A pile foundation seismic liquefaction performance evaluation instrument

Abstract

The present invention discloses a pile foundation seismic liquefaction performance evaluation instrument, which relates to the technical field of pile foundation seismic performance evaluation, and includes a base plate, and an evaluation component is arranged on the top of the base plate. When the present invention is used, the reinforcing rod is pushed downward so that the moving block enters the interior of the fixed block, and the reinforcing rod is rotated. When the clamping column is rotated to the top groove, the clamping column is pushed into the top groove under the elastic force of the spring, so that the first model box is fixed on the three-axis electromagnetic vibration table. This installation method will not cause damage to the table surface of the three-axis electromagnetic vibration table. The reinforcing rod is pushed downward again to push the clamping column out of the top groove, and then the reinforcing rod is rotated so that the moving block is flush with the movable hole, and the moving block is pushed out from the interior of the fixed block according to the elastic force of the spring, and then the rotating rod is pushed outward to make it leave from the top of the fixed block, and the first model box can be removed from the top of the three-axis electromagnetic vibration table, so as to achieve the effect of convenient disassembly.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation seismic performance evaluation, in particular to a pile foundation seismic liquefaction performance evaluation instrument. Background Art

[0002] Pile foundation is a form of deep foundation, mainly composed of pile body and pile cap. The pile body is a columnar structure deep underground, and the pile cap is located on the ground or close to the ground. The function of the pile foundation is to transfer the load of the upper structure such as the building through the pile body to the deep soil or rock layer with good bearing capacity to ensure the stability of the building. The seismic liquefaction performance assessment of the pile foundation is to analyze and evaluate the liquefaction phenomenon that may occur in the pile foundation under the action of an earthquake. Liquefaction refers to the loss of solid skeleton of saturated soil under dynamic load (such as earthquake), resulting in an instantaneous reduction in strength, which may cause surface settlement, cracks and foundation failure.

[0003] In the prior art, the purpose of evaluating the seismic liquefaction performance of pile foundations is to ensure that the pile foundation can maintain the necessary support capacity to protect the safety of the superstructure during an earthquake event. During the evaluation of the seismic liquefaction performance of pile foundations, the model box needs to be placed on the earthquake simulation equipment. In order to ensure that the model box does not move during vibration and to ensure the accuracy of the data, bolts need to be used to tightly connect the model box to the table of the earthquake simulation equipment. However, this method of fixing will cause certain damage to the table of the earthquake simulation equipment. After completing the evaluation of the seismic liquefaction performance, the model box needs to be disassembled. The disassembly process is relatively cumbersome and requires the use of tools to remove the bolts one by one, which takes a lot of time.

[0004] The present invention proposes a pile foundation anti-seismic liquefaction performance evaluation instrument to solve the problems raised in the above background technology. Summary of the invention

[0005] The purpose of the present invention is to provide a pile foundation anti-seismic liquefaction performance evaluation instrument to solve the problem that in the process of pile foundation anti-seismic liquefaction performance evaluation proposed in the above background technology, the model box needs to be connected to the table of the earthquake simulation equipment with bolts. However, this fixing method will cause certain damage to the table of the earthquake simulation equipment, and the subsequent disassembly process is relatively troublesome, requiring the use of tools to remove the bolts one by one, which takes a lot of time.

[0006] To achieve the above object, the present invention provides the following technical solution: a pile foundation anti-seismic liquefaction performance evaluation instrument, comprising a base plate, an evaluation component is arranged on the top of the base plate, a fixing component is arranged on the outer surface of the evaluation component, and an auxiliary component is arranged on the outer surface of the fixing component;

[0007] The evaluation component includes a simulation table, a three-axis electromagnetic vibration table is arranged on the top of the simulation table, a first model box is arranged on the top of the three-axis electromagnetic vibration table, two fixed blocks are fixedly installed on the outer surfaces of the four sides of the first model box near the bottom, and fixed rods are movably embedded in the interiors of the eight fixed blocks, and mobile racks are fixedly installed on the outer surfaces of the eight fixed rods, and springs are fixedly connected to the bottoms of the eight mobile racks, and two top grooves are provided on the top surfaces of the interiors of the eight fixed blocks;

[0008] The fixing assembly includes a fixing plate, and four mounting blocks are fixedly installed on the outer surfaces of the four sides of the fixing plate. The sixteen mounting blocks are grouped into two in each transverse distribution. Damping shafts are arranged inside the eight groups of mounting blocks. The eight damping shafts are grouped into two each. Rotating rods are arranged on the outer surfaces of the four groups of damping shafts. Two fastening holes are provided on the outer surfaces of the four rotating rods near the top.

