Intelligent test device for vacuum preloading foundation indoor model test

Abstract

The invention provides a vacuum preloading foundation indoor model test intelligent test device which comprises a control system, a model cylinder, a vacuumizing assembly and a vacuum preloading detection mechanism, a soil sample is placed in the model cylinder, and the vacuumizing assembly is communicated with the model cylinder and used for applying negative pressure to the soil sample; the vacuum preloading detection mechanism is arranged on the model cylinder and is used for detecting parameters of the soil sample after the negative pressure is applied; the control system is connected with the vacuum preloading detection mechanism and used for controlling work of the vacuum preloading detection mechanism and collecting and processing data collected by the vacuum preloading detection mechanism. The device is high in automation degree, high in data precision, easy and convenient to operate and small in size, can be used for research on the influence of a vacuum preloading method on different soil bodies, optimization of vacuum preloading construction parameters, design and construction of vacuum preloading foundation engineering and the like, effectively improves the efficiency and precision of a vacuum preloading foundation indoor model test, and is suitable for popularization and application. And further development and application of the vacuum preloading technology are promoted.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum preloading foundation indoor model test, in particular to an intelligent test device for vacuum preloading foundation indoor model test. Background Art

[0002] In recent years, with the rapid development of my country's economic construction, urban construction has changed with each passing day, and land resources in coastal areas have become increasingly scarce, prompting large-scale sea reclamation projects and dock yard projects to be vigorously carried out in my country's coastal areas. The soil of such project sites is mostly silt, silty soil, and sandy soil with high water content, which must be processed before it can become usable land resources.

[0003] As a commonly used soft soil foundation treatment method, vacuum preloading is widely used in practical engineering. Its principle is to apply negative pressure on the soil surface to reduce the pore water pressure of the soil, thereby improving the strength and compressibility of the soil and achieving the purpose of strengthening the foundation. In order to study the influence of vacuum preloading on different soils and optimize the construction parameters of vacuum preloading, indoor model tests are required.

[0004] However, the current traditional vacuum preloading foundation indoor model test device has some shortcomings, which hinder the development and application of this technology; the shortcomings are as follows:

[0005] 1. The test process is cumbersome and the data collection and analysis efficiency is low. Traditional test equipment usually requires manual adjustment of the vacuum pump, control of the cross drive and static penetration, and manual recording of data. The whole process is time-consuming, labor-intensive and inefficient.

[0006] 2. The test equipment is bulky, occupies a large area, and is not easy to move. Traditional test equipment is large in size, heavy in weight, requires a large space for placement, is not conducive to movement and storage, and limits its application in different laboratories or on-site.

[0007] 3. The accuracy of test data is low, which makes it difficult to meet the requirements of modern engineering for high-precision tests. Traditional test equipment uses manual measurement and data recording, which is prone to errors and makes it difficult to meet the requirements of modern engineering for high-precision test results.

[0008] Therefore, there is an urgent need to develop a new type of vacuum preloading foundation indoor model test device to solve the above problems, improve the test efficiency, accuracy and degree of automation, and meet the needs of modern engineering construction for foundation treatment technology research. Summary of the invention

[0009] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an intelligent test device for vacuum preloading foundation indoor model test, which is used to solve the problems existing in the prior art of vacuum preloading foundation indoor model test and improve the test efficiency, test accuracy and degree of automation.

[0010] To achieve the above-mentioned purpose and other related purposes, the present invention provides an intelligent test device for indoor model test of vacuum preloading foundation, comprising a control system, a model tube, a vacuum pumping component, and a vacuum preloading detection mechanism, wherein a soil sample is placed in the model tube, and the vacuum pumping component is connected to the model tube for applying negative pressure to the soil sample; the vacuum preloading detection mechanism is arranged on the model tube for detecting parameters of the soil sample after negative pressure is applied; the control system is connected to the vacuum preloading detection mechanism for controlling the operation of the vacuum preloading detection mechanism and collecting and processing data collected by the vacuum preloading detection mechanism.

