45 results about "Cyclic shear" patented technology

The utility model relates to the technical field of auxiliary material shearing, and discloses a circulating shearing device which comprises a shearing tank, a first water inlet assembly, a buffer tank and a second water inlet assembly, a first water inlet and a first feed port are formed in the top of the shearing tank, and a first discharge port is formed in the bottom; the first water inlet assembly is communicated with the first water inlet; the top of the buffer tank is provided with a second water inlet and a second feed port, and the bottom is provided with a second discharge port; the second material outlet is communicated with the first material inlet; the second feeding hole is communicated with the first discharging hole; according to the auxiliary material shearing device, on the basis that the requirement for large-batch shearing of auxiliary materials is met, the shearing time is shortened, and the shearing efficiency is improved.

The invention discloses a large-scale visualized direct shear test device and method for geosynthetics. The device comprises a main frame, an upper shear box, a lower shear box, a normal cyclic loading system, a horizontal cyclic shear loading system, a data acquisition system and a visualized monitoring system. The direct shear test device is characterized in that the direct shear test device can perform normal and horizontal cyclic loading at the same time, and normal stress with different frequencies and amplitudes can be applied according to needs to simulate a test of the characteristics of the reinforcement-soil interface under the cyclic loading effect; one side wall of the upper shear box and one side wall of the lower shear box are transparent observation windows, and a high-speed camera and a digital image analysis method are combined, so that the shear band evolution process can be visually observed and quantitatively analyzed; the shear box is large in size, and the size effect is effectively overcome. According to the invention, the interface characteristics under the cyclic load effect in the road engineering can be reflected more truly and comprehensively, the size and the function of the shear box are comprehensive, and the interface mechanical characteristics and the interaction mechanism under various working conditions can be simulated.

The embodiment of the invention provides a joint surface peak shear strength prediction method, device and equipment, a medium and a program product, and the method comprises the steps: scanning a protolith joint surface, and obtaining protolith joint point cloud data; acquiring a description function, and describing the distribution of the micro-convex bodies in the primary rock joint surface by combining the description function with the joint point cloud data; determining distribution function density and any normal stress; according to the initial peak shear and dilatancy angle in the initial state when cyclic shearing does not occur, the average value of the dip angles of the joint micro-convex bodies in actual contact is determined, and the peak shear and dilatancy angle during multiple times of cyclic shearing is determined; determining a peak shear strength prediction model of the joint surface according to the number of cyclic shear times; model calculation is simple, high-precision prediction can be achieved only through a small number of parameters, and the method is suitable for engineering application.

The invention relates to a saturated sand dynamic constitutive model construction method considering pore pressure fluctuation growth, which comprises the following steps: determining total pore water pressure including residual pore pressure component and transient pore pressure component, and constructing a normalized stress ratio skeleton curve independent of a pore pressure state; correcting the total pore water pressure to obtain corrected pore water pressure, and updating the average effective stress at the current moment by using the corrected pore water pressure; coupling the normalized stress ratio skeleton curve and the updated average effective stress to obtain a maximum shear stress value; the maximum shear stress value is used as a target state point, a dynamic virtual hysteretic curve is constructed, the stress-strain behavior of saturated sandy soil is described, accumulated damage and alternate shear shrinkage-shear expansion effects of a soil body in the cyclic loading process can be effectively considered, a pore pressure development curve and cyclic shear stress-strain response which better conform to the test rule are captured, and the test accuracy is improved. And a valuable tool is provided for evaluating the response and liquefaction strength of the saturated sand under the undrained cyclic loading condition.

The invention relates to the technical field of site saturated sandy soil liquefaction discrimination, in particular to a subway train shield tunnel underlying sandy soil layer liquefaction potential rapid assessment method based on vibration inversion, and solves the problem that the sandy soil liquefaction condition caused by subway train vibration loads cannot be assessed. The sandy soil liquefaction possibility of the target site under the action of subway train operation is rapidly and reliably evaluated, so that the requirement for early warning of liquefaction risks caused by subway vibration in the railway underpass shield tunnel engineering is met; according to the shear wave velocity Vs of the soil layer, the cycle resistance ratio CRR of the soil layer is determined; through vibration load inversion, the equivalent cyclic shear stress ratio (CSR) borne by the tunnel underlying soil layer is determined; when the equivalent cyclic shear stress ratio CSR is greater than the contrast soil layer cyclic resistance ratio CRR, the tunnel underlying layer has a liquefaction risk; otherwise, the tunnel underlying layer has no liquefaction risk.