[0009] Preferably, reinforcement rods are movably embedded in the eight fastening holes, moving blocks are fixedly installed at the bottom ends of the eight reinforcement rods, two clamping columns are fixedly installed on the tops of the eight moving blocks, the interior of the fixed plate is fixedly installed on the outer surface of the simulation table near the top, a controller is arranged inside the simulation table, and a control system is arranged on the outer surface of the base plate.

[0010] Preferably, one ends of the eight springs are respectively fixedly mounted on the bottom surfaces inside the eight fixed blocks, movable holes are respectively opened on the tops of the eight fixed blocks, the outer surfaces of the eight fixed rods are respectively movably embedded in the eight movable holes near one ends, and the outer surfaces of the eight movable frames are respectively fixedly mounted with four limit blocks.

[0011] Preferably, limiting grooves are provided on both sides of the interior of the eight fixed blocks, and each group of two limiting blocks distributed vertically constitutes a group. The outer surfaces of the sixteen groups of limiting blocks are movably embedded in the sixteen limiting grooves, and the bottom of the simulation table is fixedly installed on the top of the base plate.

[0012] Preferably, a second model box is arranged on the top of the first model box, and a card plate is fixedly installed on the top of the first model box and the top of the second model box, and a sealing strip is fixedly connected to the top of the two card plates, and a sleeve plate is fixedly connected to the bottom of the second model box, and a plurality of plug rods are fixedly installed on the bottom of the sleeve plate, wherein the top of one of the sealing strips contacts the bottom of the second model box, and the bottom of the sleeve plate contacts the top of the first model box, and a plurality of slots are opened on the top of the first model box and the top of the second model box, and the outer surfaces of the plurality of plug rods are movably embedded in the plurality of slots respectively.

[0013] Preferably, the auxiliary component includes four mounting plates, an electric push rod is fixedly installed on the outer surface of one side of the four mounting plates near the top, a push-pull plate is fixedly installed on one end of the four electric push rods, a push-pull rod is fixedly installed on the top of the four push-pull plates near both sides, and two sliding rods are fixedly installed on the outer surface of the four push-pull plates.

[0014] Preferably, every two adjacent sliding bars of the eight sliding bars form a group, one ends of the four groups of sliding bars respectively movably penetrate the outer surfaces of the four mounting plates, a vibration sensor is arranged on the front surface of the first model box, every two of the eight fixed blocks form a group, an export frame is arranged at the bottom of the four groups of fixed blocks, and two support rods are fixedly installed at the bottom of the four export frames.

[0015] Preferably, the outer surfaces of the four sides of the first model box are provided with flow holes near the bottom, the outer surfaces of the four sides of the first model box are fixedly installed with connecting plates near the flow holes, the outer surfaces of the four connecting plates are provided with sealing grooves, the insides of the four sealing grooves are movably embedded with sealing plates, the outer surfaces of one side of the four sealing plates are fixedly installed with sealing plates, the outer surfaces of the four sealing plates are movably embedded in the insides of the four connecting plates, and the other side outer surfaces of the four sealing plates are fixedly connected with two pull rings.

[0016] Preferably, fixing grooves are provided on the bottoms of the four blocking plates near both sides, and card slots are provided on the outer surfaces of one side of the eight fixing blocks near the top. Two horizontally distributed card slots form a group of eight card slots, and the outer surfaces of both sides of the four blocking plates near the top are movably embedded in the four groups of card slots, and the other ends of the eight fixing rods are movably inserted into the interiors of the eight card slots, and the other ends of the eight fixing rods are movably embedded in the interiors of the eight fixing grooves.

[0017] Preferably, the four mounting plates are respectively mounted on the four side outer surfaces of the base plate by bolts, the outer surfaces of the eight push-pull rods are respectively movably embedded in the eight pull rings, the bottom ends of the eight support rods are all fixedly mounted on the top of the base plate, and the tops of the four lead-out frames are respectively in contact with the bottoms of the four connecting plates.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the present invention is used, the reinforcing rod is pushed downward so that the moving block enters the interior of the fixed block. At the same time, the fixed rod and the moving frame are moved downward by pressure, and the spring is squeezed, so that the other end of the fixed rod moves from the fixed groove to the interior of the fixed block. Then the reinforcing rod is rotated. When the card column rotates to the top groove, the moving block is pushed upward under the elastic force of the spring, so that the card column is pushed into the top groove. With the cooperation of the fixed component, the first model box is fixed on the three-axis electromagnetic vibration table. This installation method will not cause damage to the table surface of the three-axis electromagnetic vibration table. Push the reinforcing rod downward again to push the card column out of the top groove, and then rotate the reinforcing rod so that the moving block is flush with the movable hole. Following the elastic force of the spring, the moving block is pushed out from the interior of the fixed block, and then the rotating rod is pushed outward to make it leave the top of the fixed block. The first model box can be removed from the top of the three-axis electromagnetic vibration table, thereby achieving the effect of convenient disassembly. The process is simple and does not require the help of other tools, which reduces time.