[0011] Preferably, the model cylinder includes a cylinder body, a sealing cover, and a follower plate, wherein the sealing cover is arranged on the top of the cylinder body, and a closed cavity is formed between the sealing cover and the cylinder body; the soil sample is placed in the closed cavity, and the follower plate is placed on the soil sample; a supporting plate is arranged on the top surface of the sealing cover, and a displacement detector is arranged on the supporting plate, and the displacement detector penetrates the sealing cover and detects the height of the follower plate at the same time; the displacement detector is communicatively connected to the control system.

[0012] Preferably, the vacuum preloading detection mechanism includes a soil sample deformation force detection component, a soil sample bearing capacity detection component, and a plurality of sensors; the soil sample deformation force detection component includes a cross driving member, a deformation force driving source, a deformation force transmission rod, and a rotating probe, the cross driving member is arranged on a bearing plate, the deformation force driving source is arranged on the cross driving member, and the vertical lifting and lowering is realized by the cross driving member; the deformation force transmission rod is transmission-connected with the deformation force driving source, and the rotating probe is arranged at one end of the deformation force transmission rod away from the deformation force driving source; the deformation force transmission rod passes through the sealing cover, and a rotating probe through hole is opened on the follower plate, and the rotating probe penetrates into the soil through the rotating probe through hole on the follower plate; the deformation force driving source and the rotating probe are communicatively connected with the control system.

[0013] Preferably, the cross-driving member includes a base, a top plate, a guide rod, an active driving rod, a driving block, an active driving source, and a deformation force driving source support seat, the base is arranged on a bearing plate, the top plate is connected to the base through a guide rod, and the active driving rod is rotatably arranged between the top plate and the base; the driving block is sleeved on the active driving rod and the guide rod, and can move along the guide rod; the active driving source is connected to the active driving rod; and the deformation force driving source support seat is fixed on the driving block.

[0014] Preferably, the soil sample bearing capacity detection assembly includes a support frame, a bearing capacity driving source, a bearing capacity transmission member, a static sounding rod, and a static sounding probe. The support frame is arranged on a bearing plate, the bearing capacity driving source and the bearing capacity transmission member are both arranged on the support frame, the static sounding rod is connected to the bearing capacity driving source through the bearing capacity transmission member, and the static sounding probe is arranged at one end of the static sounding rod away from the bearing capacity transmission member; a static sounding probe through hole is also provided on the follower plate, and the static sounding probe passes through the static sounding probe through hole and penetrates into the soil; the bearing capacity driving source and the static sounding probe are communicatively connected with the control system.

[0015] Preferably, a spiral encoder is provided on the bearing force driving source, and the spiral encoder is communicatively connected with the control system for controlling the driving stroke of the bearing force driving source.

[0016] Preferably, a plurality of sensor through holes are opened on the cylinder wall, and a plurality of sensors are arranged in the sensor through holes for detecting parameters of the soil sample in the cylinder; the plurality of sensors include a vacuum sensor, a pore water pressure sensor, and a water content sensor, and the vacuum sensor, the pore water pressure sensor, and the water content sensor are all communicatively connected with the control system.

[0017] Preferably, the vacuum assembly includes a vacuum pump, a water-gas separation tank, a water pipe, and a drainage board. The water-gas separation tank is arranged outside the model tube, the vacuum pump is connected to the water-gas separation tank, and the water-gas separation tank is connected to the model tube through the water pipe; the drainage board is placed in the soil sample, and one end of the drainage board is connected to the water pipe.

[0018] Preferably, the control system includes a control cabinet and a PC terminal, and the control cabinet is communicatively connected to the PC terminal; the control cabinet is provided with a soil sample deformation force control module, a soil sample bearing capacity control module, and a data acquisition and processing module, the soil sample deformation force control module is communicatively connected to the soil sample deformation force detection component, the soil sample bearing capacity control module is communicatively connected to the soil sample bearing capacity detection component, and the displacement detector and several sensors are communicatively connected to the data acquisition and processing module.

