Indoor intelligent pile type embankment grouting simulation device and simulation method

Abstract

The invention discloses an indoor intelligent pile type embankment grouting simulation device which is characterized in that an intelligent control system is in signal connection with a slurry preparation system and a grouting system, so that efficient connection and intelligent management of equipment in the slurry preparation system and the grouting system can be realized; a cement bin of the slurry preparation system is filled with a powdery cementing material; the powdery cementing material and water are stirred and then pumped into a grouting system; the pile body of the grouting system, the soft soil foundation, the embankment filling soil and the monitoring element are all located in the model groove; a plurality of pile bodies are uniformly distributed in the model groove, embankment filling soil is distributed at the tops of the pile bodies, soft soil foundations are filled between the adjacent pile bodies, the bottoms of the grouting pipelines are located in the soft soil foundations, the monitoring elements are distributed in the embankment filling soil, the grouting system is used for grouting after a soil arching effect is formed in the model groove, the powdery cementing material is determined again, and a next group of tests is carried out. The device integrates an intelligent control system, a slurrying system and a grouting system, and can accurately simulate the influence rule of different grouting processes on the soil arch effect of the pile-supported embankment.

Description

Technical Field

[0001] The invention relates to the treatment of soft soil foundation of expressway, in particular to an indoor intelligent pile-supported embankment grouting simulation device and a simulation method. Background Art

[0002] In the process of engineering construction, it is inevitable to encounter adverse geological conditions such as silt and silty clay. These special soils pose a major challenge to highway construction. In order to ensure the quality of highway projects and long-term operational safety, scientific and effective foundation treatment technologies must be adopted during the construction process, such as traditional replacement and compaction methods. Advanced technologies such as chemical improvement and vacuum preloading may also be involved. However, the above construction methods all have problems such as high construction costs and great construction difficulty.

[0003] Pile foundation is a classic soft soil foundation treatment technology, which refers to the arrangement of rigid or semi-rigid piles in soft soil foundation to support embankment load. In this structure, due to the difference in stiffness between the pile and the soil between the piles, differential settlement will occur between the pile and the soil under the overlying embankment load, resulting in shear stress in the embankment fill, forming a "soil arch" phenomenon of stress redistribution, so that most of the embankment load is transferred to the pile body, while the load borne by the soil between the piles is relatively small, thereby effectively controlling the overall settlement of the embankment. However, in actual engineering, pile-supported embankments are often affected by complex environmental factors, such as rising groundwater levels, continuous rainfall, and dynamic loads from trains. These factors may significantly aggravate the settlement difference between the pile foundation and the surrounding soil, threatening driving safety. Based on the above embankment diseases, the use of grouting technology to reinforce the area with large settlement in the soft soil foundation can effectively control road settlement and unevenness.

[0004] In field tests, it is difficult to obtain relatively complete research results due to the lack of corresponding test conditions and the inability to control the required test variables. Therefore, it is urgent to develop a pile-supported embankment grouting simulation test device to meet the needs of experimental research. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an indoor intelligent pile-supported embankment grouting simulation device and a simulation method in view of the deficiencies of the above-mentioned prior art. The indoor intelligent pile-supported embankment grouting simulation device and the simulation method integrate an intelligent control system, a slurry making system and a grouting system, and can accurately simulate the influence of different grouting processes on the soil arch effect of pile-supported embankments.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: An indoor intelligent pile-supported embankment grouting simulation device comprises an intelligent control system, a slurry preparation system and a grouting system; the intelligent control system is connected with the slurry preparation system and the grouting system by signal, and can realize efficient connection and intelligent management of various equipment in the slurry preparation system and the grouting system; the slurry preparation system comprises a cement silo, a powdered cementitious material conveying pipeline, an electric fan, a screw conveyor, a mixer, a water tank and a high-pressure pump; the cement silo is filled with powdered cementitious material; the powdered cementitious material conveying pipeline is horizontally arranged and connected to the bottom of the cement silo; the electric fan is connected to the left end of the powdered cementitious material conveying pipeline; the screw conveyor is connected to the powdered cementitious material conveying pipeline and is arranged below the powdered cementitious material conveying pipeline; the mixer is arranged on the right side of the screw conveyor and is connected to the screw conveyor The mixer is connected to the water tank; the water tank is located above the mixer and is connected to the mixer through a water outlet pipe; the high-pressure pump is connected to the mixer and is used to transport the slurry in the mixer to the grouting system; the grouting system includes a slurry pumping pipeline, a grouting pipeline, a model tank, a pile body, a soft soil foundation, an embankment fill and a monitoring element, and the pile body, the soft soil foundation, the embankment fill and the monitoring element are all located in the model tank; the slurry pumping pipeline is connected to the high-pressure pump; the grouting pipeline is connected below the slurry pumping pipeline; the model tank is arranged below the slurry pumping pipeline, the model tank is connected to the grouting pipeline, a number of pile bodies are evenly arranged in the model tank, the embankment fill is arranged on the top of the pile body, the soft soil foundation is filled between adjacent pile bodies, the bottom of the grouting pipeline is located in the soft soil foundation, and the monitoring element is arranged in the embankment fill; a drain valve is provided at the bottom of the model tank.

[0007] Preferably, the intelligent control system includes a high-performance computer terminal, an industrial-grade network interface card, a smart meter and multiple STEP expansion modules, which establish a stable communication link through the RS485 bus; the multiple STEP expansion modules include a valve STEP expansion module, a motor STEP expansion module, a sensor STEP expansion module and a monitoring component STEP expansion module; each STEP expansion module realizes efficient connection and intelligent management of each equipment in the slurry preparation system and the grouting system through the MODBUS protocol.