The invention discloses a rock-fill particle cyclic shear test system and test method, and relates to the technical field of shear tests, the rock-fill particle cyclic shear test system comprises a test frame, a shear box assembly, a vertical loading device, a horizontal shear device and a data acquisition system. By adopting a rolling shaft structure, friction interference can be reduced, constant vertical stress can be accurately applied by combining the synergistic effect of a high-precision hydraulic pusher and a force transmission plate in the vertical loading device, and the horizontal shearing device can be used for shearing a workpiece through a second hydraulic pusher and a third hydraulic pusher. Dynamic simulation of a horizontal cyclic shear load under a complex stress path is realized, mechanical response of a rockfill body in an actual working condition is completely restored, a data acquisition system integrates a three-dimensional shear force sensor, a laser displacement sensor and a high-speed camera unit, a stress-displacement evolution process and particle motion mesoscopic characteristics can be synchronously captured, and the mechanical response of the rockfill body in the actual working condition is completely restored. And multi-dimensional coupling analysis can be realized in cooperation with a data processing terminal.

The utility model belongs to the technical field of hydraulic oil product performance evaluation equipment, and particularly relates to a hydraulic oil shearing stability evaluation device which comprises a hydraulic oil tank, a shearing module and a sampling module. And an oil outlet path is connected between the oil outlet end of the shearing module and the hydraulic oil tank. The testing principle of the shearing stability is that the hydraulic oil sample is circularly sheared within the testing time, and the viscosity of the hydraulic oil sample is measured after the testing time is up. According to the hydraulic oil shear stability evaluation device, the hydraulic oil tank, the oil inlet oil way, the shearing unit and the oil outlet oil way form the hydraulic oil way, in other words, the evaluation process of the shear stability is directly conducted in the hydraulic oil way, running-in of components for testing is not needed, and it can be seen that the test efficiency is greatly improved. And the test period of the shear stability is obviously shortened so as to realize rapid judgment of the shear stability.

The present invention relates to a method, device, and medium for calculating distributed pile-soil interaction damping for an offshore single pile foundation. The calculation method comprises: S1, obtaining a soil unit damping ratio-cyclic shear strain curve for a target site soil layer; S2, calculating the pile-soil interaction damping of the single pile foundation at the p-y spring level; S3, calculating the deformation of the single pile body along the depth direction under a target cyclic load amplitude; S4, obtaining the p-y spring reaction force based on the pile body displacement response and determining the corresponding damping ratio based on the horizontal displacement of each p-y spring, and calculating the secant stiffness of the corresponding p-y spring at the displacement amplitude; and S5, calculating the damping coefficient at the p-y spring level. Compared with the prior art, the present invention can take into account the actual soil layer distribution and the damping-strain characteristics of each soil layer, resulting in more accurate calculation results; the method is simple and easy to operate; and it can provide input for integrated wind turbine time-domain analysis software to explore the load-reducing effect of pile-soil interaction damping on the dynamic response of the wind turbine structure.

The application discloses a triaxial cyclic shearing seepage grouting integrated test device and method, which comprises a pressure chamber base, an integrated test mechanism, a cyclic dynamic load mechanism, a water pressure loading mechanism and a grouting mechanism, and symmetrically fixed pressure chamber support columns are arranged on the middle of the pressure chamber base, a confining pressure chamber is fixedly arranged above the pressure chamber support columns, a sample base is fixedly arranged at the middle of the bottom of the confining pressure chamber, a rubber protective sleeve is arranged on the sample base, a detachable pressure head is arranged in the upper end of the rubber protective sleeve, an axial pressure chamber is fixedly arranged above the confining pressure chamber, an axial pressure head is axially slidably arranged in the axial pressure chamber, the cyclic dynamic load mechanism is connected to one side of the axial pressure chamber, the water pressure loading mechanism is connected to one side of the confining pressure chamber, and the grouting mechanism is connected to the other side of the confining pressure chamber; the application can inject pressure-resistant oil into the axial pressure chamber and the confining pressure chamber through an oil tank, and can apply axial cyclic dynamic load and confining pressure through an axial pressure pump and a confining pressure pump, and the detachable pressure head and the sample base are both provided with water injection pipelines and grouting pipelines, so that integrated test can be realized.

