Soil foundation shear force and bearing capacity evaluation device based on porosity test

Abstract

The present invention discloses a soil base shear force and bearing capacity evaluation device based on porosity testing, which belongs to the field of engineering geological testing technology, including a stripping mechanism, a permeable stone feeding assembly and a direct shear apparatus; a sample preparation mechanism is used to cut samples and compact the samples inside the ring knife; the stripping mechanism is used to separate the samples made by the sample preparation mechanism from the ring knife; the permeable stone feeding assembly is used to place the permeable stone on both sides of the sample; the direct shear apparatus is used to detect the mechanical parameters of the sample; the sample preparation mechanism and the stripping mechanism are transferred between the sample preparation mechanism and the stripping mechanism via a linear conveying module. The sample preparation mechanism includes a ring cutting assembly, a flattening assembly and a sample carrier for placing the sample; the ring cutting assembly collects the sample through the ring knife; the flattening assembly is used to remove the excess sample at both ends of the ring knife. The present invention solves the technical problem of complicated and inefficient soil sample preparation and processing procedures when testing the soil base shear resistance and consolidation bearing performance. The equipment can realize a standardized sample preparation process and improve the qualified rate of sample preparation.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering geological detection, and in particular to a soil foundation shear force and bearing capacity evaluation device based on porosity testing. Background Art

[0002] In the construction of roads in coastal areas, a large amount of geotechnical materials often need to be transported from the inland, which greatly increases the construction cost and construction period. How to comprehensively utilize geotechnical resources according to actual conditions to meet the basic requirements of road construction in coastal areas is the key to the problem. Using dredged soil to fill the roadbed by blowing is a new experiment and exploration in the process of road construction in coastal areas. This not only solves the problems of land occupation and environmental pollution caused by dredged soil discharge, but also has an important impact on my country's infrastructure construction and comprehensive resource utilization.

[0003] Of course, in order to actually apply the blown fill to the roadbed and meet the national design standards, it must be reasonably reinforced. Whether the bearing capacity of the reinforced fill foundation can meet the standard requires a lot of testing and experimental analysis. Domestic scholars have carried out a large number of indoor experimental studies on the fill foundation in some parts of my country. The performance of the fill foundation is directly affected by the porosity ratio. The shear test and consolidation test of the foundation based on the porosity ratio are the key to the foundation performance test. In the existing technology, most of the shear strength and consolidation characteristics of the fill foundation are tested using a direct shear apparatus. During the test, fill foundation samples of the road section to be tested need to be taken for direct shear test and consolidation bearing test. However, the early processing and sample preparation of the samples require a lot of time and manpower. Usually, the test personnel press the ring knife into the soil sample from the top of the sample, and then cut off the excess soil sample at both ends of the ring knife and the outer circumference. Then, the ring knife is placed and aligned with the upper and lower boxes of the shear container and the sample in the ring knife is pushed into the shear box. During this process, two permeable stones need to be placed at the upper and lower ends of the sample respectively. Finally, the shear container is placed in the corresponding position of the direct shear apparatus to start the direct shear test and consolidation test. This sample preparation process is inevitable and complicated, and is also one of the factors affecting test efficiency.

[0004] Therefore, the present invention provides a soil foundation shear force and bearing capacity evaluation device and evaluation method based on porosity testing, which realizes the automation and standardization of test soil sample preparation and processing, improves soil sample preparation efficiency, and accelerates testing progress. Summary of the Invention

[0005] In order to address the shortcomings of the existing technology, the purpose of the present invention is to provide a soil base shear force and bearing capacity evaluation device based on porosity testing, so as to solve the problems of low sample preparation efficiency and low sample preparation yield in the soil base shear force and bearing capacity evaluation of porosity testing in the existing technology.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] Soil foundation shear force and bearing capacity evaluation device based on porosity test, including, stripping mechanism, permeable stone feeding assembly and direct shear apparatus;

[0008] The sample preparation mechanism is used to cut the sample and compact it inside the ring cutter;

[0009] The knife-stripping mechanism is used to separate the sample prepared by the sample preparation mechanism from the ring knife;

[0010] The permeable stone loading assembly is used to place the permeable stone on both sides of the specimen;

[0011] Direct shear apparatus is used to test the mechanical parameters of the specimen;

[0012] The sample is transferred between the sample preparation mechanism and the knife stripping mechanism through a linear conveying module.