[0020] 2. When the present invention is used, a soil model and a pile foundation model are prepared in a first model box, and sensors are installed in the soil model and on the pile foundation model. A three-axis electromagnetic vibration table is started to generate vibrations in different directions, truly simulating the effects of seismic waves in different directions. During the loading process, the control system receives various signals collected by the sensor and converts these analog signals into digital signals. The collected data is stored, analyzed and processed by computer software for evaluation.

[0021] 3. When the present invention is used, the vibration condition of the first model box is detected by a vibration sensor. When the vibration data is abnormal, the control system will control the four electric push rods to start, pull the push-pull plate outward, and pull the sealing plate out of the sealing groove through the cooperation of the push-pull rod and the pull ring. During the earthquake simulation process, when the soil liquefies, it will diffuse and flow outward through the flow holes and the connecting plates, and the outflowing liquid soil will be guided to the soil receiving box through the lead-out frame, reducing subsequent cleaning work. Under the action of the auxiliary components, the liquefied soil is allowed to flow out naturally, simulating the liquefaction phenomenon in the real geological environment, which is conducive to improving the authenticity of the evaluation.

[0022] 4. When the present invention is used, the first model box and the second model box are configured to be spliced, and the assessor can select the number of the second model boxes according to actual conditions. By splicing different numbers of second model boxes, the overall depth can be increased to simulate soil and pile foundations of different depths, thereby meeting the assessment requirements of pile foundations of different depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A first-angle stereoscopic view of a pile foundation anti-seismic liquefaction performance evaluation instrument according to the present invention;

[0024] Figure 2A second-angle stereoscopic view of a pile foundation anti-seismic liquefaction performance evaluation instrument according to the present invention;

[0025] Figure 3 It is a structural unfolded stereogram of an evaluation component in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0026] Figure 4 It is a structural expansion stereogram of the second model box in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0027] Figure 5 It is a structural unfolded stereogram of a connecting plate in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0028] Figure 6 It is a structural unfolded stereogram of a fixed block in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0029] Figure 7 It is a structural unfolded stereogram of an auxiliary component in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0030] Figure 8 It is a structural unfolded stereogram of a plugging plate in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0031] Fig. 9 It is a structural expansion stereogram of a reinforcement rod in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0032] Fig.10 It is a structural unfolded stereogram of a fixing rod in a pile foundation anti-seismic liquefaction performance evaluation instrument of the present invention;

[0033] Fig.11 The present invention is a perspective view of the structure of a fixed component in a pile foundation anti-seismic liquefaction performance evaluation instrument.

[0034] In the figure:

[0035] 1. Bottom plate; 2. Evaluation component; 201. Simulation table; 202. Controller; 203. Three-axis electromagnetic vibration table; 204. Control system; 205. First model box; 206. Second model box; 207. Card plate; 208. Sealing strip; 209. Set plate; 210. Insert rod; 211. Slot; 212. Flow hole; 213. Connecting plate; 214. Sealing groove; 215. Fixed block; 216. Card slot; 217. Fixed rod; 218. Moving frame; 219. Spring; 220. Activity hole; 221. Blocking plate; 2 22. Sealing plate; 223. Fixing groove; 224. Top groove; 225. Limiting block; 226. Limiting groove; 227. Pull ring; 3. Fixing assembly; 301. Fixing plate; 302. Mounting block; 303. Damping shaft; 304. Rotating rod; 305. Fastening hole; 306. Reinforcement rod; 307. Moving block; 308. Clamping column; 4. Auxiliary assembly; 401. Mounting plate; 402. Electric push rod; 403. Push-pull plate; 404. Push-pull rod; 405. Sliding rod; 406. Vibration sensor; 5. Lead-out frame; 6. Support rod. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1-Figure 11As shown, the present invention provides a technical solution: a pile foundation anti-seismic liquefaction performance evaluation instrument, comprising a bottom plate 1, an evaluation component 2 is arranged on the top of the bottom plate 1, a fixing component 3 is arranged on the outer surface of the evaluation component 2, and an auxiliary component 4 is arranged on the outer surface of the fixing component 3; the evaluation component 2 comprises a simulation table 201, a three-axis electromagnetic vibration table 203 is arranged on the top of the simulation table 201, a first model box 205 is arranged on the top of the three-axis electromagnetic vibration table 203, two fixing blocks 215 are fixedly installed on the four sides of the outer surface of the first model box 205 near the bottom, and fixing rods are movably embedded in the interiors of the eight fixing blocks 215 217, the outer surfaces of the eight fixed rods 217 are fixedly installed with movable frames 218, the bottoms of the eight movable frames 218 are fixedly connected with springs 219, and the top surfaces of the eight fixed blocks 215 are each provided with two top grooves 224; the fixed assembly 3 includes a fixed plate 301, and the outer surfaces of the four sides of the fixed plate 301 are each fixedly installed with four mounting blocks 302, and each of the sixteen mounting blocks 302 is a group of two mounting blocks 302 distributed laterally, and the interiors of the eight groups of mounting blocks 302 are each provided with damping shafts 303, and each of the eight damping shafts 303 is a group of two, and the outer surfaces of the four groups of damping shafts 303 are each provided with A rotating rod 304 is arranged, and two fastening holes 305 are provided on the outer surfaces of the four rotating rods 304 near the top. A reinforcing rod 306 is movably embedded in the eight fastening holes 305. A moving block 307 is fixedly installed at the bottom end of the eight reinforcing rods 306. Two clamping columns 308 are fixedly installed on the top of the eight moving blocks 307. The interior of the fixed plate 301 is fixedly installed on the outer surface of the simulation platform 201 near the top. The simulation platform 201 is provided with a controller 202. The outer surface of the bottom plate 1 is provided with a control system 204. One end of the eight springs 219 is fixedly installed on the eight fixed blocks respectively. The bottom surface of the interior of 215, the tops of the eight fixed blocks 215 are all provided with movable holes 220, the outer surfaces of the eight fixed rods 217 are movably embedded in the eight movable holes 220 near one end, the outer surfaces of the eight movable frames 218 are fixedly installed with four limit blocks 225, and the two sides of the interior of the eight fixed blocks 215 are provided with limit grooves 226. The multiple limit blocks 225 are grouped into two limit blocks 225 distributed vertically, and the outer surfaces of the sixteen groups of limit blocks 225 are movably embedded in the sixteen limit grooves 226, and the bottom of the simulation table 201 is fixedly installed on the top of the base plate 1.