[0019] As described above, the intelligent test device for indoor model test of vacuum preloading foundation according to the present invention has the following beneficial effects:

[0020] The intelligent test device for indoor model test of vacuum preloading foundation involved in the present invention has high automation, high data accuracy, simple operation and compact size. It can be used for studying the influence of vacuum preloading method on different soil bodies, optimizing vacuum preloading construction parameters, designing and constructing vacuum preloading foundation projects, etc. It can effectively improve the efficiency and accuracy of indoor model test of vacuum preloading foundation and promote the further development and application of vacuum preloading technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a structural schematic diagram of an intelligent test device for indoor model test of vacuum preloading foundation involved in the present invention.

[0022] Figure 2 It is a structural schematic diagram of the soil sample deformation force detection component in the present invention;

[0023] Figure 3 It is a structural schematic diagram of the soil sample bearing capacity detection component in the present invention.

[0024] Description of reference numerals:

[0025] 1. Model cylinder; 101. Cylinder body; 102. Sealing cover; 103. Bearing plate; 104. Vacuum sensor; 105. Pore water pressure sensor; 106. Water content sensor; 107. Sensor through hole; 2. Displacement detector; 3. Soil sample deformation force detection assembly; 301. Base; 302. Top plate; 303. Guide rod; 304. Driving block; 305. Deformation force driving source support seat; 306. Active driving rod; 307. Active driving source; 308. Deformation force driving source; 309. Deformation force transmission rod; 310. Rotating probe; 4. Soil sample bearing capacity detection assembly; 401. Support frame; 402. Bearing capacity driving source; 403. Bearing capacity transmission member; 404. Static penetration rod; 405. Static penetration probe; 5. Control cabinet; 6. PC terminal; 7. Water-gas separation tank; 8. Vacuum pump. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] like Figure 1-Figure 3As shown, the present invention provides an intelligent test device for indoor model test of vacuum preloading foundation, comprising a control system, a model tube 1, a vacuum pumping component, and a vacuum preloading detection mechanism, wherein a soil sample is placed in the model tube 1, and the vacuum pumping component is connected to the model tube 1 for applying negative pressure to the soil sample; the vacuum preloading detection mechanism is arranged on the model tube 1 for detecting parameters of the soil sample after negative pressure is applied; the control system is connected to the vacuum preloading detection mechanism for controlling the operation of the vacuum preloading detection mechanism and collecting and processing data collected by the vacuum preloading detection mechanism.

[0029] Preferably, Figure 1 As shown, the model cylinder 1 includes a cylinder 101, a sealing cover 102, and a follower plate (the follower plate is not drawn), the sealing cover 102 is arranged on the top of the cylinder 101, and a closed cavity is formed between the sealing cover 102 and the cylinder 101; the soil sample is placed in the closed cavity, and the follower plate is placed on the soil sample; a bearing plate 103 is arranged on the top surface of the sealing cover 102, and a displacement detector 2 is arranged on the bearing plate 103, and the displacement detector 2 penetrates the sealing cover 102 in the vertical direction and detects the height of the follower plate at the same time; the displacement detector 2 is connected to the control system for communication. In this embodiment, a sealing strip and a latex film are arranged between the sealing cover 102 and the cylinder 101 for sealing to ensure the stability of the vacuum degree during the test. The inner diameter of the model cylinder 1 is 750mm, the height is 1200mm, and the wall thickness is 5mm, which can accommodate a sufficient amount of soil samples for experiments.

