85 results about "Shear strength test" patented technology

The invention discloses a steel slag improved marine facies sludge curing agent proportion determination method based on a response surface method, which comprises the following steps: carrying out a shear strength test on waste steel slag improved marine dredged sludge under a freezing and thawing cycle, and determining the optimal curing agent mixing amount of the marine dredged sludge; performing an unconfined compressive strength test based on the optimal mixing amount of the curing agent of the marine dredged sludge to obtain the optimal mixing amount range of each component of the curing agent; testing by taking the mixing amount of each component of the curing agent as a main variable and taking 7d compressive strength and 14d compressive strength as response amounts to obtain response value test results under different mixing ratios; performing nonlinear fitting on a response value test result, and establishing a response surface model; obtaining an expected value of each response quantity based on the response surface model; and obtaining the optimal mix proportion of the curing agent based on the expected value of each response amount. Under the condition of considering each index, the optimal mix proportion is found, and the overall performance and the construction effect are improved.

The utility model discloses a tool for testing the shear strength of a junction surface of a concrete mold and concrete. The tool comprises a first mounting seat and a second mounting seat, the two sets of first pressing blocks are provided with first surfaces used for making contact with post-pouring concrete, and the two sets of first pressing blocks are arranged on the first mounting base and can move oppositely or oppositely in the first direction; the first mounting base and the second mounting base can move relatively or oppositely in the second direction, and the second direction is perpendicular to the first direction; the two sets of second pressing blocks are provided with second surfaces used for making contact with the concrete mold, the two sets of second pressing blocks are arranged on the second mounting base, and the two sets of second pressing blocks can move oppositely or oppositely in the first direction; in the first direction, the outer side edge of the first surface can be aligned with the inner side edge of the second surface in the second direction. The testing tool can improve the accuracy of shear strength measurement of the junction surface of the concrete mold and the post-poured concrete.

The invention discloses a multi-scale research method for soil body strength degradation under the dry-wet cycle effect. The multi-scale research method comprises the following steps: S1, preparing a sample from collected test soil under the dry-wet cycle effect; s2, testing the macroscopic shear strength of the soil body by using the triaxial sample prepared in the step S1; s3, the cutting ring sample prepared in the step S1 is used for soil microcosmic fracture testing; s4, carrying out a soil body micro-pore test by utilizing the microstructure sample prepared in the step S1; and S5, analyzing the soil body strength degradation rule of the collected test soil under the dry-wet cycle action by using the test results of the soil body macroscopic shear strength test, the soil body microcosmic crack test and the soil body microcosmic pore test. According to the method, through multi-scale analysis, related enterprises can more comprehensively evaluate the degradation rule of the soil body under the dry-wet cycle effect, so that an engineering construction design scheme is optimized, and the risks of landslide, collapse and other engineering accidents caused by soil body strength reduction are reduced.

The invention belongs to the field of coal seam coal rock mechanical property testing, and particularly relates to an accurate fidelity testing method for three-resistance strength parameters of coal rock before heat injection and permeability increase. Comprising the following steps: S1, sample preparation; s2, testing equipment configuration; s3, environment control; testing in the testing cover, setting the temperature and humidity in the testing cover to be consistent with the original sample environment, setting the temperature fluctuation range to be less than or equal to + / -1 DEG C, and maintaining parameter stability through an automatic adjusting system; s4, testing compressive strength; loading at a constant speed of 0.5 MPa / s, recording a failure load and calculating compressive strength c = Fc / A; s5, tensile strength testing; stretching at the speed of 1MPa / s, recording the fracture load and calculating the tensile strength r = 2Fr / piDt; s6, testing the shear strength; loading shear force at a constant speed, recording a failure load and calculating shear strength; S7, analyzing data; and after abnormal values are removed, generating a strength parameter curve, and comparing mechanical property data in different stress states. The accurate fidelity testing method for the three-resistance strength parameters of the coal rock before coal seam heat injection and permeability increase has the advantages of being easy and convenient to operate, rapid in testing, accurate in data and the like.