The embodiment of the application provides a joint surface peak shear strength prediction method, device, equipment, medium and program product, the method comprises the following steps: scanning the original rock joint surface to obtain the original rock joint point cloud data; acquire a description function, and describe the distribution of microconvex bodies in the original rock joint surface by combining the joint point cloud data with the description function; determine the distribution function density and any normal stress; determine the average value of the actual contact joint microconvex body inclination according to the initial peak dilatancy angle of the initial state when no cyclic shear occurs, and determine the peak dilatancy angle when a plurality of cyclic shears occur; according to the number of cyclic shears, a peak shear strength prediction model of the joint surface is determined; the model is simple to calculate, can realize high-precision prediction only by a small number of parameters, and is suitable for engineering application.

The invention discloses an offshore wind power pile foundation surrounding soil damage state judgment method, which comprises the following steps: S1, carrying out a soil indoor cyclic load test to obtain a cyclic shear strain cumulative diagram; S2, obtaining complex wave force load data, and converting the data into a group of cyclic shear stress ratio data ranked from small to large; s2, finding a minimum cyclic shear stress ratio and a corresponding cyclic vibration frequency, and obtaining an equivalent cyclic vibration frequency corresponding to a next cyclic shear stress ratio based on the cyclic shear strain cumulative diagram obtained in S1; repeating the same operation until a final equivalent cycle vibration frequency corresponding to the maximum cycle shear stress ratio is obtained; s3, obtaining corresponding damage vibration times under different working conditions, and obtaining a damage vibration time contour map; s4, according to the average shear stress, finding a corresponding damage vibration frequency in the damage vibration frequency contour map obtained in S3; and comparing the final equivalent cycle vibration frequency with the damage vibration frequency, and judging whether the soil body is damaged or not. According to the method, the cost is reduced, the universality is high, and the precision can be ensured.

The invention discloses a triaxial cyclic shear seepage grouting integrated test device and method.The triaxial cyclic shear seepage grouting integrated test device comprises a pressure chamber base, an integrated test mechanism, a cyclic dynamic load mechanism, a water pressure loading mechanism and a slurry pumping and grouting mechanism, pressure chamber supporting stand columns are symmetrically and fixedly arranged in the middle of the pressure chamber base, and a confining pressure chamber is fixedly arranged above the pressure chamber supporting stand columns; a sample base is fixedly arranged in the middle of the bottom in the confining pressure chamber, a rubber protective sleeve is arranged on the sample base, a detachable pressure head is plugged into the upper end of the rubber protective sleeve, an axial pressure chamber is fixedly arranged above the confining pressure chamber, an axial pressure head is axially and slidably arranged in the axial pressure chamber, and a circulating dynamic load mechanism is connected to one side of the axial pressure chamber; one side of the confining pressure chamber is connected with a water pressure loading mechanism, and the other side of the confining pressure chamber is connected with a slurry pumping and grouting mechanism; pressure-resistant oil is injected into the axial pressure chamber and the confining pressure chamber through the oil tank, axial circulating dynamic load and confining pressure are applied through the axial pressure pump and the confining pressure pump, the detachable pressure head and the sample base are each provided with a water injection pipeline and a grouting pipeline, and an integrated test is achieved.