[0038] In this embodiment, when in use, the controller 202 and the three-axis electromagnetic vibration table 203 are electrically connected, the electric push rod 402, the vibration sensor 406 and the control system 204 are electrically connected, and a soil model similar to the on-site soil layer conditions is prepared in the first model box 205, including the type, density, water content and other parameters of the soil body, which should be as consistent as possible with the actual situation. Then the pile foundation model made in proportion is installed in the soil model, the strain gauge sensor is installed on the pile body surface of the pile foundation model to measure the strain of the pile body, so as to calculate the internal force of the pile body, the pore water pressure sensor is buried in the soil model around the pile foundation, and is used to monitor the changes in the pore water pressure in the soil. The displacement sensor is installed on the pile top of the pile foundation model to measure the displacement of the pile, including settlement, horizontal displacement, etc. The reinforcing rod 306 is pushed downward, so that the moving block 307 moves downward, and one end of the fixed rod 217 is pushed downward, so that the moving block 307 passes through the movable hole 220 and enters the fixed block 215. When the fixed rod 217 moves downward, it will drive the moving frame 218 to move downward together and squeeze the spring 219, and at the same time, the other end of the fixed rod 217 moves from the fixed groove 223 to the inside of the fixed block 215. At this time, the connection between the blocking plate 221 and the fixed block 215 is lost. When the rotating disk at the top of the reinforcing rod 306 contacts the rotating rod 304, the card column 308 enters the fixed block 215 together with the moving block 307, and then the reinforcing rod 306 is rotated so that the top of the card column 308 is in the fixed The first model box 205 is rotated on the top surface inside the fixed block 215. When the clamping column 308 rotates to the top groove 224, the clamping column 308 and the moving block 307 lose their limit, and the spring 219 loses its extrusion. Under the elastic force of the spring 219, the moving block 307 is pushed upward, thereby pushing the clamping column 308 into the top groove 224. Repeat the above operation to clamp the other seven clamping columns 308 into the top groove 224. With the cooperation of the fixing component 3, the first model box 205 is fixed on the three-axis electromagnetic vibration table 203 to prevent the first model box 205 from moving during the subsequent loading process. This installation method will not cause damage to the table of the three-axis electromagnetic vibration table 203 and will not affect the normal operation of the three-axis electromagnetic vibration table 203. Then start the three-axis electromagnetic vibration table 203 to generate vibrations in different directions, so that the first model box 205 can be subjected to multi-directional vibration excitation, and truly simulate the effects of seismic waves in different directions. During the loading process, the control system 204 receives various signals collected by the sensors, such as strain signals, pore water pressure signals, displacement signals, etc., and converts these analog signals into digital signals. The computer software stores, analyzes and processes the collected data, draws corresponding data curves, and analyzes the anti-seismic liquefaction performance of the pile foundation through these curves, thereby evaluating it.With the cooperation of the evaluation component 2 and the fixing component 3, after completing the evaluation of the earthquake-resistant liquefaction performance of the pile foundation, the reinforcing rod 306 is pushed downward again, so that the moving block 307 pushes the fixing rod 217 to move downward again, and drives the moving frame 218 to move, and squeezes the spring 219, further pushing the clamping column 308 out of the top groove 224, and then rotating the reinforcing rod 306 so that the moving block 307 is kept flush with the movable hole 220, and then slowly releases the pressure applied to the reinforcing rod 306, and follows the elastic force of the spring 219 to push the moving block 307 out of the fixing block 215, and the connection between the rotating rod 304 and the fixing block 215 is lost, and then the rotating rod 304 is pushed outward to make it leave the top of the fixing block 215, so that the first model box 205 can be removed from the top of the three-axis electromagnetic vibration table 203, thereby achieving the effect of convenient disassembly, the process is simple, does not require the help of other tools, reduces time, and solves the problem of using bolts to connect the model box to the table top of the earthquake simulation equipment during the evaluation of the earthquake-resistant liquefaction performance of the pile foundation. However, this fixing method will cause certain damage to the table top of the earthquake simulation equipment. The subsequent disassembly process is relatively troublesome and requires the use of tools to remove the bolts one by one, which is time-consuming.