The invention discloses a device and a method for testing torsion resistance or shear resistance of a recycled concrete beam test piece. The device comprises a first jack, and a force transmission gear is arranged on a piston rod of the first jack; the hoop is used for clamping a concrete test piece; a hoop gear is arranged on one side of the hoop, and the force transmission gear is meshed with the hoop gear, so that the hoop is driven to rotate through the lifting of the first jack, and the torsion damage of the concrete test piece is caused; the heating mechanism is used for heating the concrete test piece, and the second jack is used for applying pressure to the shaft end of the concrete test piece, so that the concrete test piece is in an axial pressure state; the third jack is used for applying pressure to the side, not provided with the hoop gear, of the hoop; the device can be used for testing the torsional strength and the shear strength of the concrete beam under the coupling action of high temperature and axial compression. The device is used for testing the torsional strength and the shear strength of the structure under the coupling action of high temperature and axial compression.

The present invention proposes a shear strength test device and a test method for titanium alloy laser wire-filled lap joints, which belongs to the field of mechanical property testing of titanium alloy lap joints. The present invention solves the problem that there is no shear strength test for titanium alloy laser wire-filled lap joints. There are two adjustment positioning plates, which are respectively arranged on both sides of the lap joint. There are two jaws, which are respectively arranged at both ends of the lap joint and the adjustment positioning plate. The lap joint is clamped with the adjustment positioning plate. The jaws are arranged in the jaw seat. The jaws are connected to the clamping cylinder. The jaws are clamped by the clamping cylinder. The clamping cylinder passes through the jaw seat and is connected to the wire column. The outer sides of the two adjustment positioning plates are provided with left and right positioning plates, and the upper and lower positioning plates are provided on the upper and lower sides of the adjustment positioning plate. It is mainly used for shear strength testing of titanium alloy laser wire-filled lap joints.

The present invention relates to the technical field of material mechanics testing, specifically an automated testing system and method for the shear strength of mine backfill. The system includes: a critical state identification module that collects real-time data of the shear force and shear displacement of the mine backfill during the shear strength test of the mine backfill, converts it into a curve representation, calculates the gradient mutation points of the curve, and marks the key state change positions during the shear process with reference to the gradient mutation points to obtain the parameter characteristics at the moment of shear failure. In the present invention, by collecting the dynamic data of the shear force and shear displacement in real time and converting them into a shear curve, accurately calculating the gradient mutation points in the curve, marking the key state changes during the shear process, and identifying the critical state where the material changes from shear bearing capacity to structural instability, it provides a key basis for the analysis of the shear strength.

The invention discloses a test fixture and a shear strength test system. The test fixture comprises a plurality of shear plates, two clamping blocks, a plurality of reinforcing sheets, a plurality of first-class mechanical fasteners and a plurality of second-class mechanical fasteners. The shear strength test system comprises a test fixture, a test piece to be tested and a testing machine, the to-be-tested test piece is used for being tightly connected into a mold sleeve piece formed by tightly connecting a plurality of shear plates through a plurality of reinforcing sheets of which the front and back surfaces are adhered to each non-impact damage area; and the testing machine is used for testing the shear strength of an impact damage area surrounded by each non-impact damage area on the to-be-tested test piece by applying a tensile load after establishing a connection relationship with the mold suite through the two clamping blocks. The test fixture provides reliable test support by means of the structure and the connection mode with good universality, and adapts to diversified test scenes in material science research and engineering application.

The invention provides a hierarchical mixture design index and optimization method according to functional requirements of different pavement layers (a surface layer, a middle surface layer and a lower surface layer) in combination with climate zoning and traffic load characteristics. According to the method, key mechanical parameters (the dynamic stability of a surface layer is greater than or equal to 6000 times / mm, and the low-temperature bending strain of a lower surface layer is greater than or equal to 2500 mu epsilon) are determined according to the horizon function, and then the mineral aggregate gradation and the special asphalt dosage are optimized through coupling analysis of volume parameters (the void ratio is 3%-5%, and the mineral aggregate void ratio is greater than or equal to 17%) and mechanical properties. And meanwhile, a bonding layer interface shear strength test (greater than or equal to 1.2 MPa) is introduced, so that the structural integrity is ensured.