[0013] Among them, in order to facilitate rapid sample preparation, the sample preparation mechanism includes a ring cutting component, a flattening component and a sample carrier for placing the sample; the ring cutting component collects the sample through the ring knife; the flattening component is used to remove the excess sample at both ends of the ring knife.

[0014] Preferably, the circular cutting assembly includes an electromagnetic knife holder and a sample stripping ring matching the outer contour of the circular knife; the electromagnetic knife holder is driven up and down by the sampling rack, and the sample stripping ring is driven up and down by the sample stripping rack; the electromagnetic knife holder attracts the circular knife by magnetic force;

[0015] The sampling rack and the sample removal rack are respectively engaged with the two sides of the gear, and the gear is driven up and down by the actuator cylinder; the gear is driven to rotate by the drive motor, and the gear is connected to the actuator cylinder through the gear seat, and the drive motor is installed on the gear seat;

[0016] After the sampling is completed, the sample stripping ring is used to remove excess sample from the outer surface of the ring knife.

[0017] In order to flatten the two ends of the sample, the sample preparation mechanism also includes a flattening component and a sample carrier. The flattening component includes a clamping and flipping module and an electric cutter. The sample carrier is used to transport the ring cutter separated from the electromagnetic cutter holder to the clamping and flipping module; the clamping and flipping module is used to clamp the ring cutter and flip it to a horizontal state.

[0018] The electric cutter is used to cut off the excess samples at both ends of the ring knife in a horizontal state.

[0019] Preferably, the clamping and flipping module slides longitudinally relative to the electric sharpener via a guide slide, and the guide slide is provided with an L-shaped angle seat;

[0020] The electric sharpener is connected to an L-shaped lever that moves synchronously with the electric sharpener. One end of the L-shaped lever is connected to the clamping and flipping module, and the other end is engaged with the L-shaped angle seat.

[0021] When the electric sharpener moves downward to a certain position, the L-shaped support rod drives the guide slide through the L-shaped angle seat to move from the conveying end of the sample carrier to the cutting range of the electric sharpener;

[0022] When the electric sharpener moves upward to the top, the L-shaped support rod is disengaged from the L-shaped angle seat, and the L-shaped angle seat drives the guide slide to move longitudinally to the conveying range of the sample carrier.

[0023] In order to facilitate the transportation and separation of samples, a linear conveying module for conveying samples and shear boxes is set between the sample preparation mechanism and the knife stripping mechanism. The linear conveying module conveys the samples processed by the sample preparation mechanism through a lifting receiving platform; the lifting receiving platform includes a box seat for placing the shear box and a lifting cylinder for driving the box seat to rise and fall.

[0024] The stripping mechanism includes a punch head and a stripping plate. The stripping plate is symmetrically mounted on the support base. A stripping edge matching the punch head is provided in the stripping plate.

[0025] The lower end of the punching head is equipped with a magnetic suction head; the diameters of the magnetic suction head and the punching head are smaller than or equal to the inner diameter of the ring knife.

[0026] In order to facilitate the installation of permeable stones, the permeable stone loading assembly includes two sets of loading clamps driven by a synchronous belt group. The loading clamps are driven by a bidirectional slide. The bidirectional slide cooperates with the bow guide groove. The bow guide groove drives the two loading clamps to slide alternately along the bow guide groove.

[0027] The sample carrier includes a sample recovery box for placing samples, a guide frame for guiding the sliding of the sample recovery box, and a sample box push rod for driving the sample recovery box to slide along the guide frame. The sample recovery box is also provided with a recovery cavity for recovering excess samples.

[0028] The sample and shear box are transferred between the permeable stone loading assembly and the direct shear apparatus via a handling manipulator.

[0029] In order to facilitate the recovery of the ring knife, a movable knife box is provided directly below the knife stripping plate.