[0039] Embodiment 2: Figure 1-Figure 9As shown, an evaluation component 2 is arranged on the top of the bottom plate 1, a fixing component 3 is arranged on the outer surface of the evaluation component 2, an auxiliary component 4 is arranged on the outer surface of the fixing component 3, a control system 204 is arranged on the outer surface of the bottom plate 1, and the auxiliary component 4 includes four mounting plates 401, electric push rods 402 are fixedly installed on the outer surface of one side of the four mounting plates 401 near the top, push-pull plates 403 are fixedly installed on one end of the four electric push rods 402, push-pull rods 404 are fixedly installed on the tops of the four push-pull plates 403 near the two sides, and two slide bars 405 are fixedly installed on the outer surfaces of the four push-pull plates 403. The eight slide bars 405 Each two adjacent slide bars 405 form a group, and one end of the four groups of slide bars 405 are movable and penetrate the outer surfaces of the four mounting plates 401 respectively. A vibration sensor 406 is set on the front surface of the first model box 205. Eight fixed blocks 215 form a group of two each. The bottom of the four groups of fixed blocks 215 are all provided with a guide frame 5, and the bottom of the four guide frames 5 are all fixedly installed with two support rods 6. The four side outer surfaces of the first model box 205 are all provided with flow holes 212 near the bottom, and the four side outer surfaces of the first model box 205 are all fixedly installed with connecting plates 213 near the flow holes 212. The outer surfaces of the four connecting plates 213 are A sealing groove 214 is provided, and a sealing plate 221 is movably embedded in the interior of the four sealing grooves 214. A sealing plate 222 is fixedly installed on the outer surface of one side of the four sealing plates 221. The outer surfaces of the four sealing plates 222 are movably embedded in the interior of the four connecting plates 213 respectively. Two pull rings 227 are fixedly connected to the outer surface of the other side of the four sealing plates 221. A fixing groove 223 is provided at the bottom of the four sealing plates 221 near both sides. A card slot 216 is provided at the outer surface of one side of the eight fixing blocks 215 near the top. Each horizontally distributed two card slots 216 of the eight card slots 216 form a group, and the four The outer surfaces of both sides of the blocking plates 221 are movably embedded in the four groups of slots 216 near the top, the other ends of the eight fixing rods 217 are movably inserted into the eight slots 216, the other ends of the eight fixing rods 217 are movably embedded in the eight fixing slots 223, the four mounting plates 401 are respectively installed on the four side outer surfaces of the base plate 1 by bolts, the outer surfaces of the eight push-pull rods 404 are respectively movably embedded in the eight pull rings 227, the bottom ends of the eight support rods 6 are all fixedly installed on the top of the base plate 1, and the tops of the four lead-out frames 5 are respectively in contact with the bottoms of the four connecting plates 213.