The invention discloses a shear test device and method for a soil body in a drill hole, relates to the technical field of soil body shear strength tests, and aims to solve the problems of sampling disturbance, narrow application range, low test efficiency and the like in a traditional soil body shear strength test. The test device comprises a connecting rod, three groups of round rollers, a shearing assembly, a pressurizing assembly and a data acquisition assembly. The shearing assembly drives a shearing plate to be inserted into a soil body through a hydraulic jack for shearing, the pressurizing assembly applies horizontal radial pressure through an air bag to simulate different stress conditions, and the data collecting assembly records bending moment, rotating angle and pressure changes in real time. The test method comprises the following steps: drilling to a test depth, then installing the test device, pressing the shear plate, applying pressure, carrying out a shear test, and obtaining the friction angle and cohesive force in the soil body through data analysis. The in-situ test is directly carried out in the drill hole, sampling disturbance is avoided, the device is suitable for stratums difficult to sample such as sandy soil and fully-strongly weathered bedrock, and the device can go deep into different depths to research the mechanical properties of deep soil bodies.

The invention relates to the technical field of material mechanical property testing, and provides a tool device and a method for preparing a shear strength test sample, the tool device comprises at least two test tools, and each test tool is provided with a bonding surface and a through hole; a baffle assembly is arranged on the gluing tool, and a clamping groove is formed in the baffle assembly; when the testing tool is placed in the clamping groove, the height of the baffle assembly is larger than that of the bonding face, and the difference value between the height of the baffle assembly and the height of the bonding face is the thickness of the gluing layer. Mounting grooves are formed in the bonding tool, positioning convex blocks are arranged in the mounting grooves, and the positioning convex blocks are matched with the through holes; the pressurizing tool comprises a pressing plate and a connecting plate, and the connecting plate is vertically arranged below the pressing plate. According to the tool device for preparing the shear strength test sample, the prepared shear strength test sample is uniform in adhesive layer, free of bonding dislocation and controllable in pressurization.

The invention relates to the technical field of rock shearing, in particular to a rock shearing strength test device, test system and test method.The test device comprises a counter-force base, a horizontal loading device, a horizontal bearing plate, a vertical loading box, a vertical fixing box and a vertical loading device; the counter-force base is provided with a loading chamber, a pair of horizontal loading devices are symmetrically arranged on two opposite side walls of the loading chamber, and each horizontal loading device is connected with a horizontal bearing plate; the grooves in the vertical loading box and the vertical fixing box jointly form a space for placing a rock sample, and a pin roller is arranged on the contact surface of the vertical loading box and the vertical fixing box; and the vertical loading device applies a load to the sample through the vertical loading box. In the test process, the deformation and fracture characteristics of the rock shearing surface can be directly observed, and compared with an existing rock shearing device, the rock shearing device is more visual and closer to actual engineering, and has the characteristics of being convenient to operate and low in cost.

The invention provides a shear test device and method for simulating the seawater erosion effect on rock materials, and relates to the technical field of shear strength test devices. The device comprises a normal pressure plate, a tangential pressure plate, a bottom plate and a pressure detection side plate. The bottom plate is installed in a seawater simulation test box with an upper opening in a lifting and sliding manner, and the shear test block enters the seawater simulation test box or the shear test area through the lifting and lowering of the bottom plate. The side and bottom of the seawater simulation test box are respectively provided with a simulation pressure component and a water inlet and outlet. The invention can fully simulate the daily state of marine rocks and restore the influence of different variables in the marine environment on the shear strength of rocks to the greatest extent. The entire simulation test process is carried out in a set of devices, without the need to transfer the simulation test blocks and the simulation test control, and finally the pressure test of the test blocks is carried out autonomously, which reduces the workload of the experimenters and simplifies the structure, and is suitable for wide promotion.