[0030] The beneficial effects achieved by the present invention are:

[0031] Compared with the existing technology, the present invention solves the technical problem of complicated and inefficient soil sample preparation and processing procedures when testing the shear resistance and consolidation bearing capacity of the soil base. The equipment can realize a standardized sample preparation process and improve the qualified rate of sample preparation. Especially when the soil sample is ring-cut, it is required to ensure that the two ends of the soil sample are flush after ring cutting and the soil sample outside the ring knife is cleaned. In addition, how to place the soil sample in the shear box after ring cutting and realize the separation of the ring knife and the soil sample; how to place the permeable stone at both ends of the soil sample when placing the soil sample; how to take out the ring knife after separation, etc. all require personnel to operate, and the operation by the test personnel is inevitably inefficient. If they are not careful, they may forget or miss the permeable stone, which will affect the test results. Furthermore, preparing a complete sample is also one of the difficulties. In actual operation, the sample is often unevenly pressed or falls apart after leaving the ring knife.

[0032] The present invention performs circular cutting on the test soil sample through a sample preparation mechanism. The sample preparation mechanism presses down the ring knife to insert the ring knife into the test soil sample, cleans the remaining sample outside the ring knife, and then removes the excess soil sample at both ends of the ring knife to complete the sample preparation. Then, the permeable stone is squeezed into the interior of the two ends of the ring knife through the permeable stone feeding assembly, and the permeable stone is pushed to the bottom of the shear box by the stripping mechanism. Then, the shear box is transferred to the sample preparation mechanism to receive the sample through the linear conveying module and the jacking receiving platform, and then transferred to the stripping mechanism, and the stripping mechanism separates the ring knife and the sample. The present invention can achieve continuous operation through an external manipulator, and is particularly suitable for large-scale testing.

[0033] The present invention does not require excessive manpower and energy, effectively improves sample preparation efficiency, and shortens test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0035] Figure 2 This is the main structure front view of the present invention;

[0036] Figure 3 It is a top view of the main structure of the present invention;

[0037] Figure 4 The sample preparation mechanism of the present invention is three-dimensional Figure 1 ;

[0038] Figure 5 The sample preparation mechanism of the present invention is three-dimensional Figure 2 ;

[0039] Figure 6 This is a structural diagram of the sample carrier of the present invention;

[0040] Figure 7 This is a front view of the sample preparation mechanism of the present invention;

[0041] Figure 8 This is a structural diagram of the knife-stripping mechanism and the jacking receiving platform of the present invention;

[0042] Figure 9 The present invention is a three-dimensional permeable stone feeding assembly Figure 1 ;

[0043] Figure 10 The present invention is a three-dimensional permeable stone feeding assembly Figure 2 ;

[0044] Figure 11 This is a structural diagram of the ring cutter chuck and the sample carrier of the present invention;

[0045] The meanings of the reference numerals in the figure are as follows: 1-direct shear apparatus; 2-sample preparation mechanism; 3-knife stripping mechanism; 4-linear conveying module; 5-lifting receiving platform; 6-permeable stone feeding assembly; 7-knife collecting box; 8-handling manipulator; 21-circular cutting assembly; 22-flattening assembly; 23-sample carrier; 201-sample preparation boss; 211-electromagnetic knife holder; 212-sample stripping ring; 213-sampling rack; 215-mounting frame; 216-gear; 217-sample stripping rack; 218-gear seat; 219-executing cylinder; 231-sample box push rod; 232-guide frame; 233-sample recovery box; 234-hinged rod Group; 235-back plate; 221-clamping and flipping module; 222-electric sharpener; 223-guide slide; 224-lifting plate; 225-guide rod group; 226-push rod 2; 227-L-shaped back rod; 228-L-shaped angle seat; 2211-flipping frame; 2212-flipping motor; 2213-ring knife chuck; 24-ring knife; 31-punching head; 32-push rod 3; 33-knife stripping plate; 34-support seat; 35-magnetic suction head; 36-knife stripping edge; 51-box seat; 52-lifting cylinder; 61-bow guide groove; 62-bidirectional slide; 63-loading clamp; 612-synchronous belt group. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] like Figures 1 to 3 As shown: This embodiment discloses a soil foundation shear force and bearing capacity evaluation device based on porosity testing, including a sample preparation mechanism 2, a knife stripping mechanism 3, a permeable stone loading assembly 6, and a direct shear apparatus 1. The direct shear apparatus 1, which is the full name of the "direct shear tester," is an instrument used to perform direct shear tests on soil samples. It belongs to the prior art and will not be described in detail in this embodiment.