[0040] In this embodiment, when in use, the other end of the fixing rod 217 is removed from the fixing groove 223 by the fixing assembly 3. When the three-axis electromagnetic vibration table 203 is started, the first model box 205 is vibrated, and the vibration sensor 406 is started in advance. The first model box 205 is detected by the vibration sensor 406, and the detected vibration data is transmitted to the control system 204 in the form of an electrical signal for identification and comparison. When the vibration data exceeds the set minimum vibration value, the control system 204 controls the four electric push rods 402 to start, pull the push-pull plate 403 outward, and pull the blocking plate 221 out of the sealing groove 214 and the sealing plate 222 out of the connecting plate 213 through the cooperation of the push-pull rod 404 and the pull ring 227. At this time, the connecting plate 213 loses its seal with the flow hole 212. During the earthquake simulation, when the soil model in the first model box 205 is liquefied by vibration, it will diffuse and flow outward through multiple flow holes 212 and connecting plates 213. A soil receiving box can be set at the bottom of the lead-out frame 5, and the outflowing liquid soil can be guided to the soil receiving box through the lead-out frame 5, reducing the subsequent cleaning work. Under the action of the auxiliary component 4, the liquefied soil is allowed to flow out naturally, simulating the liquefaction phenomenon in the real geological environment, which is conducive to improving the authenticity of the assessment. The flowing soil flows outward through the flow holes 212 and the connecting plates 213, which can also reduce the stress concentration inside the soil and prevent uneven stress distribution, thereby more realistically reflecting the mechanical behavior under liquefaction conditions.

[0041] Embodiment 3: Figure 1-Figure 5 As shown, an evaluation component 2 is arranged on the top of the bottom plate 1, a fixing component 3 is arranged on the outer surface of the evaluation component 2, a second model box 206 is arranged on the top of the first model box 205, a card plate 207 is fixedly installed on the top of the first model box 205 and the top of the second model box 206, a sealing strip 208 is fixedly connected to the top of the two card plates 207, a sleeve plate 209 is fixedly connected to the bottom of the second model box 206, a plurality of plug rods 210 are fixedly installed on the bottom of the sleeve plate 209, a top of one sealing strip 208 is in contact with the bottom of the second model box 206, a bottom of the sleeve plate 209 is in contact with the top of the first model box 205, a plurality of slots 211 are opened on the top of the first model box 205 and the top of the second model box 206, and the outer surfaces of the plurality of plug rods 210 are movably embedded in the plurality of slots 211 respectively.

[0042] In this embodiment, when in use, the second model box 206 can be installed on the top of the first model box 205 by inserting the insertion rod 210 at the bottom of the second model box 206 into the slot 211 at the top of the first model box 205. The width of the insertion rod 210 matches the width inside the slot 211, and the insertion rod 210 can be tightly inserted into the slot 211. Under the sealing effect of the sealing strip 208, the sealing between the first model box 205 and the second model box 206 is improved. The first model box 205 and the second model box 206 are arranged to be spliced. The evaluator can choose the number of the second model boxes 206 according to the actual situation. By splicing different numbers of second model boxes 206, the overall depth can be increased to simulate soil and pile foundations of different depths, thereby meeting the evaluation requirements of pile foundations of different depths.