[0008] Preferably, there are multiple cement silos, each of which is filled with different types of powdered cementitious materials, and pneumatic knife gate valves are provided at both ends of the connection between the powdered cementitious material conveying pipeline and each cement silo, and pneumatic knife gate valves are provided at the connection between the powdered cementitious material conveying pipeline and the screw conveyor; an electric butterfly valve is provided at the discharge port at the bottom of each cement silo, and an electronic weighing scale is provided under each cement silo, and pneumatic knife gate valves are provided on the left and right sides of the electronic weighing scale; circular notches are provided on the left and right sides of the electronic weighing scale, and the switch state and opening degree of the circular notches are controlled by the pneumatic knife gate valves at the left and right ends of the cement silo connection; multiple wind pollution particle monitoring devices are provided on the powdered cementitious material conveying pipeline.

[0009] Preferably, the mixer includes a high-speed mixer and a flexible mixer; the high-speed mixer is connected to the water tank through a water outlet pipe, and includes a mixer bracket, a stirring device, a discharge device and a dust removal device; the mixer bracket is arranged on the ground; the stirring device is located in the high-speed mixer and is driven by a stirring motor; the discharge device is located at the bottom of the high-speed mixer, and an electric ball valve is provided on the discharge device; the dust removal device is located on the top cover of the high-speed mixer; the flexible mixer is connected to the high-speed mixer through a slurry conveying pipeline, and an electric ball valve is provided on the slurry conveying pipeline; a flexible mixer discharge device is provided at the bottom of the flexible mixer, and an electric ball valve is provided on the flexible mixer discharge device; a stopwatch is provided on the top of the flexible mixer; the flexible mixer is connected to a high-pressure pump.

[0010] Preferably, the water outlet pipe includes a first mist water outlet pipe, a second mist water outlet pipe and a conventional water outlet pipe; the first mist water outlet pipe, the second mist water outlet pipe and the conventional water outlet pipe are all provided with electric ball valves; the first mist water outlet pipe, the second mist water outlet pipe and the conventional water outlet pipe are all connected to the top of the mixer, and mist nozzles are provided at the water outlets of the first mist water outlet pipe and the second mist water outlet pipe.

[0011] Preferably, the left side of the slurry pumping pipeline is arranged from low to high, and the right side is arranged horizontally, and a pressure gauge is provided on the slurry pumping pipeline; a concrete pier is provided at the lower left side of the slurry pumping pipeline, and the slurry pumping pipeline is connected to the concrete pier through an arch fixing device; it also includes a transport pipeline support, which is arranged on the outside of the model trough, located at the lower right side of the slurry pumping pipeline, and is used to fix the grouting pipeline; the grouting pipeline is connected to the transport pipeline support through a pipeline fixing device, the grouting pipeline is connected to the model trough through the pipeline fixing device, and a flow meter is provided on the grouting pipeline.

[0012] Preferably, the grouting pipeline includes an upper slurry delivery pipeline, a middle slurry delivery pipeline and a bottom grouting pipeline from top to bottom; the top of the upper slurry delivery pipeline is connected to the slurry pumping pipeline, and the bottom is connected to the transport pipeline support through a pipeline fixing device; the top of the middle slurry delivery pipeline is connected to the upper slurry delivery pipeline, and the bottom is connected to the model tank through a pipeline fixing device; the top of the bottom grouting pipeline is connected to the middle slurry delivery pipeline, and the bottom is located in the soft soil foundation, and the bottom grouting pipeline is one or both of a splitting grouting pipeline and a compaction grouting pipeline of different lengths.

[0013] Preferably, the monitoring element includes a plurality of earth pressure cells and multi-point displacement meters, and the plurality of earth pressure cells and multi-point displacement meters are uniformly arranged in the transverse and longitudinal directions of the embankment fill.

[0014] Preferably, the pipeline fixing device includes two concave rectangular iron blocks, the concave parts of the two concave rectangular iron blocks are arranged relative to each other to form a cylindrical through hole, the two concave rectangular iron blocks are provided with through holes in the transverse and longitudinal directions, and the two concave rectangular iron blocks are connected by transversely arranged bolts; bolt holes are provided at the connection between the transport pipeline support and the pipeline fixing device, and the pipeline fixing device is connected to the transport pipeline support by longitudinally arranged bolts; bolt holes are provided at the connection between the model groove and the pipeline fixing device, and the pipeline fixing device is connected to the model groove by longitudinally arranged bolts.

[0015] An indoor intelligent pile-supported embankment grouting simulation method comprises the following steps: The first step is to take samples on site and obtain parameters: take samples of the embankment fill and soft soil foundation at the construction site and measure and obtain relevant parameters; the second step is to make a model groove: place piles, soft soil foundation, embankment fill and monitoring components in the model groove, and then inject the soft soil foundation into the model groove after being fully soaked in water. The drainage valve is opened, and the embankment fill is drained and consolidated under the self-weight of the embankment fill, thereby generating a soil arch effect; the third step is to mix the powdered cementitious material with water: the powdered cementitious material dropped from the cement silo is blown to the screw by an electric fan. The screw conveyor conveys the powdered cementitious material to the mixer, and the water in the water tank is injected into the mixer to mix with the powdered cementitious material; the fourth step is grouting into the soft soil foundation in the model tank: the high-pressure pump is turned on to inject the slurry in the mixer into the grouting pipe through the slurry pumping pipe, and then injected into the soft soil foundation in the model tank; the fifth step is to clean the model tank, cement silo, various pipes and mixer, re-determine the powdered cementitious material, and carry out the next set of tests; the intelligent control system realizes efficient connection and intelligent management of the above equipment.

[0016] The present invention has the following beneficial effects: Equipped with an advanced intelligent control system, the entire test system can be monitored and managed in real time through a computer terminal. The system significantly reduces human resource costs and effectively avoids a series of problems caused by manual operation, such as valve opening delays, untimely data collection, and inability to detect and handle equipment failures in a timely manner. This intelligent management has greatly improved the degree of automation of the test process and the accuracy of data collection, thereby significantly enhancing the accuracy and reliability of the test results.