[0048] The sample preparation mechanism 2 is used to cut the sample and compact the sample inside the ring knife 24 ; the knife stripping mechanism 3 is used to separate the sample prepared by the sample preparation mechanism 2 from the ring knife 24 .

[0049] like Figures 4 to 7 As shown, the sample preparation mechanism 2 includes a circular cutting component 21, a flattening component 22 and a sample carrier 23 for placing samples; the circular cutting component 21 collects samples through a circular knife 24; the flattening component 22 is used to remove excess samples at both ends of the circular knife 24.

[0050] Specifically, the circular cutting assembly 21 includes an electromagnetic knife holder 211 and a sample removal ring 212 that matches the outer contour of the circular knife 24. The electromagnetic knife holder 211 is driven up and down by a sampling rack 213, while the sample removal ring 212 is driven up and down by a sample removal rack 217. The electromagnetic knife holder 211 magnetically attracts the circular knife 24. The sampling rack 213 and the sample removal rack 217 are respectively engaged with either side of a gear 216. The central axis of the gear 216 is fixed to the mounting bracket 215 by sliding up and down via a gear holder 218. The gear 216 is driven by a drive motor (not shown in the drawings), which is mounted on the gear holder 218. The mounting bracket 215 vertically guides the sampling rack 213 and the sample removal rack 217 via guide members. Thus, under the action of the gear 216, the sampling rack 213 and the sample removal rack 217 move in opposite directions in the vertical direction, thereby achieving opposite vertical movement of the electromagnetic knife holder 211 and the circular knife 24. The gear holder 218, driven by the actuator cylinder 219, moves up and down along the mounting bracket 215, adjusting the overall height of the sampling rack 213 and the sample removal rack 217 on the guide member so that the corresponding ring knife 24 and the sample removal ring 212 can be close to the sample below. The electromagnetic knife holder 211 absorbs and releases the iron ring knife 24 by turning it on and off. The sample removal ring 212 is used to remove excess sample from the outer surface of the ring knife 24 after the sample removal ring 212 completes sampling.

[0051] During sample preparation, the operator or manipulator places the soil sample to be cut on the sample carrier 23. At the same time, the operator or manipulator also adsorbs the ring knife 24 coated with vaseline inside and outside to the bottom of the electromagnetic knife holder 211. The cylinder 219 drives the gear seat 218, the drive motor and the gear 216 downward, thereby driving the sampling rack 213 and the sample removal rack 217 as a whole downward to the sample, completing the overall height adjustment. During sample preparation, the drive motor drives the gear 216 to rotate, pushing the sampling rack 213 and the ring knife 24 downward and gradually approaching the sample, while the sample removal rack 217 and the sample removal ring 212 will rise to avoid it. After the ring knife 24 is directly inserted into the sample and the bottom of the ring knife 24 hits the sample preparation boss 201 on the sample carrier 23, the electromagnetic knife holder 211 is powered off, and the ring knife 24 is embedded in the sample. The drive motor drives the gear 216 to reverse, moving the sample removal rack 217 and the sample removal ring 212 downward. The sample removal ring 212 pushes the soil sample outside the ring knife into the sample recovery box 233 in the sample carrier 23. At the same time, the sampling rack 213 and the electromagnetic knife holder 211 rise and separate from the ring knife and the sample. The motion relationship between the gear 216, the sampling rack 213 and the sample removal rack 217 is used to complete the up and down staggered motion of the ring knife 24 and the sample removal ring 212, respectively completing the initial cutting of the sample and the removal of excess sample.

[0052] The above-mentioned sample removal ring 212 is used to remove excess samples from the outside of the ring knife 24. Since the ring knife 24 is ring-shaped, it is also necessary to plasticize the uneven samples at both ends of the sample after sampling. For this reason, the sample preparation mechanism 2 of the present invention also includes a flattening component 22 and a sample carrier 23. The flattening component 22 includes a clamping and flipping module 221 and an electric cutter 222. The flipping module 221 includes a ring knife chuck 2213 for clamping the side of the ring knife 24. There are two ring knife chucks 2213. The ring knife 24 is clamped by the two ring knife chucks 2213 synchronously clamping and releasing. The outside of the ring knife chuck 2213 is fixed by a flip frame 2211, and the flip frame 2211 is driven to flip by a flip motor 2212. For the specific structure, please refer to Figure 4 and Figure 11 Regarding the clamping method and the flipping method, those skilled in the art may also adopt other clamping designs.