[0043] The effect and working principle of the whole mechanism are as follows: a soil model similar to the on-site soil conditions is prepared in the first model box 205, and then a pile foundation model made in proportion is installed in the soil model, a strain gauge sensor is installed on the pile body surface of the pile foundation model, a pore water pressure sensor is buried in the soil model around the pile foundation, and a displacement sensor is installed on the pile top of the pile foundation model to measure the displacement of the pile. The reinforcing rod 306 is pushed downward, so that the moving block 307 moves downward, and one end of the fixed rod 217 is pushed downward, so that the moving block 307 passes through the movable hole 220 and enters the fixed block 215. When the fixed rod 217 moves downward, it will drive the moving frame 218 to move downward together and squeeze the spring 219, and at the same time, the other end of the fixed rod 217 moves from the fixed groove 223 to the inside of the fixed block 215. At this time, the connection between the blocking plate 221 and the fixed block 215 is lost. When the rotating disk at the top of the reinforcing rod 306 contacts the rotating rod 304, the card column 308 enters the fixed block 215 together with the moving block 307, and then the reinforcing rod 306 is rotated so that the top of the card column 308 is in the fixed The first model box 205 is rotated on the top surface inside the fixed block 215. When the clamping column 308 rotates to the top groove 224, the clamping column 308 and the moving block 307 lose their limit, and the spring 219 loses its extrusion. Under the elastic force of the spring 219, the moving block 307 is pushed upward, thereby pushing the clamping column 308 into the top groove 224. Repeat the above operation to clamp the other seven clamping columns 308 into the top groove 224. With the cooperation of the fixing component 3, the first model box 205 is fixed on the three-axis electromagnetic vibration table 203 to prevent the first model box 205 from moving during the subsequent loading process. This installation method will not cause damage to the table of the three-axis electromagnetic vibration table 203 and will not affect the normal operation of the three-axis electromagnetic vibration table 203. Then start the three-axis electromagnetic vibration table 203 to generate vibrations in different directions, so that the first model box 205 can be subjected to multi-directional vibration excitation, and truly simulate the effects of seismic waves in different directions. During the loading process, the control system 204 receives various signals collected by the sensor, such as strain signals, pore water pressure signals, displacement signals, etc., and converts these analog signals into digital signals. The collected data is stored, analyzed and processed by computer software, and the corresponding data curves are drawn. The pile foundation anti-seismic liquefaction performance is analyzed through these curves, so as to be evaluated. At the same time, the first model box 205 is detected by the vibration sensor 406, and the detected vibration data is transmitted to the control system 204 in the form of electrical signals for identification and comparison. When the vibration data exceeds the set minimum vibration value, the control system 204 will control the four electric push rods 402 to start, pull the push-pull plate 403 to move outward, and pull the plugging plate 221 out of the sealing groove 214 and the sealing plate 222 out of the connecting plate 213 through the cooperation of the push-pull rod 404 and the pull ring 227. At this time, the connecting plate 213 loses its seal with the flow hole 212.During the earthquake simulation, when the soil model in the first model box 205 is liquefied by vibration, it will diffuse and flow outward through the multiple flow holes 212 and the connecting plate 213. A soil receiving box can be provided at the bottom of the lead-out frame 5, and the outflowing liquid soil can be guided to the soil receiving box through the lead-out frame 5. Under the action of the auxiliary component 4, the liquefied soil is allowed to flow out naturally, simulating the liquefaction phenomenon in the real geological environment, which is conducive to improving the authenticity of the assessment. After completing the evaluation of the anti-seismic liquefaction performance of the pile foundation, push the reinforcement rod 306 downward again, so that the moving block 307 pushes the fixed rod 217 to move downward again, and drives the moving frame 218 to move, and squeezes the spring 219, further pushing the column 308 out from the top groove 224, and then rotate the reinforcement rod 306 to make the moving block 307 keep flush with the movable hole 220, and then slowly release the pressure applied to the reinforcement rod 306, follow the elastic force of the spring 219, and push the moving block 307 out from the inside of the fixed block 215, the connection between the rotating rod 304 and the fixed block 215 is lost, and then push the rotating rod 304 outward to make it leave the top of the fixed block 215, so that the first model box 205 can be removed from the top of the three-axis electromagnetic vibration table 203, so as to achieve the effect of convenient disassembly, and the process is simple, does not require the help of other tools, and reduces time. The second model box 206 can be installed on the top of the first model box 205 by tightly inserting the insertion rod 210 into the slot 211 on the top of the first model box 205. Under the sealing effect of the sealing strip 208, the sealing between the first model box 205 and the second model box 206 is improved. The first model box 205 and the second model box 206 are configured to be spliced. The assessor can choose the number of the second model boxes 206 according to actual conditions. By splicing different numbers of second model boxes 206, the overall depth can be increased to simulate soil and pile foundations of different depths, thereby meeting the assessment requirements of pile foundations of different depths.

