and consolidation system according to claim 2, characterized in that: The backwash pressure of the flushing device (61) is 0.3-0.5 MPa, and the duration of a single pulse is 5-10 seconds. It is triggered by the data of the flow sensor (52) and automatically starts the backwash program when the drainage volume decays by more than 20%.

4. The soft soil foundation drainage and consolidation system according to claim 3, characterized in that: The pressurizing arm (43) has a pressure distribution adjustment component (46), and the pressurizing arm (43) has a flexible pressure pad arranged on the bottom surface of the outer arm (44) and a micro pressure sensor (47) distributed in the pad. The flexible pressure pad adopts a shape memory alloy material and adjusts the local pressure intensity according to the instruction of the control unit (53).

5. The soft soil foundation drainage and consolidation system according to claim 4, characterized in that: A seepage monitoring pipe is provided inside the water-stop pile of the water-stop module. The seepage monitoring pipe has a built-in optical fiber sensor to monitor the hydraulic connection of the construction area boundary in real time, and the data is transmitted to the control unit (53) for boundary correction.

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