[0017] Equipped with multiple cement silos and multiple electronic weighing scales, the device can study the influence of single or composite cementitious materials on the grouting effect. At the same time, the device integrates advanced electric fans, pneumatic knife gate valves and screw conveyors, which can achieve accurate metering and efficient transportation of cementitious materials through collaborative work. This design can not only significantly improve the reliability of test results and effectively avoid test deviations caused by metering errors, but also optimize the material transportation process and minimize pollution to the surrounding air environment.

[0018] Since three water outlet systems with different functions are arranged at the bottom of the water tank, including two atomizing water outlet pipes and one conventional water outlet pipe, the ends of these water outlet pipes are precisely connected to the top of the high-speed mixer, forming an efficient hydration system. The use of gaseous water and liquid water can significantly improve the hydration efficiency and uniformity of powdered gelling materials, and effectively avoid test errors caused by insufficient hydration. In addition, a flexible mixer is configured on the right side of the high-speed mixer. The design of this dual mixing system fully considers the segregation and solidification problems that may occur in the slurry during long-term static standing. The flexible mixer can effectively maintain the homogeneity and fluidity of the slurry through continuous low-speed stirring, ensuring the stability and representativeness of the sample during long-term testing.

[0019] The test device is equipped with multiple pipe fixing devices, concrete piers and transport pipe supports. This composite fixing scheme can effectively suppress the pipe vibration that may occur during the high-pressure grouting process by providing stable support at key nodes. This design not only significantly improves the structural stability of the test system, but also minimizes the risk of pipe damage caused by vibration.

[0020] This test device is equipped with two types of grouting pipes, namely splitting grouting pipes and compaction grouting pipes, both of which are arranged at different heights in the soft soil area below the embankment, forming a multi-level, all-round grouting network. This design aims to systematically study the influence of multiple key parameters on embankment performance, including but not limited to grouting method, grouting location, grouting parameters and selection of grouting materials.

[0021] The above test device can be used to deeply analyze the following scientific issues: ① the formation and evolution of the soil arch effect inside the embankment; ② the dynamic change of the position of the equal sinking surface; ③ the change mechanism of the shear strength of the soil; ④ the diffusion radius of the slurry and its influencing factors. This multivariable and multi-objective test design can provide researchers with a comprehensive and in-depth research platform, help reveal the complex mechanism of grouting technology in embankment reinforcement, and provide an important scientific basis for related theoretical research and engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an indoor intelligent pile-supported embankment grouting simulation device of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the intelligent control system of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the slurry preparation system of the present invention.

[0025] Figure 4 It is a structural schematic diagram of the grouting system of the present invention.

[0026] Figure 5 It is a structural schematic diagram of a splitting grouting pipeline and a compacting grouting pipeline in a model groove of the present invention.

[0027] Figure 6 It is a structural schematic diagram of a drain valve and tempered glass connected to a model groove of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the grouting pipeline connection of the grouting system of the present invention.

[0029] Figure 8 It is a front view of the arrangement scheme of the monitoring element of the present invention.

[0030] Fig. 9 It is a top view of the arrangement scheme of the monitoring elements of the present invention.

[0031] Among them are: 1. Intelligent control system; 11. High-performance computer terminal; 12. Industrial-grade network interface card; 13. Smart meter; 14. Valve STEP expansion module; 15. Motor STEP expansion module; 16. Sensor STEP expansion module; 17. Monitoring original STEP expansion module; 18. RS485 bus; 2. Slurry preparation system; 21. Cement silo; 211. Electric butterfly valve; 212. Electronic weighing scale; 22. Powdered gelling material delivery pipeline; 221. Pneumatic knife gate valve; 222. Wind pollution particle monitoring equipment; 23. Electric fan; 24. Screw conveyor; 25. Mixer; 251. High-speed mixer; 2511. Mixer support; 2512. Mixing device; 2513. Mixing motor; 2514. High-speed mixer discharge device; 2515. Dust removal device; 252. Flexible mixer; 2521. Slurry delivery pipeline; 2522. Flexible mixer discharge device; 2523. Stopwatch; 26. Water tank; 261. First mist water outlet pipe; 262. Second mist water outlet pipe; 263. Conventional water outlet pipe; 27. High-pressure pump; 28. Electric ball valve; 3. Grouting system; 31. Slurry pumping pipeline; 311. Pressure gauge; 312. Concrete pier; 313. Arch fixing device; 32. Grouting pipeline; 321. Flow meter; 322. Upper slurry delivery pipeline; 323. Middle slurry delivery pipeline; 324. Bottom grouting pipeline; 3241. Splitting grouting pipeline; 3242. Compacting grouting pipeline; 33. Model tank; 331. Drain valve; 332. Tempered glass; 34. Pile; 35. Soft soil foundation; 36. Embankment fill; 37. Monitoring components; 371. Earth pressure cell; 372. Multi-point displacement meter; 38. Transport pipe support; 39. Pipeline fixing device. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0033] like Figures 1 to 9 As shown, an indoor intelligent pile-supported embankment grouting simulation device includes an intelligent control system 1, a slurry preparation system 2 and a grouting system 3.

[0034] The intelligent control system 1 is connected with the slurry preparation system 2 and the grouting system 3 by signals, and can realize efficient connection, intelligent management, real-time remote monitoring and precise control of each device in the slurry preparation system 2 and the grouting system 3; the intelligent control system 1 includes a high-performance computer terminal 11, an industrial-grade network interface card 12, an intelligent meter 13 and multiple STEP expansion modules from top to bottom, and the high-performance computer terminal 11, the industrial-grade network interface card 12, the intelligent meter 13 and multiple STEP expansion modules all establish a stable communication link through the RS485 bus 18; multiple STEP expansion modules include a valve STEP expansion module 14, a motor STEP expansion module 15, a sensor STEP expansion module 16 and a monitoring component STEP expansion module 17; the system core adopts An industrial-grade network interface card 12 is used, and the system architecture adopts a modular design. Each STEP expansion module realizes efficient connection and intelligent management of various equipment in the slurry preparation system 2 and the grouting system 3 through the MODBUS protocol. Among them, the valve STEP expansion module 14 is responsible for controlling the electric butterfly valve 211, the pneumatic knife gate valve 221 and the electric ball valve 28; the motor STEP expansion module 15 is responsible for controlling the electric fan 23, the screw conveyor 24, the mixer 25 and the high-pressure pump 27; the sensor STEP expansion module 16 is responsible for controlling the electronic metering scale 212, the wind pollution particle monitoring equipment 222, the stopwatch 2523, the pressure gauge 311 and the flow meter 321; the monitoring component STEP expansion module 17 is responsible for controlling the soil pressure box 371 and the multi-point displacement meter 372.