The invention relates to the technical field of stainless steel powder injection molding, in particular to stainless steel powder injection molding equipment and a preparation method.The stainless steel powder injection molding equipment comprises a mounting support and a filtering tank rotationally mounted on the mounting support, a guiding pipeline is fixedly mounted at the upper end of the filtering tank, and a heating connecting tank is fixedly mounted at the upper end of the guiding pipeline; a detachable upper cover is arranged at the upper end of the heating connecting tank, a discharging pipe is fixedly installed at the lower end of the filtering tank, and movable rotating columns are arranged in the filtering tank, the guiding pipeline, the heating connecting tank and the discharging pipe. Materials are turned over upwards through the inclined paddle structure to form a flow field direction opposite to that of the stirring rod, and the stirring rod and the paddle move oppositely to form a strong convection area at the junction of the heating connecting tank and the guide pipeline, so that the materials are forced to undergo multiple times of cyclic shearing and convection diffusion, and the problem of dead angles existing in traditional single stirring is solved; it is further ensured that the binder completely wraps the powder particles, and high-uniformity feeding is provided for subsequent injection molding.

The invention provides an ocean clay-geogrid interface cyclic shear stress prediction model construction method, and relates to the technical field of ocean engineering. The method comprises the following steps: preparing and assembling a marine clay-geogrid interface shear test sample; after the sample is assembled, performing a multi-working-condition interface cyclic shear test to obtain effective original test data; based on the effective original test data, constructing an interface cyclic shear test database; constructing and training a deep learning prediction model based on the interface cyclic shear test database; verifying the precision of the prediction model, screening out an optimal prediction model, and building a marine clay-geogrid interface cyclic shear stress prediction formula based on the optimal prediction model. According to the method, reliable test data under multiple working conditions are obtained, the CNN-BiLSTM model is constructed to accurately describe the shear stress evolution law, the engineering available prediction formula is established, and reliable support is provided for ocean engineering reinforced structure design and safety evaluation.

The invention discloses a dispersion method for preparing micron-sized particles, which comprises the step of using a shearing machine for dispersion, the shearing machine comprises a tank body, a tank cover, a material injection port, a material discharge port and a shearing module, and the method comprises the following steps: (1) firstly injecting a dispersion medium into the tank body of the shearing machine through the material injection port, and starting shearing; (2) injecting a dispersion phase and a dispersion medium in proportion; (3) circularly shearing the dispersed phase in a shearing machine for more than three times; and (4) discharging the small-particle-size particles or emulsion droplets from an upper material outlet under the action of fluid injection power, and sinking the large-particle-size particles or emulsion droplets to the bottom of the tank under the action of gravity to be sheared again by a shearing machine. The problems of non-uniform shearing, poor particle morphology and excessive heat production are solved, the requirement of any required scale from small-scale production to large-scale production is met, the limitation of a batch type shearing machine and a pipeline type shearing machine is solved, the amplification effect is reduced, and the research and development cost is reduced.

This utility model discloses a shearing mechanism for a vacuum mixer, comprising a mixing and shearing cylinder, a stator, and a rotor. The stator is sleeved outside the rotor and connected to the mixing and shearing cylinder via a lifting mechanism. The rotor is rotatably mounted inside the mixing and shearing cylinder and is driven by a motor that rotates it. The motor is mounted outside the mixing and shearing cylinder. A circulation line is provided at the lower end of the side wall of the mixing and shearing cylinder. The shearing mechanism for a vacuum mixer provided by this utility model utilizes a lifting mechanism to raise and lower the stator, thereby adjusting the shearing gap between the stator and rotor. This allows the device to meet the needs of different working conditions. Furthermore, the circulation line enables the device to perform cyclic shearing of materials during use, effectively improving the shearing efficiency of the device.

The application relates to a polymer reaction extrusion modification device with a circulating shearing structure. The device comprises an extruder, and the extruder comprises a barrel, characterized in that the barrel comprises a first section, a middle section and a tail section, the middle section is provided with a circulating structure; the circulating structure comprises a circulating pipeline and a driving module, the circulating pipeline is used for leading the polymer from the middle section of the barrel back to the upstream to form a circulating shearing, and the driving module is used for driving the circulating pipeline to rotate along the axis of the barrel, so that the position of a feeding port of the circulating pipeline relative to the barrel changes; according to the application, the circulating pipeline is arranged independently of the barrel of the extruder, controllable physical shearing can be applied to the product after the grafting reaction is completed, and the problem that the reaction and the shearing interfere with each other in the traditional device is avoided.