The present application relates to the technical field of rock shearing, and especially relates to a rock shearing strength test device, a test system and a test method, wherein the test device comprises a counterforce base, horizontal loading devices, horizontal bearing plates, a vertical loading box, a vertical fixing box and vertical loading devices; the counterforce base has a loading chamber, a pair of horizontal loading devices are symmetrically arranged on two opposite side walls of the loading chamber, and each horizontal loading device is connected with a horizontal bearing plate; the vertical loading box and a groove on the vertical fixing box jointly form a space for placing a rock sample, and a roller is arranged on the contact surface of the vertical loading box and the vertical fixing box; the vertical loading devices apply a load to the sample through the vertical loading box. In the test process, the deformation and rupture characteristics of the rock shearing surface can be directly observed, the present application is more intuitive than the existing rock shearing device, is closer to the actual engineering, and has the characteristics of convenient operation and low cost.

The utility model relates to an asphalt test piece interlayer shear strength shearing clamp, and belongs to the field of road detection, the asphalt test piece interlayer shear strength shearing clamp comprises a clamp main body and a cutter part, the clamp main body is provided with a first side plate, a second side plate and a top plate; the first side plate and the second side plate are oppositely arranged, a cutting cavity is formed between the first side plate and the second side plate, and the top plate is connected to the top of the first side plate and the top of the second side plate. The first side plate is provided with a mounting through hole for horizontally inserting an asphalt test piece; the mounting through hole is provided with a supporting cambered surface for supporting an asphalt test piece, the top plate is provided with a cutter insertion hole for allowing the cutter piece to be vertically inserted, and the front end of the cutter piece is provided with an arc-shaped notch matched with the asphalt test piece. The device can be applied to the effect of testing the interlayer shear strength of the asphalt pavement by using the straight cutting method.

The application discloses a kind of pressure-maintaining core cross plate shear device and shear strength test method, device includes sample pressure-maintaining system, test system, control system, data acquisition system;Sample pressure-maintaining system is guaranteed by ball valve to ensure the pressure state, reach the purpose of pressure-maintaining stable before and after testing, test system carries out shear test to test sample shear strength by cross plate, control system realizes the extension and contraction of telescopic rod and the work of torque applicator, ensure that cross plate enters sample and carries out work, data acquisition system is in real time by torque sensor, HX711 module, single-chip microcomputer, RS485 communication serial port acquisition, transport and process data, and save in PC end.The application can carry out the pressure-maintaining core shear test device of testing on ship.It has strong guiding function to study submarine landslide generation mechanism, realize the safe exploitation of flammable ice and ensure the safety of submarine engineering construction.

The invention relates to the technical field of geotechnical engineering and geological disaster prevention and control, and discloses a loess slope stability calculation method considering a stress state, and the method comprises the steps: building a slope three-dimensional model according to the landform, geologic structure and rock-soil body physical and mechanical parameters of a slope; applying a load in the side slope three-dimensional model and setting boundary conditions to obtain a stressed side slope three-dimensional model; carrying out stress field solving on the three-dimensional model of the stressed side slope to obtain a global stress field of the side slope; for each collected soil sample, extracting a corresponding stress tensor from the stressed slope three-dimensional model, and determining a confining pressure condition corresponding to an indoor shear strength test; according to the confining pressure condition, an indoor shear strength test is carried out, and a soil shear strength index under the actual stress field condition is obtained; a soil sample representative horizon method is adopted, the stratigraphic position corresponding to each soil sample is analyzed, the slope stability is calculated, and the slope safety coefficient and the potential sliding surface position are obtained. Therefore, the accuracy of slope stability analysis is improved.

The application discloses an anchor bolt shearing strength test device, and relates to the field of new anchor bolt material detection. The upper end of a preset base frame is provided with a driving motor assembly, the surface of the preset base frame is provided with a hydraulic driving assembly, and the output ends of the driving motor assembly and the hydraulic driving assembly are both provided with movable nesting pieces. The anchor bolt shearing strength test device is provided with a guiding and locking mechanism. The guiding and locking mechanism keeps the eccentricity-preventing and centering positioning state of the detected workpiece. The upper and lower ends of the locking butt joint pieces work together to keep the anchor bolt centered during the locking process, ensure that the shearing force is always perpendicular to the anchor bolt axis, and make the guiding and locking mechanism and the guiding spherical wrapping piece on the end side contact each other. The guiding spherical wrapping piece provides flexible wrapping while its uniform expansion characteristic further assists the anchor bolt in keeping the centered position, effectively eliminates the additional bending moment caused by eccentric loading, makes the measured shearing strength value closer to the real strength of the material, forms multi-dimensional positioning constraints, and improves the test accuracy and repeatability.