[0035] The slurry preparation system 2 includes a cement silo 21 , a powdered cementitious material conveying pipeline 22 , an electric fan 23 , a screw conveyor 24 , a mixer 25 , a water tank 26 and a high-pressure pump 27 .

[0036] The cement silo 21 is filled with powdered cementitious materials; there are multiple cement silos 21, and each cement silo 21 is filled with different types of powdered cementitious materials.

[0037] The powdered cementitious material conveying pipeline 22 is arranged horizontally and connected to the bottom of the cement silo 21; pneumatic knife gate valves 221 are provided at both ends of the connection between the powdered cementitious material conveying pipeline 22 and each cement silo 21, and pneumatic knife gate valves 221 are provided at the connection between the powdered cementitious material conveying pipeline 22 and the screw conveyor 24; an electric butterfly valve 211 is provided at the discharge port at the bottom of each cement silo 21, and the electric butterfly valve 211 controls the discharge flow; an electronic metering scale 212 is connected below the discharge port of each cement silo 21, and pneumatic knife gate valves 221 are provided on the left and right sides of the electronic metering scale 212, and circular notches are provided on the left and right sides of the electronic metering scale 212, and the powdered cementitious material conveying pipeline 22 is connected to the circular notch, and the switch state and opening degree of the circular notch are controlled by the pneumatic knife gate valve 221 provided on the powdered cementitious material conveying pipeline 22. When the equipment starts to run, the cementitious material inside the cement silo 21 is discharged to the electronic weighing scale 212 through the electric butterfly valve 211. At this time, the pneumatic knife gate valves 221 on the left and right sides of the electronic weighing scale 212 are both in a closed state. When the reading of the electronic weighing scale 212 reaches the test amount, the pneumatic knife gate valve 221 is opened, and the cementitious material inside the electronic weighing scale 212 is blown into the screw conveyor 24 by wind power, thereby achieving accurate management of the material discharge amount and efficient transportation. A plurality of wind pollution particle monitoring devices 222 are provided on the powdered cementitious material delivery pipeline 22, which are used to monitor whether all the powdered cementitious material in the powdered cementitious material delivery pipeline 22 is delivered to the screw conveyor 24.

[0038] The electric fan 23 is connected to the left end of the powdered cementitious material conveying pipeline 22; the directional airflow generated by the electric fan 23 serves as a driving force, which can convey the powdered cementitious material at the bottom of the cement silo 21 to the downstream screw conveyor 24 in the form of a suspended flow, and cooperate with each pneumatic knife gate valve 221 to achieve efficient transportation of single or composite powdered cementitious materials.

[0039] The screw conveyor 24 is connected to the powdered gelling material conveying pipeline 22 and is disposed below the powdered gelling material conveying pipeline 22 ; the screw conveyor 24 drives the powdered gelling material to enter the mixer 25 .

[0040] The mixer 25 is disposed on the right side of the screw conveyor 24 and is connected to the screw conveyor 24 ; the mixer 25 includes a high-speed mixer 251 and a flexible mixer 252 .

[0041] The water tank 26 is located above the mixer 25 and is connected to the mixer 25 through a water outlet pipe; specifically, the high-speed mixer 251 is connected to the screw conveyor 24, and the high-speed mixer 251 is connected to the water tank 26 through a water outlet pipe, including a mixer bracket 2511, a stirring device 2512, a stirring motor 2513, a high-speed mixer discharge device 2514 and a dust removal device 2515; the mixer bracket 2511 is set on the ground; the stirring device 2512 is located in the high-speed mixer 251 and is driven by the stirring motor 2513; the discharge device is located at the bottom of the high-speed mixer 251, and an electric ball valve 28 is provided on the high-speed mixer discharge device 2514; the dust removal device 2515 is located on the top cover of the high-speed mixer 251.

[0042] Preferably, the water outlet pipe includes a first mist water outlet pipe 261, a second mist water outlet pipe 262 and a conventional water outlet pipe 263; the first mist water outlet pipe 261, the second mist water outlet pipe 262 and the conventional water outlet pipe 263 are all provided with an electric ball valve 28; the ends of the first mist water outlet pipe 261, the second mist water outlet pipe 262 and the conventional water outlet pipe 263 are all connected to the top of the high-speed mixer 251, and mist nozzles are provided at the water outlets of the first mist water outlet pipe 261 and the second mist water outlet pipe 262. The synergistic effect of gaseous water and liquid water ensures that the gelling material inside the high-speed mixer 251 is completely hydrated. The coordinated use of gaseous water and liquid water can significantly improve the hydration efficiency and uniformity of the powdered gelling material, and effectively avoid test errors caused by insufficient hydration.