[0053] The electric shaving knife 222 can slide vertically to remove excess samples at both ends of the horizontal ring knife 24. The electric shaving knife 222 is installed at the bottom of the lifting plate 224, which is vertically guided by a guide rod group 225. At its upper end, a push rod 226 is provided to drive the lifting plate 224 up and down.

[0054] The sample carrier 23 is used to transport the ring knife 24 separated from the electromagnetic knife holder 211 to the clamping and flipping module 221; the clamping and flipping module 221 is used to clamp the ring knife 24 and flip it to a horizontal state. The sample carrier 23 includes a sample recovery box 233 for placing the sample, a guide frame 232 for guiding the sample recovery box 233 to slide (in the Y direction), and a sample box push rod 231 for driving the sample recovery box 233 to slide along the guide frame 232. The sample recovery box 233 is slidably connected to the guide frame 232 through a hinged rod group 234. A stop plate 235 is provided at the end of the guide frame 232. After the sample box push rod 231 pushes the sample recovery box 233 to the position where the stop plate 235 is located, the hinged rod group 234 abuts against the stop plate 235. The sample box push rod 231 continues to push to push the sample recovery box 233 upward, so that the center of the sample recovery box 233 lifts the sample to the position where the ring knife 24 is located; of course, after the preliminary sample preparation is completed, it is also beneficial for the ring knife 24 and the overall clamping and flipping of the sample preparation when the ring knife chuck 2213 moves to the top of the sample recovery box 233. A sample preparation boss 201 is provided at the center of the sample recovery box 233 for placing samples, and recovery cavities for recovering excess samples are also provided around the box.

[0055] The clamping and flipping module 221 slides longitudinally (in the Y direction in the accompanying drawings) relative to the electric sharpener 222 via a guide slide 223, which is equipped with an L-shaped angle seat 228. The electric sharpener 222 is connected to an L-shaped lever 227 that moves synchronously with it. One end of the lever 227 is connected to the clamping and flipping module 221, and the other end engages the L-shaped angle seat 228. Specifically, when the electric sharpener 222 moves downward to a certain position (the height at which the electric sharpener 222 approaches the annular blade 24), the L-shaped lever 227, via the L-shaped angle seat 228, drives the guide slide 223 longitudinally from the transport end of the specimen carrier 23 to the cutting range of the electric sharpener 222. The lever then rotates the annular blade 24 to a horizontal position via the clamping and flipping module 221. When the L-shaped angle seat 228 stops rotating, that is, the L-shaped support rod 227 stops moving downward, the electric sharpener 222 continues to move downward, so that the electric sharpener 222 can cut the end of the horizontally placed sample, thereby achieving the purpose of leveling the sample end.

[0056] When the electric sharpener 222 moves upward to the top, the L-shaped stop 227 disengages from the L-shaped angle seat 228, and the L-shaped angle seat 228 drives the guide slide 223 to move longitudinally into the conveying range of the sample carrier 23. The L-shaped angle seat 228 is driven by a torsion spring, which constantly maintains an elastic force that pushes the sample carrier 23 out of the cutting range of the electric sharpener 222.

[0057] When conducting sample experiments, permeable stones are needed. Permeable stones belong to the existing technology and their function is to drain the water in the sample by using their pores. The permeable stone loading assembly 6 of this embodiment is used to place the permeable stones on both sides of the sample. Figure 2 、 Figure 3 、 Figure 9 and Figure 10 . The permeable stone loading assembly 6 includes two groups of loading clamps 63 driven by the same synchronous belt group 612. The loading clamps 63 are driven by a bidirectional slide 62. The so-called bidirectional slide 62 means that the slide has the function of sliding in the X and Y directions. That is to say, the two loading clamps 63 are respectively connected to the two sides of the same synchronous belt that move in opposite directions. The bidirectional slide 62 cooperates with the arched guide groove 61, and the arched guide groove 61 drives the two loading clamps 63 to slide alternately along the arched guide groove 61, so that when the two loading clamps 63 meet, they can avoid each other through the corresponding arched guide groove 61. The sample is transferred between the permeable stone loading assembly 6 and the direct shear instrument 1 through the handling robot 8.