The application provides a marine clay-geogrid interface cyclic shear stress prediction model construction method, and relates to the technical field of marine engineering. The method comprises the following steps: preparing and assembling a marine clay-geogrid interface shear test sample; after the sample is assembled, a multi-working-condition interface cyclic shear test is carried out to obtain effective original test data; based on the effective original test data, an interface cyclic shear test database is constructed; based on the interface cyclic shear test database, a deep learning prediction model is constructed and trained; the accuracy of the prediction model is verified, the optimal prediction model is screened out, and a marine clay-geogrid interface cyclic shear stress prediction formula is built based on the optimal prediction model. The application can obtain reliable test data under multiple working conditions, accurately depict the shear stress evolution law by constructing a CNN-BiLSTM model, build an engineering usable prediction formula, and provide reliable support for the design and safety evaluation of marine engineering reinforced structures.

This invention provides a method for correcting the vertical bearing capacity of pile foundations in liquefiable silty soil considering the vibration time effect, relating to the field of geotechnical engineering. This method includes S1: based on vibration time history data from the engineering site, baseline correction, bandpass filtering, and normalization are performed on the original vibration acceleration time history to obtain a standardized vibration acceleration time sequence; S2: based on the standardized vibration acceleration time sequence, a one-dimensional equivalent shear beam model is used for seismic response analysis to calculate the cyclic shear stress time history distribution of soil layers at different depths, obtaining the cyclic shear stress time history distribution field of the soil layers. By performing baseline correction, frequency band filtering, and amplitude unification processing on the vibration acceleration time history, the input data possesses stable spectral characteristics and a consistent scale foundation, and combined with a shear propagation model, a continuous distribution of stress response at different depths over time is obtained.

The invention discloses a multi-field coupling control unsaturated soil direct shear test system and method, and belongs to the technical field of geotechnical engineering. The system comprises a high-pressure sealing pressure-bearing loading host, a shear box assembly integrating a pottery clay plate and a temperature control flow channel, a dual-channel environment control system and a servo loading and acquisition control system. Accurate control of matrix suction is realized by combining a high-pressure closed cavity with an axial translation technology, wide-temperature-range wrapped temperature control is realized through a shear box side wall integrated flow channel, active control of three complex normal boundary conditions of constant load, constant rigidity and constant volume is realized by adopting a normal servo driving module with a built-in sensor, and meanwhile, the normal servo driving module is used for driving the shear box side wall integrated flow channel to control the temperature of the shear box side wall integrated flow channel. Monotonic shearing and cyclic shearing of unsaturated soil are achieved through the horizontal shearing servo driving module. The problem that traditional equipment cannot accurately test static and dynamic characteristics of unsaturated soil in a multi-field coupling environment is solved, and a high-simulation test platform is provided for soil behavior research under complex working conditions.

The application discloses a dispersion method for preparing micron-sized particles, which comprises the step of dispersing by using a shearing machine, wherein the shearing machine comprises a tank body, a tank cover, a material injection port, a material discharge port and a shearing module, and the method comprises the following steps: (1) injecting a dispersion medium into the shearing machine tank body through the material injection port firstly, and starting shearing; (2) injecting a dispersed phase and the dispersion medium in proportion; (3) making the dispersed phase circulate and shear in the shearing machine for more than three times; and (4) discharging small-particle-size particles or emulsion drops from the upper material discharge port under the action of fluid injection power, and sinking large-particle-size particles or emulsion drops back to the tank bottom under the action of gravity to be sheared by the shearing machine again. The application solves the problems of uneven shearing, poor particle morphology and excessive heat generation, meets the demand of any required scale from small test to scale-up production, solves the limitations of batch-type shearing machines and pipeline-type shearing machines, reduces scale-up effect and reduces research and development cost.