[0043] The high-pressure pump 27 is connected to the mixer 25 and is used to transport the slurry in the mixer 25 to the grouting system 3. Specifically, the flexible mixer 252 is connected to the high-speed mixer 251 through the slurry delivery pipeline 2521 and is arranged on the right side of the high-speed mixer 251. The stirring speed of the flexible mixer 252 is lower than that of the high-speed mixer 251, but the stirring time is much longer than that of the high-speed mixer 251. The flexible mixer 252 can effectively maintain the homogeneity and fluidity of the slurry through continuous low-speed stirring, which is used to ensure the stability and representativeness of the sample during the long-term test. An electric ball valve 28 is provided on the slurry delivery pipeline 2521; a flexible mixer discharge device 2522 is provided at the bottom of the flexible mixer 252, and an electric ball valve 28 is provided on the flexible mixer discharge device 2522; a stopwatch 2523 is provided on the top of the flexible mixer 252; the flexible mixer 252 is connected to the high-pressure pump 27, and the high-pressure pump 27 is used to pump the slurry that has been stirred evenly by the flexible mixer 252 into the inside of the model tank 33.

[0044] The grouting system 3 includes a slurry pumping pipeline 31, a grouting pipeline 32, a model groove 33, a pile body 34, a soft soil foundation 35, an embankment fill 36 and a monitoring element 37. The pile body 34, the soft soil foundation 35, the embankment fill 36 and the monitoring element 37 are all located in the model groove 33. The grouting system 3 is used to analyze the changing law of the soil arch effect of the pile-supported embankment before and after grouting.

[0045] The slurry pumping pipeline 31 is connected to the high-pressure pump 27; the left side of the slurry pumping pipeline 31 is arranged from low to high, and the right side is arranged horizontally. A pressure gauge 311 is provided on the slurry pumping pipeline 31, and the intelligent control system 1 can adjust the grouting pressure in real time according to the pressure gauge 311; concrete piers 312 are provided at the lower left side of the slurry pumping pipeline 31, and are arranged in a stepped manner. A circular groove is provided on the top of each concrete pier 312 for precise positioning and placement of the pipeline. In order to further improve the stability and reliability of the system, the slurry pumping pipeline 31 is connected to the concrete pier 312 through an arch fixing device 313, and the arch fixing device 313 is anchored to the concrete pier 312 through high-strength bolts to form an integrated rigid support system.

[0046] The grouting pipeline 32 is connected to the bottom of the slurry pumping pipeline 31; it also includes a transport pipeline support 38 made of stainless steel material, which is arranged outside the model tank 33 and below the right side of the slurry pumping pipeline 31, and is used to fix the grouting pipeline 32; the bottom of the transport pipeline support 38 is anchored to the ground by bolts to prevent the pipeline from being damaged by the large vibration generated when the high-pressure pump 27 is grouting. The grouting pipeline 32 is connected to the transport pipeline support 38 through a pipeline fixing device 39, and the grouting pipeline 32 is connected to the model tank 33 through a pipeline fixing device 39. A flow meter 321 is provided on the grouting pipeline 32, and the intelligent control system 1 can adjust the grouting flow rate in real time according to the flow meter 321.

[0047] The grouting pipeline 32 includes an upper slurry delivery pipeline 322, a middle slurry delivery pipeline 323 and a bottom grouting pipeline 324 from top to bottom. The top of the upper slurry delivery pipeline 322 is threadedly connected to the slurry pumping pipeline 31, and the bottom is connected to the transport pipeline support 38 through a pipeline fixing device 39. The top of the middle slurry delivery pipeline 323 is threadedly connected to the upper slurry delivery pipeline 322, and the bottom is connected to the model tank 33 through a pipeline fixing device 39. The middle slurry delivery pipeline 323 includes a pipeline and a pipeline end connection device. The pipeline end connection device is engraved with internal threads, and the lower part of the pipeline is engraved with external threads, which are used to anchor and connect the upper slurry delivery pipeline 322 and the bottom grouting pipeline 324. The top of the bottom grouting pipeline 324 is threadedly connected to the middle slurry delivery pipeline 323, and the bottom is located in the soft soil foundation 35. The bottom grouting pipeline 324 is one or two of a splitting grouting pipeline 3241 and a compaction grouting pipeline 3242 of different lengths. During the grouting process, the splitting of the grouting pipe 3241 can cause the slurry to apply additional compressive stress to the surrounding strata at the pipe mouth, causing shear cracks in the soil, and the slurry penetrates from the lower strength area to the higher strength area along the cracks, and finally forms a mesh or skeleton-like consolidation structure in the soil. In contrast, the slurry entering the compaction grouting pipe 3242 will form a slurry bag at the grouting point, and exert compression force on the surrounding soil through the diffusion of the slurry, so that the slurry completely replaces the original soil within the grouting range. This experimental device can be used to compare and analyze the effects of two different grouting methods on the reinforcement effect of soft clay, the degree of soil arch effect inside the embankment, and the differential settlement between piles and soil. In addition, by adjusting the length of the grouting pipe 324, the influence of different grouting depths on the soil arch effect of pile-supported embankments can be further explored.

[0048] The pipeline fixing device 39 includes two concave rectangular iron blocks, the concave parts of the two concave rectangular iron blocks are arranged relative to each other to form a cylindrical through hole for passing the pipeline, and the two concave rectangular iron blocks are provided with through holes in the transverse and longitudinal directions. The two concave rectangular iron blocks are connected by transversely arranged bolts for clamping the grouting pipeline 32; bolt holes and pipeline holes are provided at the connection between the transport pipeline support 38 and the pipeline fixing device 39, the pipeline fixing device 39 is connected to the transport pipeline support 38 by longitudinally arranged bolts, and the pipeline hole is for the grouting pipeline 32 to pass through; bolt holes and pipeline holes are provided at the connection between the model groove 33 and the pipeline fixing device 39, the pipeline fixing device 39 is connected to the model groove 33 by longitudinally arranged bolts, and the pipeline hole is for the grouting pipeline 32 to pass through.