[0030] Preferably, Figure 1-Figure 3 As shown, the vacuum preloading detection mechanism includes a soil sample deformation force detection component 3, a soil sample bearing capacity detection component 4, and a plurality of sensors; the soil sample deformation force detection component 3 includes a cross driving member, a deformation force driving source 308, a deformation force transmission rod 309, and a rotating probe 310, the cross driving member is arranged on the bearing plate 103, the deformation force driving source 308 is arranged on the cross driving member, and the vertical lifting and lowering is realized by the cross driving member; the deformation force transmission rod 309 is transmission-connected with the deformation force driving source 308, and the rotating probe 310 is arranged at the bottom end of the deformation force transmission rod 309; the deformation force transmission rod 309 passes through the sealing cover 102, and a rotating probe through hole is opened on the follower plate, and the rotating probe 310 penetrates into the soil through the rotating probe through hole on the follower plate; the deformation force driving source 308 and the rotating probe 310 are communication-connected with the control system.

[0031] In this embodiment, the height of the deformation force driving source 308 is adjusted by a cross driving member, and then the depth of the rotating probe 310 into the soil sample is adjusted, and the deformation force driving source 308 is started. The deformation force driving source 308 drives the rotating probe 310 to rotate through the deformation force transmission rod 309, and applies a rotational torque to the soil sample. Then, the torque reaction force fed back by the soil sample is collected through the rotating probe 310, thereby realizing the detection and collection of the torque reaction force of the soil sample at a certain depth.

[0032] Preferably, Figure 1 , Figure 2 As shown, the cross driving member includes a base 301, a top plate 302, a guide rod 303, an active driving rod 306, a driving block 304, an active driving source 307, and a deformation force driving source support seat 305. The base 301 is arranged on the bearing plate 103, the top plate 302 is connected to the base 301 through the guide rod 303, and the active driving rod 306 is rotatably arranged between the top plate 302 and the base 301; the driving block 304 is sleeved on the active driving rod 306 and the guide rod 303, and can move along the guide rod 303; the active driving source 307 is connected to the active driving rod 306; the deformation force driving source support seat 305 is fixed on the driving block 304. In this embodiment, the active driving rod 306 extends vertically in the up and down directions. The active driving rod 306 adopts a screw rod. A threaded hole is opened in the driving block 304. The driving block 304 is set on the active driving rod 306 through the threaded hole, and as the active driving rod 306 rotates, the driving block 304 will move along the guide rod 303, thereby driving the active driving source 307 set on the driving block 304 to move up and down.

[0033] Furthermore, the active driving source 307 can be driven by an electric drive or by a manual drive. When the electric drive is adopted, the active driving source 307 can be a stepper motor, and the active driving source 307 is connected to the control system, and the angle of rotation of the active driving source 307 is realized by the control system, thereby controlling the lifting height of the driving block 304 on the guide rod 303, and adjusting the depth of the rotating probe 310 into the soil sample. When the manual drive is adopted, the active driving source 307 can be a hand wheel, and the deformation force transmission rod 309 is provided with a scale line. The operator drives the active driving rod 306 to rotate through the hand wheel, thereby driving the driving block 304 to rise and fall, and adjusting the depth of the rotating probe 310 into the soil sample through the scale line.

[0034] Preferably, Figure 1 , Figure 3 As shown, the soil sample bearing capacity detection component 4 includes a support frame 401, a bearing capacity driving source 402, a bearing capacity transmission member 403, a static sounding rod 404, and a static sounding probe 405. The support frame 401 is arranged on the bearing plate 103, the bearing capacity driving source 402 and the bearing capacity transmission member 403 are both arranged on the support frame 401, the static sounding rod 404 is connected with the bearing capacity driving source 402 through the bearing capacity transmission member 403, and the static sounding probe 405 is arranged at the bottom end of the static sounding rod 404; a static sounding probe through hole is also opened on the follower plate, and the static sounding probe 405 passes through the static sounding probe through hole and penetrates into the soil; the bearing capacity driving source 402 and the static sounding probe 405 are communicatively connected with the control system.