[0044] Among them, the controller 202, the three-axis electromagnetic vibration table 203, the electric push rod 402, the vibration sensor 406 and the control system 204 are all existing technologies, and their components and operating principles are all public technologies, which will not be explained in detail here.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pile foundation anti-seismic liquefaction performance evaluation instrument, comprising a base plate (1), characterized in that: An evaluation component (2) is arranged on the top of the bottom plate (1), a fixing component (3) is arranged on the outer surface of the evaluation component (2), and an auxiliary component (4) is arranged on the outer surface of the fixing component (3); The evaluation component (2) comprises a simulation table (201), a three-axis electromagnetic vibration table (203) is arranged on the top of the simulation table (201), a first model box (205) is arranged on the top of the three-axis electromagnetic vibration table (203), two fixed blocks (215) are fixedly installed on the outer surfaces of four sides of the first model box (205) near the bottom, eight fixed blocks (215) are movably embedded with fixed rods (217) inside, mobile racks (218) are fixedly installed on the outer surfaces of the eight fixed rods (217), the bottoms of the eight mobile racks (218) are fixedly connected with springs (219), and the top surfaces of the eight fixed blocks (215) are provided with two top grooves (224); The fixing assembly (3) comprises a fixing plate (301), four mounting blocks (302) are fixedly mounted on the outer surfaces of four sides of the fixing plate (301), two mounting blocks (302) distributed laterally form a group of sixteen mounting blocks (302), damping shafts (303) are arranged inside eight groups of mounting blocks (302), two damping shafts (303) form a group, rotating rods (304) are arranged on the outer surfaces of the four groups of damping shafts (303), and two fastening holes (305) are arranged near the top of the outer surfaces of the four rotating rods (304); A reinforcement rod (306) is movably embedded in the interior of the eight fastening holes (305), a moving block (307) is fixedly installed at the bottom end of the eight reinforcement rods (306), and two clamping columns (308) are fixedly installed at the top of the eight moving blocks (307); One end of the eight springs (219) is fixedly mounted on the bottom surface of the eight fixed blocks (215), and the top of the eight fixed blocks (215) is provided with a movable hole (220). The outer surfaces of the eight fixed rods (217) are movably embedded in the eight movable holes (220) near one end, and the outer surfaces of the eight movable frames (218) are fixedly mounted with four limit blocks (225). Both sides of the interior of the eight fixed blocks (215) are provided with limiting grooves (226); each of the plurality of limiting blocks (225) is composed of two limiting blocks (225) distributed vertically, and the outer surfaces of the sixteen groups of limiting blocks (225) are movably embedded in the sixteen limiting grooves (226), respectively; and the bottom of the simulation platform (201) is fixedly mounted on the top of the bottom plate (1); Flow holes (212) are provided on the outer surfaces of the four sides of the first model box (205) near the bottom, connecting plates (213) are fixedly installed on the outer surfaces of the four sides of the first model box (205) near the flow holes (212), sealing grooves (214) are provided on the outer surfaces of the four connecting plates (213), sealing plates (221) are movably embedded in the four sealing grooves (214), sealing plates (222) are fixedly installed on the outer surfaces of one side of the four sealing plates (221), the outer surfaces of the four sealing plates (222) are movably embedded in the four connecting plates (213), and the outer surfaces of the other sides of the four sealing plates (221) are fixedly connected to two pull rings (227); The bottoms of the four blocking plates (221) are provided with fixing grooves (223) near both sides, and the outer surfaces of one side of the eight fixing blocks (215) are provided with clamping grooves (216) near the top. The eight clamping grooves (216) are grouped into two horizontally distributed clamping grooves (216). The outer surfaces of both sides of the four blocking plates (221) are movably embedded in the four groups of clamping grooves (216) near the top. The other ends of the eight fixing rods (217) are movably inserted into the eight clamping grooves (216), and the other ends of the eight fixing rods (217) are movably embedded in the eight fixing grooves (223).

2. The pile foundation anti-seismic liquefaction performance evaluation instrument according to claim 1, characterized in that: The interior of the fixing plate (301) is fixedly mounted on the outer surface of the simulation platform (201) near the top, a controller (202) is arranged inside the simulation platform (201), and a control system (204) is arranged on the outer surface of the bottom plate (1).

3. The pile foundation anti-seismic liquefaction performance evaluation instrument according to claim 1, characterized in that: A second model box (206) is arranged on the top of the first model box (205); a cardboard (207) is fixedly installed on the top of the first model box (205) and the top of the second model box (206); a sealing strip (208) is fixedly connected to the top of the two cardboards (207); a sleeve plate (209) is fixedly connected to the bottom of the second model box (206); a plurality of insertion rods (210) are fixedly installed on the bottom of the sleeve plate (209); a top of one of the sealing strips (208) contacts the bottom of the second model box (206); a bottom of the sleeve plate (209) contacts the top of the first model box (205); a plurality of slots (211) are provided on the top of the first model box (205) and the top of the second model box (206); outer surfaces of the plurality of insertion rods (210) are movably embedded in the plurality of slots (211), respectively.

4. The pile foundation anti-seismic liquefaction performance evaluation instrument according to claim 1, characterized in that: The auxiliary component (4) comprises four mounting plates (401), electric push rods (402) are fixedly mounted on the outer surfaces of one side of the four mounting plates (401) near the top, push-pull plates (403) are fixedly mounted on one end of the four electric push rods (402), push-pull rods (404) are fixedly mounted on the tops of the four push-pull plates (403) near both sides, and two sliding rods (405) are fixedly mounted on the outer surfaces of the four push-pull plates (403).

5. The pile foundation anti-seismic liquefaction performance evaluation instrument according to claim 4, characterized in that: Each adjacent two sliding bars (405) of the eight sliding bars (405) form a group, one end of the four groups of sliding bars (405) are movably connected to the outer surfaces of the four mounting plates (401), a vibration sensor (406) is arranged on the front surface of the first model box (205), each two of the eight fixing blocks (215) form a group, a guide frame (5) is arranged at the bottom of the four groups of fixing blocks (215), and two support rods (6) are fixedly installed at the bottom of the four guide frames (5).

6. The pile foundation anti-seismic liquefaction performance evaluation instrument according to claim 5, characterized in that: The four mounting plates (401) are respectively mounted on the four side outer surfaces of the base plate (1) by means of bolts, the outer surfaces of the eight push-pull rods (404) are respectively movably embedded in the interiors of the eight pull rings (227), the bottom ends of the eight support rods (6) are all fixedly mounted on the top of the base plate (1), and the tops of the four lead-out frames (5) are respectively in contact with the bottoms of the four connecting plates (213).

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