The invention relates to the field of anchor cable performance testing, in particular to an NPR anchor cable dynamic cyclic shear failure simulation experiment device, and provides the following scheme aiming at the problems that a simulation experiment device in the prior art is inconvenient in force application direction change and inconvenient in test piece separation and closure: the simulation experiment device comprises a test board and a force application mechanism, the test board comprises a base, a mounting plate fixed on the top surface of the base, two material fixing mechanisms mounted on the top surface of the mounting plate and a test piece fixing mechanism, the two fixing mechanisms are respectively positioned on two sides of the test piece fixing mechanism, and one of the material fixing mechanisms is fixed on the top surface of the mounting plate; and the other material fixing mechanism is movably mounted on the top surface of the mounting plate through a sliding connection piece, and a first telescopic piece used for driving the material fixing mechanism to move is mounted on the top surface of the mounting plate. The force application direction can be conveniently adjusted, the two second test pieces and the first test piece can be conveniently folded or separated before testing, and operation of testers is facilitated.

This invention relates to a method and storage medium for calculating the centralized pile-soil interaction damping of a marine monopile foundation. The calculation method includes: S1, obtaining the soil element damping ratio-cyclic shear strain curve of the target site soil layer; S2, calculating the pile-soil interaction damping of the monopile foundation at the p-y spring level; S3, calculating the pile deformation along the depth direction of the monopile under the target cyclic load amplitude; S4, based on the pile displacement response in S3, calculating the maximum elastic potential energy stored in the soil spring and the dissipated energy at each p-y spring; S5, calculating the strain energy stored in the bending deformation of the pile; S6, integrating along the pile length direction to calculate the energy dissipated W by all p-y springs. D and all elastic properties W S S7. Calculate the global damping ratio of the pile-soil interaction in a single pile foundation. Compared with existing technologies, this invention can consider the actual soil layer distribution and the damping-strain characteristics of each soil layer, resulting in more accurate calculation results; the method is simple, easy to operate, and has high application value.

The utility model discloses a material screening mechanism for nano tungstic acid vibration rubbing and screening equipment, which comprises a rack, a blanking hopper, a vibration motor, a screen, a rubbing and screening structure and a circulating shearing structure, the rubbing and screening structure comprises a rotating motor, a rotating shaft and a rubbing and screening plate, and the circulating shearing structure comprises a shearing part and a matching seat. The shearing piece is located at the center line position of the shearing area in the initial state, the radian of the shearing piece is increased along with the increase of the rotating speed of the rotating shaft till the shearing piece is clamped in the matching base, the radian of the shearing piece is shortened along with the reduction of the rotating speed of the rotating shaft, and agglomerated materials falling at the upper end of the shearing piece are sheared and then rubbed by the rubbing sieve plate. According to the utility model, powder can be uniformly wiped and sieved, and the utilization rate of tungstic acid raw materials is higher.

The present invention discloses a test method for the monotonic and cyclic shear interface friction characteristics of state-related sand-structure, including: obtaining a state-related sand-structure contact body specimen, pre-applying confining pressure to the state-related sand-structure contact body specimen, and using a sensor to obtain the monitoring results of the pre-applied confining pressure; based on the monitoring results, obtaining the corrected relative density of sand; conducting a first displacement monotonic shear test to obtain a first variation law; conducting a second displacement cyclic shear test to obtain a second variation law; based on the first variation law and the second variation law, respectively establishing a state-related initial shear modulus prediction model, a state-related friction coefficient prediction model for monotonic shear test, and a state-related friction coefficient evolution model for cyclic shear, and obtaining the friction coefficient and initial shear modulus for monotonic and cyclic shear. The present invention can ensure the construction and operation safety of the project.

This invention discloses a wet-dry cycle-shear coupled secondary sample preparation device and testing method. The device includes a shear system, a wet-dry cycle system, and a support structure. The shear system is used to apply horizontal shear loads and normal loads, the wet-dry cycle system is used to synchronously control the wetting and drying process of the original ring sample, and the support structure is used to fix the overall device. The testing method includes secondary coupled sample preparation and direct shear test. The secondary coupled sample preparation forms a preset shear surface through the coupling effect of wet-dry cycle and shear stress. The direct shear test measures soil strength parameters under multiple working conditions and analyzes the strength evolution law. This invention solves the problem that existing technologies cannot synchronously control the wet and dry state of secondary processed samples during shearing, realizes real-time coupling of wet-dry cycle and shear load, realistically simulates the actual stress state of expansive soil slopes, overcomes the limitations of in-situ sampling and single wet-dry cycle test, and provides a reliable test platform for long-term stability evaluation of expansive soil slopes.