[0035] Furthermore, a spiral encoder is provided on the bearing force driving source 402, and the spiral encoder is connected to the control system for controlling the driving stroke of the bearing force driving source 402. In this embodiment, the bearing force driving source 402 adopts a stepper motor, and the control system realizes the control of the angle of the stepper motor through the spiral encoder. The bearing force transmission member 403 adopts a gear and rack meshing mode, the gear is installed on the output shaft of the stepper motor, and the rack is installed on the outer peripheral surface of the static sounding rod 404. The bearing force driving source 402 drives the gear to rotate, and then the gear and rack mesh to realize the lifting and lowering of the static sounding rod 404, thereby adjusting the depth of the static sounding probe 405 penetrating into the soil sample.

[0036] In this embodiment, the control system controls the rotation angle of the bearing-capacity driving source 402 through a spiral encoder, and then drives the static sounding rod 404 to rise and fall through the bearing-capacity transmission member 403, and the static sounding probe 405 penetrates into the soil sample to a certain depth. In the process of the static sounding probe 405 penetrating into the soil sample, the static sounding probe 405 collects the bearing-capacity reaction force fed back by the soil sample, thereby realizing the collection of the bearing-capacity reaction force of the soil sample.

[0037] Preferably, Figure 1 As shown, a plurality of sensor through holes 107 are opened on the cylinder wall of the cylinder 101, and a plurality of sensors are arranged in the sensor through holes 107 for detecting the parameters of the soil sample in the cylinder 101; the plurality of sensors include a vacuum sensor 104, a pore water pressure sensor 105, and a water content sensor 106, and the vacuum sensor 104, the pore water pressure sensor 105, and the water content sensor 106 are all communicatively connected with the control system.

[0038] Furthermore, in this embodiment, the vacuum sensor 104 is used to detect the vacuum negative pressure in the soil sample in real time, the pore water pressure sensor 105 is used to detect the pore water pressure in the soil sample in real time, and the water content sensor 106 is used to detect the water content in the soil sample in real time. In addition, a sensor through hole 107 is reserved on the cylinder 101, and the sensor through hole 107 is used to place subsequent sensors. In the test state, the reserved sensor through hole 107 is blocked.

[0039] Preferably, Figure 1 As shown, the vacuum assembly includes a vacuum pump 8, a water-gas separation tank 7, a water guide pipe, and a drainage board. The water-gas separation tank 7 is arranged outside the model tube 1, and the vacuum pump 8 is connected to the water-gas separation tank 7. The water-gas separation tank 7 is connected to the model tube 1 through the water guide pipe. The drainage board is placed in the soil sample, and one end of the drainage board is connected to the water guide pipe. The water guide pipe runs through the wall of the cylinder body 101 and is connected to the drainage board.

[0040] In this embodiment, the vacuum pump 8 and the water-gas separation tank 7 are used together to generate negative pressure, and the water-gas separation tank 7 is always placed on an electronic scale, which is connected to the control cabinet 5 in communication, and can weigh the amount of water discharged from the soil sample in real time, and record the change in the amount of water discharged, so as to provide reliable data for analyzing the compressibility of the soil. The vacuum pump 8 is a key device for generating negative pressure, and the water-gas separation tank 7 is used to ensure the normal operation of the vacuum pump 8. The pore water and air in the soil sample enter the water-gas separation tank 7, and the water and air are separated, so as to avoid water vapor from entering the vacuum pump 8, thereby ensuring the normal operation of the vacuum pump 8 and extending the service life of the equipment.

[0041] Preferably, Figure 1 As shown, the control system includes a control cabinet 5 and a PC terminal 6, and the control cabinet 5 is communicatively connected to the PC terminal 6; a soil sample deformation force control module, a soil sample bearing capacity control module, and a data acquisition and processing module are arranged in the control cabinet 5, the soil sample deformation force control module is communicatively connected to the soil sample deformation force detection component 3, the soil sample bearing capacity control module is communicatively connected to the soil sample bearing capacity detection component 4, and the displacement detector 2 and a plurality of sensors are communicatively connected to the data acquisition and processing module.