The invention relates to a method for calculating the shear strength of a UHPC-NC bonding interface, and belongs to the field of methods for evaluating the reinforcing performance of concrete. In view of the current situation that the interface bonding strength is insufficient and characterization methods are deficient after the damaged concrete is reinforced, various factors such as different NC strengths, interface treatment modes, reinforcing thicknesses and UHPC strengths are comprehensively considered, a plurality of UHPC-NC oblique shear bonding test pieces with different influence factors are manufactured, each UHPC-NC oblique shear bonding test piece is subjected to a shear strength test, and the interface bonding strength of each UHPC-NC oblique shear bonding test piece is determined. Fitting analysis is carried out based on a test result, parameters related to the UHPC thickness are considered, and a shear strength calculation formula is constructed and used for calculating the shear strength of the test piece. The method is scientific and reasonable in calculation process and easy to operate, provides a theoretical basis for accurate calculation of the shear strength of the UHPC-NC bonding interface, and has important guiding significance for design of a UHPC reinforced concrete structure.

The invention discloses a triaxial shear strength testing method for a sewage discharge tunnel circular seam plugging ice plug body. The method comprises the following steps: S1, cutting a cylindrical sponge sample from medium-density sponge; s2, sleeving the side surface of the cylindrical sponge sample with a rubber membrane, and mounting a bottom steel support at the bottom; s3, injecting water into the cylindrical sponge sample in the rubber membrane to obtain a cylindrical sponge sample after water injection; s4, the cylindrical sponge sample after water injection is placed in a test block curing box and frozen at different set temperatures to form cylindrical sponge ice samples, and the set temperatures are the same as the average temperature of an ice plug body planned to be formed through liquid nitrogen freezing construction; s5, placing the cylindrical sponge ice sample in a triaxial testing machine, and performing a triaxial shear strength test under a set confining pressure to determine the shear strength of the cylindrical sponge ice sample under a simulated working condition; and S6, according to the test data in the S5, obtaining the triaxial shear characteristics of the cylindrical sponge ice at different set temperatures. The technical difficulty that an in-situ shear test cannot be performed on the ice plug body on site is solved.

The invention discloses a fractured rock mass high-pressure grouting sample manufacturing device and an interface shear strength testing method.The sample manufacturing device comprises a permeable stone box body, a fixed rock block and a movable rock block, and the fixed rock block is installed in one side of the permeable stone box body in a sealed mode and fixed through a rigid fixing supporting body; the movable rock block is mounted in the other side of the permeable stone box body in a sliding and sealing manner and is supported by a spring group; the interface shear strength test method comprises the following steps: mounting a test part on a sample, and mounting an adjustable cushion block for adjusting the position of the sample relative to a shear gap at the bottom of the sample so as to adjust the shear position; different shearing positions of the multiple groups of samples are tested, and data are recorded respectively. According to the manufacturing device for the fractured rock mass high-pressure grouting sample, the in-situ dehydration process of slurry in the high-pressure grouting process is simulated, the slurry stone body strength in the sample and the interface bonding strength of the slurry and rock are close to the in-situ state, and non-negligible errors caused by test conditions are greatly reduced.