[0058] like Figure 8 As shown: In this embodiment, the linear conveying module 4 conveys the sample processed by the sample preparation mechanism 2 to the knife stripping mechanism 3 through the lifting receiving platform 5; the lifting receiving platform 5 includes a box seat 51 for placing the shear box and a lifting cylinder 52 for driving the box seat 51 to rise and fall.

[0059] The stripping mechanism 3 includes a punch head 31 and a stripping plate 33, which is symmetrically mounted on a support base 34. A stripping opening 36 is provided in the stripping plate 33, matching the punch head 31. A magnetic suction head 35 is mounted at the lower end of the punch head 31. The magnetic suction head 35 can pass through the ring blade 24, so the diameters of the magnetic suction head 35 and the punch head 31 are slightly smaller than or equal to the inner diameter of the ring blade 24. A removable blade storage box 7 is also located directly below the stripping plate 33.

[0060] The working process of this embodiment includes the following steps:

[0061] Step 1: Circumcision of soil samples

[0062] During sample preparation, the operator or manipulator places the soil sample to be cut on the sample carrier 23. At the same time, the operator or manipulator also adsorbs the ring knife 24 coated with vaseline inside and outside to the bottom of the electromagnetic knife holder 211. The cylinder 219 drives the gear seat 218, the drive motor and the gear 216 downward, thereby driving the sampling rack 213 and the sample removal rack 217 as a whole downward to the sample, completing the overall height adjustment. During sample preparation, the driving motor drives the gear 216 to rotate, pushing the sampling rack 213 and the ring knife 24 downward and gradually approaching the sample, while the sampling rack 217 and the sampling ring 212 will rise to avoid it. After the ring knife 24 is directly inserted into the sample and the bottom of the ring knife 24 hits the sampling boss 201 on the sample carrier 23, the electromagnetic knife holder 211 is powered off, and the ring knife 24 is embedded in the sample. The driving motor drives the gear 216 to reverse, and the sampling rack 217 and the sampling ring 212 move downward. The sampling ring 212 pushes the soil sample outside the ring knife downward into the sample recovery box 233 in the sample carrier 23. At the same time, the sampling rack 213 and the electromagnetic knife holder 211 rise to separate from the ring knife and the sample.

[0063] Step 2: Separate the remaining sample

[0064] After the bottom of the ring cutter 24 hits the sample preparation boss 201 on the sample carrier 23, the electromagnetic knife holder 211 is powered off, the ring cutter 24 is embedded in the sample, and the drive motor drives the gear 216 to reverse, moving the sample removal rack 217 and the sample removal ring 212 downward. The sample removal ring 212 pushes the soil sample on the periphery of the ring cutter downward into the sample recovery box 233 in the sample carrier 23. At the same time, the sampling rack 213 and the electromagnetic knife holder 211 rise to separate from the ring cutter and the sample, and the ring cutter 24 filled with the sample inside remains on the upper surface of the sample recovery box 233. The sample recovery box 233 then moves to the clamping range of the ring cutter chuck 2213 through the sample box push rod 231 and moves up to the inside of the ring cutter chuck 2213 and clamps the ring cutter.

[0065] Step 3: Flattening the ends of the specimen

[0066] The lifting plate 224 is pushed downward by the push rod 226, and the lifting plate 224 drives the L-shaped support rod 227 downward and abuts the L-shaped angle seat 228, so that the L-shaped angle seat 228 pulls the guide slide 223 connected to it to move directly below the electric sharpening knife 222. After the ring knife chuck 2213 rotates the ring knife 24 to a horizontal state, the electric sharpening knife 222 cuts off the excess sample at one end of the ring knife 24.

[0067] Then, the second push rod 226 drives the lifting plate 224 and the electric sharpener 222 to move upward, and then the ring knife chuck 2213 is flipped in the other direction again, so that the other end of the ring knife 24 is directly below the electric sharpener 222. Next, the second push rod 226 is pressed down again, repeating the above-mentioned action of the L-shaped support rod 227 moving downward and abutting the L-shaped angle seat 228, and the electric sharpener 222 removes the excess sample at the other end of the ring knife 24, completing the flattening of the sample at both ends of the ring knife 24.