[0042] Furthermore, in this embodiment, the soil sample deformation force control module is connected to the deformation force driving source 308 in communication, and is used to control the operation of the deformation force driving source 308; the soil sample deformation force control module is connected to the rotating probe 310 in communication, and collects and processes the torque force collected by the rotating probe 310. The soil sample bearing capacity control module is connected to the bearing capacity driving source 402 in communication, and is used to control the rotation angle of the bearing capacity driving source 402, so as to achieve the depth of the static penetration probe 405 in the soil; the soil sample bearing capacity control module is connected to the static penetration probe 405 in communication, and collects and processes the pressure reaction force collected by the static penetration probe 405.

[0043] The intelligent test device for indoor model test of vacuum preloading foundation according to the present invention has the following working steps:

[0044] S1: According to the attached Figure 1-Figure 3 , and the above description of each component, assemble and connect the above components.

[0045] S2: Collect a certain amount of soil sample and place the soil sample in the model cylinder 1, install the sealing cover 102 on the top of the cylinder 101, and ensure the airtightness between the cylinder 101 and the sealing cover 102; install the vacuum sensor 104, the pore water pressure sensor 105, and the water content sensor 106 in the corresponding sensor through hole 107; place the drainage board at the bottom of the soil sample, and connect the water pipe to one end of the drainage board;

[0046] S3: Start the vacuum pump 8, which performs vacuum negative pressure treatment on the soil sample through the water-gas separation tank 7, and the pore water in the soil enters the water-gas separation tank 7 through the drainage plate and the water pipe; the electronic scale below the water-gas separation tank 7 detects the amount of water discharged from the soil sample in real time, and feeds back the amount of water discharged to the control cabinet 5; the vacuum sensor 104 detects the vacuum degree in the soil sample in real time, the pore water pressure sensor 105 detects the pore water pressure in the soil sample in real time, and the water content sensor 106 detects the water content in the soil sample in real time; the soil sample parameters detected by the vacuum sensor 104, the pore water pressure sensor 105, and the water content sensor 106 are fed back to the control cabinet 5;

[0047] S4: When the vacuum pump 8 evacuates the soil sample in step S3, the pore water in the soil sample will be discharged, the soil sample will consolidate and shrink, and the height of the follower plate will drop. The displacement detector 2 detects the height of the follower plate in real time and feeds back the height change of the follower plate to the control cabinet 5;

[0048] S5: When the vacuum pump 8 in step S3 evacuates the soil sample and keeps the pressure in the soil sample at a fixed value for a period of time, a certain amount of pore water in the soil sample has been discharged; the active driving source 307 is started to work, and the active driving source 307 drives the active driving rod 306 to rotate, and the driving block 304 moves downward along the guide rod 303 under the action of the threaded connection, and then the deformation force driving source 308, the deformation force transmission rod 309, and the rotating probe 310 on the driving block 304 all move downward, and the rotating probe 310 passes through the rotating probe through hole into the soil sample. The deformation force driving source 308 is started by the control system, and the deformation force driving source 308 drives the rotating probe 310 to rotate through the deformation force transmission rod 309. The rotating probe 310 rotates in the soil sample, and the rotating probe 310 applies a lateral shear load to the soil sample. Then the soil sample feeds back a lateral deformation force to the rotating probe 310, and the rotating probe 310 transmits the magnitude of the force fed back by the soil sample to the control cabinet 5; then the rotating probe 310 can continue to be controlled to move downward to measure the magnitude of the force of the soil samples at different depths;

[0049] S6: After the rotating probe 310 completes the lateral deformation force detection of the soil sample in step S5, the bearing force driving source 402 is started through the control system, and the bearing force driving source 402 drives the static sounding rod 404 to descend through the bearing force transmission member 403, and the static sounding probe 405 passes through the static sounding probe through hole and enters the soil sample. When the bearing force driving source 402 rotates to the set angle, that is, the static sounding rod 404 descends to a fixed depth, during the descent process, the static sounding probe 405 collects the reaction force applied by the soil sample, and the static sounding probe 405 transmits the magnitude of the reaction force fed back by the soil sample to the control cabinet 5;