[0049] The model tank 33 is arranged below the slurry pumping pipeline 31. The model tank 33 is connected to the grouting pipeline 32. A number of pile bodies 34 are evenly arranged in the model tank 33. The top of the pile bodies 34 is arranged with embankment fill 36. A soft soil foundation 35 is filled between adjacent pile bodies 34. The bottom of the grouting pipeline 32 is located in the soft soil foundation 35. The monitoring element 37 is arranged in the embankment fill 36. The monitoring element 37 includes a plurality of earth pressure boxes 371 and a multi-point displacement meter 372. The plurality of earth pressure boxes 371 and the multi-point displacement meter 372 are evenly arranged along the transverse and longitudinal direction of the embankment fill 36 to monitor the stress and deformation of the embankment fill 36 in the model tank 33 before and after grouting. A piece of tempered glass 332 is installed in front of the model tank 33 to observe the settlement of the embankment fill 36. A drainage valve 331 is provided at the bottom of the model tank 33 to drain and consolidate the embankment fill 36 under the self-weight of the embankment fill 36.

[0050] An indoor intelligent embankment grouting simulation method comprises the following steps: The first step is to take samples on site and obtain parameters: take samples on site for the embankment fill 36 and the soft soil foundation 35 at the construction site and measure and obtain relevant parameters; take samples on site for the embankment fill 36 and the soft soil under the embankment at the construction site. The soft soil under the embankment is the soft soil foundation 35. After taking the samples back, the soft soil under the embankment is dried and crushed to ensure the authenticity of the test. Carry out particle classification test, optimum moisture content determination test, maximum and minimum dry density test and direct shear test on the embankment fill 36 to obtain the particle grading, optimum moisture content, maximum and minimum dry density and shear strength parameters of the embankment fill 36; carry out particle classification test, liquid and plastic limit test, optimum moisture content test, maximum and minimum dry density test and direct shear test on the soft soil under the embankment to obtain the particle grading, liquid and plastic limit index, optimum moisture content, maximum and minimum dry density, internal friction angle and cohesion parameters of the soft soil.

[0051] The second step is to make a model groove 33: select a typical area of ​​the construction site (such as the center line of the road) and make a model groove 33 at a 1:1 ratio, and install a piece of tempered glass 332 in front of the model groove 33 to observe the settlement of the embankment. Place the pile body 34, soft soil foundation 35, embankment fill 36 and monitoring original 37 in the model groove 33. After the model groove 33 is made, use the hoisting equipment to lift the concrete pile body 34 to the specified position in the model groove 33. The pile body size, pile spacing and arrangement method must be consistent with the actual working conditions on site, and the distance between the pile edge and the model box must be controlled to be no less than 10 cm. The crushed soft soil is fully mixed with a predetermined amount of water in a mixer 25 to ensure that the soil is fully immersed in water. The soil is allowed to soak in water for a period of time to ensure that all pores in the soil are filled with water. The moisture content of the soil is measured using a soil moisture sensor. If the measured value is close to or reaches a saturated state, it indicates that the soil is completely saturated. The soft soil foundation 35 is fully immersed in water and then injected into the model groove 33. The total filling mass of the soft soil foundation 35 is determined according to the maximum dry density of the soft soil foundation 35. After the soft soil foundation 35 is filled to the same level as the pile cap, the grouting pipe 32 is inserted into the soft soil foundation 35 in the soft soil area in the middle of the four piles. The insertion depth of each grouting pipe 32 is determined according to the scale value on the surface of the grouting pipe 32 and the filling depth of the soft soil foundation 35. The embankment fill 36 is filled into the model groove 33 by layered filling method and compacted by manual tamping. A layer of colored sand is laid on one side of the plexiglass for each layer to observe the settlement of the embankment fill 36. Earth pressure boxes 371 are installed on the piles, at the centers of four piles and two piles, and multi-point displacement meters 372 are installed on the piles and at the centers of two piles to analyze the influence of different grouting parameters on the soil arch effect of the embankment fill 36. After the filling is completed, the cement stabilized gravel base is filled in turn. After the paving is completed, manual leveling is carried out in time and vibration leveling is carried out using a compactor. The drainage valve 331 is opened to drain and consolidate the embankment fill 36 under the action of its own weight, thereby generating a soil arch effect.

[0052] The third step is to mix the powdered cementitious material with water: the type of powdered cementitious material used in the test is determined according to the preliminary test plan, and each powdered cementitious material is blown into the corresponding cement silo 21 through a cement truck. According to the required type of powdered cementitious material, the electric butterfly valve 211 at the bottom of the cement silo 21 is opened through the high-performance computer terminal 11, so that the powdered cementitious material inside the cement silo 21 enters the electronic weighing scale 212. When the reading of the weighing scale reaches the test set amount, the electric fan 23 and the pneumatic knife gate valve 221 are turned on through the operation interface, and the powdered cementitious material is blown into the screw conveyor 24 by wind power. The powdered cementitious material in the cement silo 21 falls into the electronic weighing scale 212 and is blown to the screw conveyor 24 by the electric fan 23. The screw conveyor 24 conveys the powdered cementitious material to the mixer 25. According to the wind pollution particle monitoring device 222, it is determined whether the electric fan 23 blows all the powdered cementitious material in the powdered cementitious material conveying pipeline 22 into the screw conveyor 24. According to the preliminary test plan, the test water volume is determined and injected into the water tank 26. The water in the water tank 26 is injected into the mixer 25 to mix with the powdered gelling material. Preferably, the electric ball valve 28 of the three water outlet pipes at the bottom of the screw conveyor 24 and the water tank 26 is opened through the computer terminal to fully mix the powdered gelling material with the gaseous water and the liquid water in the high-speed mixer 251. A dust removal device 2515 is installed on the top of the high-speed mixer 251 to ensure that the powdered gelling material will not pollute the air environment. A discharge device is installed at the bottom of the high-speed mixer 251. When the high-speed mixer 251 fails, all the slurry in the machine can be discharged for easy maintenance. When the slurry inside the high-speed mixer 251 is evenly stirred, the electric ball valve 28 is opened to transport the evenly stirred slurry to the flexible mixer 252 for secondary stirring. The main function of the flexible mixer 252 is to ensure that the slurry will not be separated, settled, etc. under different grouting time conditions, and always maintain a uniform state.