A hydraulic engineering foundation detection device belongs to the technical field of foundation detection and comprises a bottom plate, a plurality of moving wheels are movably mounted on the bottom surface of the bottom plate, a vertical plate is fixedly mounted on one side of the top surface of the bottom plate, a groove is formed in the top surface of the vertical plate, a plurality of first cylinders are embedded in the groove, and an L-shaped plate is cooperatively arranged above the vertical plate. The bottom end of a vertical plate of an L-shaped plate can be inserted into the groove and fixedly connected with the top end of the moving end of the first air cylinder, a driving assembly is installed on the bottom face of a transverse plate of the L-shaped plate, and a guiding assembly is installed on the bottom face of the transverse plate of the L-shaped plate. The gravity block is in contact with the sleeve, and the weight of the gravity block applies a downward force to the sleeve, so that the sleeve and the detection assembly move downwards, and the shear strength test and the torsion peak value measurement are carried out.

The utility model discloses a tool for testing the impact shear strength of an LNG (Liquefied Natural Gas) polyurethane foam sample, which comprises a base block, a pressing block and an impact column, the base block is provided with a positioning groove matched with the pressing block, and the positioning groove and the pressing block are respectively and longitudinally provided with a first impact hole and a second impact hole which are butted and matched with each other; the first impact hole and the second impact hole are matched with an impact column, and the impact column is connected to a testing machine. According to the utility model, the punching positioning precision of the sample can be ensured, the accuracy of the impact shear strength test is ensured, the test effect is ensured, the sample cannot be damaged in the whole test process, the operation is simple and efficient, and the test efficiency is also obviously improved.

The utility model discloses a device for testing shear strength of cement stabilized soil, which belongs to the technical field of soil detection and comprises a base, a shear box is arranged on the base and comprises a lower box and an upper box, the upper box is placed at the top end of the lower box and provided with four second through holes, and the second through holes are communicated with the lower box. According to the utility model, the tops of the four positioning rods on the positioning assembly slide into the four through holes II in the upper box, so that the upper box can be conveniently positioned and fixed, the placement time of a sample is greatly shortened, and the test efficiency of the direct shear apparatus is effectively improved; the lifting scraping disc is pushed to move upwards in the lower box through the lifting cleaning assembly, so that the fractured part of the sample in the lower box can be quickly taken out, residual sample scraps on the surface of the inner wall of the lower box can be conveniently scraped and cleaned, the operation time is greatly shortened, and the cleaning efficiency of the fractured part of the sample in the lower box is effectively improved.

The invention relates to the technical field of geotechnical engineering, in particular to a discrete material pile composite foundation shear strength optimization calculation method which comprises the steps that 1, a remolded soil sample preparation device is used for remolding and preparing a matrix sample, a composite soil body is prepared according to different replacement rates, and a back pressure saturation method is adopted for saturating the sample and then conducting consolidation and drainage; 2, carrying out a shear test, and after the shear test is finished, dismounting the sample, weighing the mass and measuring the water content of a matrix; 3, drawing an effective stress path curve, calculating an effective internal friction angle and effective cohesion, and calculating shear strength test indexes of the composite soil body under different replacement rate conditions; and 4, correcting the pile body confining pressure in the composite soil body, inverting the pile-soil interaction coefficient, and calculating the cohesive force and the internal friction angle of the composite soil body based on the same matrix material and the reinforcement filler. The pile-soil interaction is exerted, the action rule of the pile-soil interaction is fully utilized, the calculation result better conforms to the action mechanism of the composite foundation, and the shear strength index value is increased from the engineering perspective.

The invention relates to the technical field of water conservancy projects, in particular to an asphalt concrete material shear strength testing device. Comprising a test box, the inner walls of the two sides of the test box are slidably connected with sliding blocks, the interiors of the sliding blocks are rotatably connected with bidirectional lead screws, one ends of the bidirectional lead screws are fixedly connected with rockers, the two sides of the bidirectional lead screws are in threaded connection with threaded blocks, the interiors of the threaded blocks are fixedly connected with connecting rods, and the outer walls of the connecting rods are rotatably connected with first rotating plates; a first rotating shaft is fixedly connected into the first rotating plate, and a pressure applying assembly is arranged on the lower surface of the supporting plate. According to the asphalt concrete material shear strength testing device provided by the invention, different extrusion heights between the pressure applying assembly and the test piece are adjusted to test the performance of the test piece under different stress conditions, and the ultimate shear force performance test of continuous extrusion until the test piece is fractured is realized; the pressure applying assembly is ensured to accurately apply different shear forces to different test pieces, test errors caused by inaccurate pressure applying positions are reduced, and the precision of test results is improved.