[0050] S7: The data acquisition and processing module in the control cabinet 5 analyzes and integrates the data in the above experiments, generates a test report, and displays it through the corresponding software in the PC terminal 6. The test report includes the vacuum change curve, the pore water pressure change curve, the water content change curve, the load and settlement curve of the rotating probe 310, the load and penetration depth curve of the static penetration probe 405, the drainage change curve, etc. The test report is displayed through the PC terminal 6;

[0051] S8: When the test report in step S7 is completed, the vacuum pump 8 is stopped, the control cabinet 5 is closed, and the test is finished. After the test data and the report are saved, the soil sample in the cylinder 101 is cleaned, and then the cylinder 101 is cleaned.

[0052] Preferably, in step S5, when the active driving source 307 adopts a stepping motor, it is necessary to set the rotation angle of the active driving source 307 through the control system so that the rotating probe 310 reaches a fixed soil sample depth; when the active driving source 307 adopts handwheel adjustment, it is necessary to adjust the depth of the rotating probe 310 in the soil sample through the scale line on the deformation force transmission rod 309.

[0053] Preferably, the detection of the lateral deformation force of the soil sample in step S5 and the detection of the load reaction force of the soil sample in step S6 do not necessarily follow the procedure of first performing step S5 and then performing step S6. Step S6 may also be performed first and then performing step S5.

[0054] The intelligent test device for indoor model test of vacuum preloading foundation disclosed by the present invention solves the problems of complicated process operation, low efficiency of data collection and analysis, bulky device, large floor space and low data accuracy in the prior art test. The device in the present application has high automation, high data accuracy, simple operation and compact size, and can be used for studying the influence of vacuum preloading method on different soil bodies, optimizing vacuum preloading construction parameters, designing and constructing vacuum preloading foundation projects, etc., effectively improving the efficiency and accuracy of indoor model test of vacuum preloading foundation, and promoting the further development and application of vacuum preloading technology.

[0055] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An intelligent test device for indoor model test of vacuum preloading foundation, characterized by: The invention comprises a control system, a model cylinder (1), a vacuum pumping component, and a vacuum pre-pressure detection mechanism, wherein a soil sample is placed in the model cylinder (1), and the vacuum pumping component is connected to the model cylinder (1) and is used to apply negative pressure to the soil sample; the vacuum pre-pressure detection mechanism is arranged on the model cylinder (1) and is used to detect parameters of the soil sample after negative pressure is applied; the control system is connected to the vacuum pre-pressure detection mechanism and is used to control the operation of the vacuum pre-pressure detection mechanism and collect and process data collected by the vacuum pre-pressure detection mechanism.

2. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 1 is characterized in that: The model cylinder (1) comprises a cylinder body (101), a sealing cover (102), and a follower plate; the sealing cover (102) is arranged on the top of the cylinder body (101); a closed cavity is formed between the sealing cover (102) and the cylinder body (101); a soil sample is placed in the closed cavity, and the follower plate is placed on the soil sample; A bearing plate (103) is arranged on the top surface of the sealing cover (102), and a displacement detector (2) is arranged on the bearing plate (103). The displacement detector (2) penetrates the sealing cover (102) and detects the height of the follower plate at the same time; the displacement detector (2) is communicatively connected with a control system.

3. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 2 is characterized by: The vacuum preloading detection mechanism comprises a soil sample deformation force detection component (3), a soil sample bearing capacity detection component (4), and a plurality of sensors; the soil sample deformation force detection component (3) comprises a cross driving member, a deformation force driving source (308), a deformation force transmission rod (309), and a rotating probe (310); the cross driving member is arranged on a bearing plate (103); the deformation force driving source (308) is arranged on the cross driving member, and vertical lifting is achieved through the cross driving member; the deformation force detection component (3) comprises a cross driving member, a deformation force driving source (308), a deformation force transmission rod (309), and a rotating probe (310); the cross driving member is arranged on a bearing plate (103); the deformation force driving source (308) is arranged on the cross driving member, and vertical lifting is achieved through the cross driving member; The force transmission rod (309) is transmission-connected to the deformation force driving source (308); the rotating probe (310) is arranged at one end of the deformation force transmission rod (309) away from the deformation force driving source (308); the deformation force transmission rod (309) passes through the sealing cover (102), and a rotating probe through hole is provided on the follower plate, and the rotating probe (310) penetrates into the soil through the rotating probe through hole on the follower plate; the deformation force driving source (308) and the rotating probe (310) are communication-connected to the control system.

4. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 3 is characterized by: The cross driving member comprises a base (301), a top plate (302), a guide rod (303), an active driving rod (306), a driving block (304), an active driving source (307), and a deformation force driving source support seat (305); the base (301) is arranged on a bearing plate (103); the top plate (302) is connected to the base (301) via a guide rod (303); the active driving rod (306) is rotatably arranged between the top plate (302) and the base (301); the driving block (304) is sleeved on the active driving rod (306) and the guide rod (303), and can move along the guide rod (303); the active driving source (307) is connected to the active driving rod (306); and the deformation force driving source support seat (305) is fixed on the driving block (304).

5. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 2 is characterized in that: The soil sample bearing capacity detection assembly (4) comprises a support frame (401), a bearing capacity driving source (402), a bearing capacity transmission member (403), a static sounding rod (404), and a static sounding probe (405); the support frame (401) is arranged on a bearing plate (103); the bearing capacity driving source (402) and the bearing capacity transmission member (403) are both arranged on the support frame (401); the static sounding rod (404) is connected to the bearing capacity driving source (402) via the bearing capacity transmission member (403); the static sounding probe (405) is arranged at one end of the static sounding rod (404) away from the bearing capacity transmission member (403); a static sounding probe through hole is also provided on the follower plate; the static sounding probe (405) penetrates through the static sounding probe through hole and penetrates into the soil; the bearing capacity driving source (402) and the static sounding probe (405) are communicatively connected with a control system.

6. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 5 is characterized by: The bearing force driving source (402) is provided with a spiral encoder, which is communicatively connected with the control system and is used to control the driving stroke of the bearing force driving source (402).

7. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 2 is characterized by: A plurality of sensor through holes (107) are provided on the cylinder wall of the cylinder (101), and a plurality of sensors are arranged in the sensor through holes (107) for detecting parameters of the soil sample in the cylinder (101); the plurality of sensors include a vacuum sensor (104), a pore water pressure sensor (105), and a water content sensor (106), and the vacuum sensor (104), the pore water pressure sensor (105), and the water content sensor (106) are all communicatively connected with a control system.

8. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 1 is characterized by: The vacuum pump assembly comprises a vacuum pump (8), a water-gas separation tank (7), a water guide pipe, and a drainage board; the water-gas separation tank (7) is arranged outside the model tube (1); the vacuum pump (8) is connected to the water-gas separation tank (7); the water-gas separation tank (7) is connected to the model tube (1) via the water guide pipe; the drainage board is placed in the soil sample, and one end of the drainage board is connected to the water guide pipe.

9. The intelligent test device for indoor model test of vacuum preloading foundation according to claim 3 is characterized by: The control system comprises a control cabinet (5) and a PC terminal (6), wherein the control cabinet (5) is communicatively connected to the PC terminal (6); a soil sample deformation force control module, a soil sample bearing capacity control module, and a data acquisition and processing module are arranged in the control cabinet (5); the soil sample deformation force control module is communicatively connected to a soil sample deformation force detection component (3), the soil sample bearing capacity control module is communicatively connected to a soil sample bearing capacity detection component (4), and the displacement detector (2) and a plurality of sensors are communicatively connected to the data acquisition and processing module.

Images