[0068] Step 4: Place the permeable stone at the bottom of the box

[0069] The permeable stone is gripped by the loading gripper 63. Driven by the same synchronous belt assembly 612, the arched guide groove 61 is used to move the loading gripper 63 in the Y direction, allowing the two loading grippers 63 to alternately grip the permeable stones and place them at both ends of the sample. The first permeable stone is then pushed into the bottom of the shear box within the box seat 51 using the push rod 3 32 and the punch head 31. After the ring cutter 24 is placed within the shear box, the push rod 3 32 and the punch head 31 push the second permeable stone into the top of the ring cutter 24, completing the pressing of the sample. This seals the ring cutter 24 at both ends with the permeable stones, thus completing the sample within the ring cutter 24.

[0070] Step 5: Accept and transport the sample

[0071] The cassette holder 51 is pushed up and down by the lifting cylinder 52, and the linear conveying module 4 is used to switch the position of the lifting receiving platform 5 between the knife stripping position and the permeable stone loading assembly 6. When the sample is completed, the linear conveying module 4 moves the lifting receiving platform 5 and the shearing box to the bottom of the ring knife chuck 2213. The lifting cylinder 52 lifts the cassette holder 51, and the ring knife chuck 2213 releases the sample, so that the sample is placed just on top of the shearing box. Then the linear conveying module 4 drives the lifting receiving platform 5, the shearing box and the sample to the knife stripping position to realize the separation of the sample knife;

[0072] Step 6: Knife sample separation

[0073] When the linear conveying module 4 transfers the ring knife 24, the sample and the shear box to the bottom of the punching head 31 through the lifting receiving platform 5, the push rod 32 pushes the punching head 31 and the magnetic suction head 35 downward and pushes the sample away from the ring knife 24. The sample enters the shear box from then on. Then the push rod 32 drives the punching head 31 and the magnetic suction head 35 to retract. During the retraction process, the magnetic suction head 35 will absorb the ring knife 24, causing the ring knife 24 to leave the shear box. When the magnetic suction head 35 passes through the stripping opening 36, due to the large diameter of the ring knife 24, it cannot pass through the stripping opening 36. Under the blocking effect of the stripping plate 33, the ring knife 24 breaks away from the magnetic suction head 35 and falls into the interior of the knife receiving box 7 below. The knife receiving box 7 can transport the driven ring knife 24 and the magnetic suction head 35.

[0074] Then, the shear box and the sample are moved to the direct shear apparatus 1 for direct shear test. This moving process can be completed by other manipulators. After the direct shear test, a consolidation test can also be performed.

[0075] Compared with the existing technology, the present invention solves the technical problem of complicated and inefficient soil sample preparation and processing procedures when testing the shear resistance and consolidation bearing capacity of the soil base, especially when the soil sample is ring-cut, because it is required to ensure that the two ends of the soil sample are flush after ring cutting and the soil sample outside the ring knife 24 is cleaned. In addition, how to place the soil sample in the shear box after ring cutting and realize the separation of the ring knife 24 and the soil sample; how to place the permeable stone at both ends of the soil sample when placing the soil sample; how to take out the ring knife 24 after separation, etc. all require personnel to operate, and the operation by the test personnel is inevitably inefficient. If they are not careful, they may forget or miss the permeable stone, thereby affecting the test results. Furthermore, preparing a complete sample is also one of the difficulties. In actual operation, the sample is often unevenly pressed or falls apart after leaving the ring knife 24.

[0076] The present invention performs circular cutting of the test soil sample through the sample preparation mechanism 2. The sample preparation mechanism 2 presses down the ring knife 24 to insert the ring knife into the test soil sample, cleans the excess sample outside the ring knife 24, and then removes the excess soil sample at both ends of the ring knife 24 to complete the sample preparation. Then, the permeable stone is squeezed into the interior of the two ends of the ring knife 24 by the permeable stone feeding assembly 6. The permeable stone is pushed to the bottom of the shear box by the knife stripping mechanism 3. Subsequently, the shear box is transferred to the sample preparation mechanism 2 to receive the sample through the linear conveying module 4 and the jacking receiving platform 5, and then transferred to the knife stripping mechanism 3. The knife stripping mechanism 3 separates the ring knife 24 and the sample. The present invention can achieve continuous operation through an external manipulator, and is particularly suitable for large-scale testing.