The invention relates to a testing device for cyclic shear characteristics of a geotechnical material structure interface. The testing device comprises a shear box system, a vertical loading mechanism, a horizontal loading mechanism and a horizontal supporting mechanism. And the shear box system comprises a shear box main body and a soil body chamber in the shear box main body. The horizontal loading mechanism drives the shear box body to move horizontally, the horizontal supporting mechanism penetrates through the side wall of the shear box body and supports the soil body chamber to limit horizontal movement of the soil body chamber, and the stress action lines of the horizontal supporting mechanism and the soil body chamber are collinear. The shear box body is flush with the top of the soil body chamber, and the bottom is filled with a structural plane material sample and injected with liquid. The soil body chamber is filled with a rock-soil sample, the bottom surface of the rock-soil sample is in contact with the top surface of the structural surface sample, and the top surface is lower than the liquid level. The vertical loading mechanism is used for applying a load to the rock-soil sample. Compared with the prior art, the problem that the test accuracy is reduced due to the fact that the contact surfaces of the two samples incline is effectively solved.

The invention discloses a device and a method for simulating pile-soil interface cyclic shear characteristics in a hydrate replacement exploitation process, and particularly relates to the field of natural gas hydrate exploitation, the device comprises a supporting structure, a power mechanism, a high-pressure reaction kettle system, a control system, a data acquisition system and a data storage system, the high-pressure reaction kettle system comprises a high-pressure reaction kettle, an upper end cover is arranged at the top of the high-pressure reaction kettle, a lower end cover is arranged at the bottom of the high-pressure reaction kettle, high-strength screws are arranged in the upper end cover and the lower end cover, the high-strength screws are in threaded connection with the supporting structure, and sealing rings are connected to the outer sides of the bottoms of the upper end cover and the lower end cover in a sleeving manner. The device can accurately simulate a deep sea high-pressure environment, realizes a CO2 generation and replacement process of methane hydrate, can perform high-precision monotonous or cyclic shear test on a pile-soil interface in and after the process, effectively eliminates a rigid boundary effect, and obtains real and reliable interface mechanical parameters.

The present invention discloses a low-temperature rock mass variable-frequency variable-amplitude dynamic shear acoustic physics test system and a test method. The test system includes a low-temperature control subsystem, a dynamic shear subsystem, an acoustic physics test subsystem, and a measurement and control subsystem. This testing machine realizes fatigue cyclic shear tests with variable frequencies and variable amplitudes through a frame system and an environmental chamber, and simultaneously conducts acoustic emission and ultrasonic tests. It can invert the source mechanism during the shear fracture process of the rock mass, and can also perform acoustic wave imaging on the degradation of the mesoscopic structure during the deformation and fracture process of the rock mass. It has the characteristics of adjustable frequency and amplitude, can simultaneously conduct acoustic emission and ultrasonic tests, invert the source mechanism during the shear fracture process of the rock mass, and perform acoustic wave imaging on the degradation of the mesoscopic structure during the deformation and fracture process of the rock mass.

Disclosed are an underground engineering rock mass shear simulation test device, a test method and a test machine. The test method includes: setting different test conditions by a controller to perform cyclic shear test at high temperature, fracture shear seepage test, granite uniaxial compression test at high temperature and granite fracture shear test under constant normal stiffness boundary conditions at room temperature. The electric heating wire assembly, the fan assembly and the environmental box are combined to flexibly and uniformly heat the samples placed in the upper shear box and the lower shear box. In terms of shear-seepage test, this scheme proposes a second sample placing mechanism that realizes sealing through sealing capsule and sealing capsule pressing plate. It realizes stable sealing and facilitates monitoring and debugging of seepage parameters.