[0053] The fourth step is to inject grout into the soft soil foundation 35 of the model groove 33: the high-pressure pump 27 is turned on to inject the slurry in the mixer 25 into the grouting pipe 32 through the slurry pumping pipe 31, and then injected into the soft soil foundation 35 in the model groove 33; specifically, the high-pressure pump 27 is turned on to pump the slurry in the flexible mixer 252 into the grouting pipe 32 in the model groove 33, and the splitting grouting and compaction grouting are used to analyze the soil arch effect and the equal settlement surface position of the pile-supported embankment through the soil pressure box 371 and the multi-point displacement meter 372. The influence law of the placement is analyzed, and the optimal grouting method suitable for the pile-supported embankment is analyzed according to the shear strength of the soil and the slurry diffusion radius; after the optimal grouting method is determined, the model groove 33 is cleaned and the soil is refilled. After the soil is filled, the grouting pipe 32 is installed and the embankment is grouted again through the high-pressure pump 27. The grouting pressure, grouting flow rate and grouting time are adjusted according to the pressure gauge 311 and the flow meter 321, and the influence law of the above-mentioned influencing factors on the shear strength of the soil, the slurry diffusion radius and the soil arch effect is analyzed.

[0054] The fifth step is to clean the model tank 33, cement silo 21, various pipelines and mixer 25 and other equipment, re-determine the type and amount of powdered cementitious material, and carry out the next set of tests.

[0055] The intelligent control system 1 realizes efficient connection and intelligent management of the above-mentioned devices.

[0056] The preferred embodiments of the present invention are described in detail above; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. An indoor intelligent pile-supported embankment grouting simulation device, characterized in that: It comprises an intelligent control system (1), a slurry preparation system (2) and a grouting system (3); The intelligent control system (1) is connected to the slurry preparation system (2) and the grouting system (3) by signals, and can realize efficient connection and intelligent management of various devices in the slurry preparation system (2) and the grouting system (3); The slurry preparation system (2) comprises a cement silo (21), a powdered cementitious material delivery pipeline (22), an electric fan (23), a screw conveyor (24), a mixer (25), a water tank (26) and a high-pressure pump (27); The cement silo (21) is filled with powdered cementitious material; The powdered cementitious material delivery pipeline (22) is arranged horizontally and connected to the bottom of the cement silo (21); The electric fan (23) is connected to the left end of the powdered gelling material conveying pipeline (22); The screw conveyor (24) is connected to the powdered gelling material conveying pipeline (22) and is arranged below the powdered gelling material conveying pipeline (22); The mixer (25) is arranged on the right side of the screw conveyor (24) and is connected to the screw conveyor (24); The water tank (26) is located above the mixer (25) and is connected to the mixer (25) through a water outlet pipe; The high-pressure pump (27) is connected to the mixer (25) and is used to transport the slurry in the mixer (25) to the grouting system (3); The grouting system (3) comprises a slurry pumping pipeline (31), a grouting pipeline (32), a model groove (33), a pile body (34), a soft soil foundation (35), an embankment filling (36) and a monitoring element (37), wherein the pile body (34), the soft soil foundation (35), the embankment filling (36) and the monitoring element (37) are all located in the model groove (33); The slurry pumping pipeline (31) is connected to the high-pressure pump (27); The grouting pipeline (32) is connected below the slurry pumping pipeline (31); The model trough (33) is arranged below the slurry pumping pipeline (31), the model trough (33) is connected to the grouting pipeline (32), a plurality of pile bodies (34) are evenly arranged in the model trough (33), embankment filling (36) is arranged on the top of the pile bodies (34), a soft soil foundation (35) is filled between adjacent pile bodies (34), the bottom of the grouting pipeline (32) is located in the soft soil foundation (35), and the monitoring element (37) is arranged in the embankment filling (36); a drainage valve (331) is arranged at the bottom of the model trough (33).

2. The indoor intelligent pile-supported embankment grouting simulation device according to claim 1 is characterized in that: The intelligent control system (1) comprises a high-performance computer terminal (11), an industrial-grade network interface card (12), an intelligent electric meter (13) and a plurality of STEP expansion modules, wherein the high-performance computer terminal (11), the industrial-grade network interface card (12), the intelligent electric meter (13) and the plurality of STEP expansion modules establish a stable communication link via an RS485 bus (18); The multiple STEP expansion modules include a valve STEP expansion module (14), a motor STEP expansion module (15), a sensor STEP expansion module (16) and a monitoring component STEP expansion module (17); each STEP expansion module realizes efficient connection and intelligent management of various devices in the slurry preparation system (2) and the grouting system (3) through the MODBUS protocol.

3. The indoor intelligent pile-supported embankment grouting simulation device according to claim 1 is characterized in that: There are multiple cement silos (21), each of which contains different types of powdered cementitious materials. Pneumatic knife gate valves (221) are provided at both ends of the connection between the powdered cementitious material delivery pipeline (22) and each cement silo (21), and pneumatic knife gate valves (221) are provided at the connection between the powdered cementitious material delivery pipeline (22) and the screw conveyor (24). An electric butterfly valve (211) is provided at the discharge port at the bottom of each cement silo (21), an electronic weighing scale (212) is provided below each cement silo (21), and pneumatic knife gate valves (221) are provided on the left and right sides of the electronic weighing scale (212); circular notches are provided on the left and right sides of the electronic weighing scale (212), and the on / off state and opening degree of the circular notches are controlled by the pneumatic knife gate valves (221) at the left and right ends of the connection of the cement silo (21); A plurality of wind pollution particle monitoring devices (222) are provided on the powdered gelling material conveying pipeline (22).