The invention discloses a composite board shearing strength testing system and method, the system comprises a tool and a composite board, the tool is used for limiting the composite board, the composite board comprises a sheared boss and a shearing back board, the shearing strength of the sheared boss is greater than that of the shearing back board, the shearing back board is used for receiving external force until the composite board fails, and the tool is used for limiting the composite board. A groove matched with the lug boss to be sheared is formed in the tool; the method comprises the following steps: manufacturing a sample: taking a base material layer of a composite plate as a sheared boss, and taking a composite material layer as a shearing back plate; a groove matched with the sheared boss is formed in the tool; placing the sample into the tool, placing the sheared boss in the groove, applying an external force to the shearing back plate, recording the external force of the failure of the composite plate, and calculating to obtain the shearing strength; the method can ensure that other plate layers do not fail in advance before the bonding layer fails, and ensures the accuracy of a test result.

This invention discloses a method for testing the shear strength of the frozen soil-concrete interface in underground excavation and obstacle removal operations. The steps are as follows: S1, pouring concrete test blocks of the same strength as the actual underground continuous wall under the working conditions; S2, placing the concrete test block into one end of a mold box, and filling the other end of the mold box with the same type of core soil as the core layer in the actual working conditions; S3, placing the mold box into a test block curing box, and freezing it at different set temperatures to form frozen soil-concrete samples; S4, placing the frozen soil-concrete samples into a testing machine, applying vertical pressure to the frozen soil-concrete samples, and applying dynamic load in the horizontal direction using a shear actuator; S5, obtaining the test results of the shear strength of the frozen soil-concrete interface at different temperatures, and analyzing the overall stability of the frozen soil in the core layer under dynamic load. This invention solves the technical dilemma of not being able to conduct in-situ shear strength tests on the frozen soil-concrete core layer on-site, reducing the significant risks of underground continuous wall and frozen soil core layer construction during obstacle removal.

The invention provides a solidified soil unconfined compressive strength and direct shear strength testing device and method.The device comprises a bottom plate, a lower shear box capable of horizontally moving is arranged on the upper side of the bottom plate, an upper shear box is arranged on the upper side of the lower shear box, and aligned through grooves are formed in the middle of the upper shear box and the middle of the lower shear box; a lantern ring matched with the corresponding through groove is inserted into each through groove, a transverse pressurizing plate capable of pushing the lower shear box to move horizontally is arranged on the side of the lower shear box, and a longitudinal pressurizing plate capable of moving longitudinally is arranged above the upper shear box. The device has the beneficial effects that the structures required for testing the unconfined compressive strength and the direct shear strength are integrated; the use is convenient and efficient, and the major problems that the sample specification of a traditional direct shear strength test device is fixed, and time and labor are consumed due to complex secondary processing of a solidified soil sample collected on site are solved; the device is convenient to use, and the test efficiency is greatly improved.

The invention belongs to the field of mechanical calculation simulation, and particularly relates to a method for predicting shear strength of structural surfaces with different roughness in a three-dimensional stress state. The method comprises the following steps: firstly, preparing a standard rock sample and a silicone rubber sample, splitting the standard rock sample along a splitting line to form a split rock sample with a rough surface, scanning the rough wall surface of the split rock sample, constructing a three-dimensional model, and rendering to generate a two-dimensional image; then, under the three-dimensional stress condition, a shear strength test is carried out, and the shear strength of the structural surface is measured. And finally, associating the two-dimensional image with the shear strength to construct a data set, adopting a GoogLeNet deep convolutional neural network as a reference model, performing parameter adjustment through Bayesian optimization, optimizing a training process in combination with K-fold cross validation and an early stop strategy, evaluating model performance by using a test set, and continuously iterating to improve prediction precision. According to the method, the nonlinear mapping relation between the images of the structural surfaces with different roughness and the shear strength is established, and the mechanical behaviors such as the shear strength of the structural surfaces can be predicted.