[0077] The present invention requires too much manpower and energy, effectively improves the sample preparation efficiency, is conducive to standardizing the operation process, realizes accurate sample preparation, and shortens the test time.

[0078] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Soil foundation shear force and bearing capacity evaluation device based on porosity test, characterized in that: It includes a sample preparation mechanism, a knife stripping mechanism and a permeable stone loading assembly; the sample preparation mechanism includes a ring cutting assembly, a flattening assembly and a sample carrier for placing the sample; The circular cutting assembly includes an electromagnetic knife holder and a sample removal ring that matches the outer contour of the ring knife. The electromagnetic knife holder is driven up and down by the sampling rack, and the sample removal ring is driven up and down by the sampling rack. The electromagnetic knife holder attracts the ring knife through magnetic force. The sampling rack and the sample removal rack are respectively engaged with the two sides of the gear, and the gear is driven up and down by the actuator cylinder; the gear is driven to rotate by the drive motor, and the gear is connected to the actuator cylinder through the gear seat; The sample preparation mechanism also includes a flattening assembly and a sample carrier; the flattening assembly includes a clamping and flipping module and an electric cutter; the clamping and flipping module includes a ring cutter chuck for clamping the side of the ring cutter; The clamping and flipping module slides longitudinally relative to the electric sharpener through a guide slide, and the guide slide is provided with an L-shaped angle seat; The electric sharpener is connected to an L-shaped lever that moves synchronously with the electric sharpener. One end of the L-shaped lever is connected to the clamping and flipping module, and the other end is engaged with the L-shaped angle seat. A linear conveying module for conveying samples and shear boxes is provided between the sample preparation mechanism and the stripping mechanism. The linear conveying module conveys the samples processed by the sample preparation mechanism through a lifting receiving platform. The lifting receiving platform includes a box seat for placing the shear box and a lifting cylinder for driving the box seat to rise and fall; The stripping mechanism includes a punch head and a stripping plate; A magnetic suction head is installed at the lower end of the punching head; The permeable stone feeding assembly includes two sets of feeding clamps driven by a synchronous belt assembly. The feeding clamps are driven by a bidirectional slide. The bidirectional slide cooperates with the arched guide groove. The arched guide groove drives the two feeding clamps to slide alternately along the arched guide groove. The device comprises the following steps when in use: S1: The gear rotates to drive the ring cutter to press the soil sample downward, and the soil sample is stored inside the ring cutter; S2: The specimen carrier transports the ring cutter to the clamping range of the clamping and flipping module, and the ring cutter is clamped by the clamping and flipping module; S3: When the electric sharpener moves downward to a certain position, the L-shaped support rod drives the guide slide through the L-shaped angle seat to move longitudinally from the conveying end of the sample carrier to the cutting range of the electric sharpener, and the ring knife is rotated to a horizontal state through the clamping flip module; when the L-shaped angle seat stops rotating, the electric sharpener continues to move downward, so that the electric sharpener can cut the end of the horizontally placed sample, thereby achieving the purpose of leveling the sample end; S4: The permeable stone is taken by the loading clamp. Driven by the synchronous belt assembly, the arched guide groove is used to move the loading clamp in the Y direction, so that the two loading clamps can alternately clamp the permeable stones and place them at both ends of the sample; and the punch head is used to push the first permeable stone into the box seat to cut the bottom of the box; The punch head pushes the second permeable stone to the top of the ring cutter and completes the pressing of the sample; S5: The punch head and magnetic suction head move downward, pushing the sample away from the ring knife and into the shear box. Then the punch head and magnetic suction head retract. When the magnetic suction head passes the knife-off opening, the knife-off opening separates the ring knife from the magnetic suction head and drops it into the knife-receiving box below. S6: Move the shear box and specimen to the direct shear apparatus for direct shear test.

2. The soil foundation shear force and bearing capacity evaluation device for porosity testing according to claim 1 is characterized in that: In S1, after the soil sample is received inside the ring cutter, the gears rotate in the opposite direction to drive the sample removal ring downward to remove the soil sample outside the ring cutter.

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