4. The indoor intelligent pile-supported embankment grouting simulation device according to claim 1 is characterized in that: The mixer (25) includes a high-speed mixer (251) and a flexible mixer (252); The high-speed mixer (251) is connected to the water tank (26) via a water outlet pipe, and comprises a mixer support (2511), a stirring device (2512), a high-speed mixer discharge device (2514) and a dust removal device (2515); The mixer support (2511) is arranged on the ground; the stirring device (2512) is arranged in the high-speed mixer (251) and driven by the stirring motor (2513); the discharge device is arranged at the bottom of the high-speed mixer (251), and the discharge device (2514) of the high-speed mixer is provided with an electric ball valve (28); the dust removal device (2515) is arranged on the top cover of the high-speed mixer (251); The flexible mixer (252) is connected to the high-speed mixer (251) via a slurry delivery pipeline (2521), and an electric ball valve (28) is provided on the slurry delivery pipeline (2521); a flexible mixer discharge device (2522) is provided at the bottom of the flexible mixer (252), and an electric ball valve (28) is provided on the flexible mixer discharge device (2522); a stopwatch (2523) is provided at the top of the flexible mixer (252); and the flexible mixer (252) is connected to a high-pressure pump (27).

5. The indoor intelligent pile-supported embankment grouting simulation device according to claim 1 is characterized in that: The water outlet pipe comprises a first mist water outlet pipe (261), a second mist water outlet pipe (262) and a conventional water outlet pipe (263); the first mist water outlet pipe (261), the second mist water outlet pipe (262) and the conventional water outlet pipe (263) are all provided with an electric ball valve (28); the first mist water outlet pipe (261), the second mist water outlet pipe (262) and the conventional water outlet pipe (263) are all connected to the top of the mixer (25); and mist nozzles are provided at the water outlets of the first mist water outlet pipe (261) and the second mist water outlet pipe (262).

6. The indoor intelligent pile-supported embankment grouting simulation device according to claim 1 is characterized in that: The left side of the slurry pumping pipeline (31) is arranged from low to high, and the right side is arranged horizontally. A pressure gauge (311) is provided on the slurry pumping pipeline (31); a concrete pier (312) is provided below the left side of the slurry pumping pipeline (31), and the slurry pumping pipeline (31) and the concrete pier (312) are connected via an arched fixing device (313); and the transport pipeline support (38) is also included. The transport pipeline support (38) is arranged outside the model tank (33) and below the right side of the slurry pumping pipeline (31) for fixing the grouting pipeline (32); the grouting pipeline (32) and the transport pipeline support (38) are connected via a pipeline fixing device (39), the grouting pipeline (32) and the model tank (33) are connected via the pipeline fixing device (39), and a flow meter (321) is provided on the grouting pipeline (32).

7. The indoor intelligent pile-supported embankment grouting simulation device according to claim 6 is characterized by: The grouting pipeline (32) includes, from top to bottom, an upper slurry delivery pipeline (322), a middle slurry delivery pipeline (323) and a bottom grouting pipeline (324); The top of the upper slurry delivery pipeline (322) is connected to the slurry pumping pipeline (31), and the bottom is connected to the transport pipeline support (38) through a pipeline fixing device (39); The top of the middle slurry delivery pipeline (323) is connected to the upper slurry delivery pipeline (322), and the bottom is connected to the model tank (33) through a pipeline fixing device (39); The top of the bottom grouting pipe (324) is connected to the middle slurry delivery pipe (323), and the bottom is located in the soft soil foundation (35). The bottom grouting pipe (324) is one or both of a splitting grouting pipe (3241) and a compacting grouting pipe (3242) of different lengths.

8. The indoor intelligent pile-supported embankment grouting simulation device according to claim 1 is characterized by: The monitoring element (37) includes a plurality of soil pressure boxes (371) and a multi-point displacement meter (372), and the plurality of soil pressure boxes (371) and the multi-point displacement meter (372) are uniformly arranged in the transverse direction and the longitudinal direction of the embankment fill (36).

9. The indoor intelligent pile-supported embankment grouting simulation device according to claim 6 is characterized by: The pipeline fixing device (39) comprises two concave rectangular iron blocks, the concave parts of the two concave rectangular iron blocks are arranged opposite to each other to form a cylindrical through hole, the two concave rectangular iron blocks are provided with through holes in the transverse and longitudinal directions, and the two concave rectangular iron blocks are connected by transversely arranged bolts; a bolt hole is provided at the connection between the transport pipeline support (38) and the pipeline fixing device (39), and the pipeline fixing device (39) is connected to the transport pipeline support (38) by longitudinally arranged bolts; a bolt hole is provided at the connection between the model groove (33) and the pipeline fixing device (39), and the pipeline fixing device (39) is connected to the model groove (33) by longitudinally arranged bolts.

10. An indoor intelligent pile-supported embankment grouting simulation method, characterized in that: The following steps are involved: The first step is field sampling and parameter acquisition: field sampling of the embankment fill (36) and the soft soil foundation (35) at the construction site and measurement to obtain relevant parameters; The second step is to make a model groove (33): a pile body (34), a soft soil foundation (35), a road embankment filling (36) and a monitoring element (37) are placed in the model groove (33); the soft soil foundation (35) is fully soaked in water and then injected into the model groove (33); the drainage valve (331) is opened, and drainage and consolidation are carried out under the self-weight of the road embankment filling (36), thereby generating a soil arch effect; The third step is to mix and stir the powdered cementitious material with water: the powdered cementitious material falling from the cement silo (21) is blown to the screw conveyor (24) by the electric fan (23), the screw conveyor (24) conveys the powdered cementitious material to the mixer (25), and the water in the water tank (26) is injected into the mixer (25) to mix and stir with the powdered cementitious material; The fourth step is to inject grout into the soft soil foundation (35) in the model groove (33): the high-pressure pump (27) is turned on to inject the slurry in the mixer (25) into the grouting pipe (32) through the slurry pumping pipe (31), and then inject it into the soft soil foundation (35) in the model groove (33); Step 5: clean the model tank (33), cement silo (21), pipelines and mixer (25), re-determine the powdered cementitious material, and conduct the next set of tests; The intelligent control system (1) realizes efficient connection and intelligent management of the above-mentioned equipment.

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