35 results about "Triaxial compression" patented technology

The invention relates to the technical field of oil and gas well wall stability and fracturing yield increase development, in particular to a deep high-temperature rock statistical damage constitutive model construction method which comprises the following steps: performing mineral component and microstructure analysis on a deep rock core by adopting XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscope) technologies, and performing quantitative statistics on mineral content to obtain a deep high-temperature rock statistical damage constitutive model. The method comprises the following steps: acquiring rock brittleness and plasticity characteristic basic data, performing a triaxial compression test by adopting a high-temperature triaxial compressor, and establishing a constitutive model capable of reflecting deep high-temperature rock damage; according to the mechanical characteristics of the deteriorated rock due to temperature rise, the provided model is verified to accurately simulate stress-strain curves of a sample in each stage of a single axis and a conventional three axis under different temperatures and confining pressures, the rationality of indexes is verified, and the deep high-temperature rock statistical damage constitutive model is obtained. The method solves the problem that in the prior art, a statistical damage constitutive model capable of accurately reflecting stress-strain characteristics of the deep high-temperature rock at each stage of a single axis and a conventional three axis under different temperatures and confining pressures is lacked.

An infrared and acoustic emission monitoring rock true triaxial rapid unloading confining pressure test system and method. Mainly include: rigid pressure loading system, air pressure control system, gas confining pressure chamber, infrared observation system. The vertical loading system provides Z direction load; the lateral loading system provides Y direction load; the external gas source provides gas pressure, enters the gas pressure chamber through the floor gas pipeline, provides X direction load; the gas pressure chamber X direction is provided with front and rear infrared observation windows, both are CaF2 glass materials, can erect infrared thermal imager to realize infrared observation; the loading plate can be built-in acoustic emission probe through the detachable structure. The present application uses the pressure head and the pressure plate to provide the pressure in Y direction and Z direction through special design, uses the gas to supply the pressure in X direction, can realize the X direction rapid unloading, and solves the problem that the infrared visualization is difficult to realize in the true triaxial compression test process. Through the detachable design of the loading plate, the acoustic emission probe can be built-in.

This invention discloses a surrounding rock seepage experimental device and its detection method based on triaxial compression, comprising: a base, an arched frame fixed on the base, and a triaxial pressure component, an axial loading component, a seepage component, and a data acquisition component mounted on the base; the triaxial pressure component includes a confining pressure adaptive homogenization device. This invention utilizes a lifting drive component to adjust the position of the outer cylinder in real time through the confining pressure adaptive homogenization device, automatically compensating for the pressure gradient on the rock sample surface, ensuring uniform transmission of confining pressure, and fundamentally suppressing localized deformation causes; addressing the disconnect in dynamic deformation location data caused by insufficient monitoring capabilities, the multidimensional permeability monitoring and acquisition component moves around the rock sample under the drive of the drive component, locking the localized deformation area in real time, and simultaneously capturing the seepage state parameters (such as permeability and flow velocity) at that location, ensuring strict correspondence between the data and the deformation process.

The invention discloses a method for constructing a biaxial compression strength prediction model of a double-hole model sample, which comprises the following steps of: correcting a Mohr-Coulomb strength criterion by combining intermediate principal stress to obtain a Mohr-Coulomb strength formula corresponding to the triaxial compression strength of a complete rock; introducing a hole reduction coefficient, and obtaining a reduction model corresponding to the hole influence; a Mohr-Coulomb strength formula corresponding to the triaxial compression strength of the complete rock is reduced, and a triaxial compression strength prediction model of the double-hole model sample is obtained; and obtaining a biaxial compression strength prediction model of the double-hole model sample. By introducing the hole reduction coefficient, the coupling influence of coexistence of the two holes and geometric configuration of the two holes on the macroscopic strength of the rock mass is clearly quantified, the technical defect that an existing rock mass strength prediction model cannot accurately reflect the strength weakening effect caused by interaction of the two holes is overcome, and compared with a complex full-three-dimensional numerical simulation method, the method has the advantages that the method is easy to implement. The model calculation process is simpler, more convenient and more efficient.

The invention relates to a triaxial rock brittleness evaluation method based on a cohesive polymerization degradation-friction strengthening model. The triaxial rock brittleness evaluation method comprises the following steps: obtaining a load-time curve and a uniaxial stress-strain curve of a Brazilian splitting experiment and a stress-strain curve of a triaxial compression experiment; determining a uniaxial brittleness index based on a Mohr-Coulomb shear strength curve and a CWFS model according to a load-time curve and a uniaxial stress-strain curve; determining a confining pressure influence brittleness coefficient according to a triaxial stress-strain curve under different confining pressures based on the Moire circle, the cohesive force and the friction angle change trend under the triaxial stress state; and determining a triaxial brittleness index Btri by using the uniaxial brittleness index Bu and the confining pressure influence brittleness coefficient Bp. The core parameters adopted by the brittleness index are cohesive force and internal friction angle and can be directly obtained through petroleum engineering conventional logging data inversion, the field application threshold is remarkably reduced, and the limitation that the traditional brittleness index depends on special experimental data is broken through.

The invention discloses a rock dynamic and static tension and compression multi-field coupling test method, and relates to the technical field of rock dynamic load, static load, tension and compression, shearing, rheology, temperature, seepage, chemistry, ultrasonic wave, acoustic emission, resistivity and other multi-field coupling tests. The sample is of a dumbbell-shaped structure with upper and lower end diameters larger than the middle diameter; the method comprises a triaxial axial tensile test, a triaxial compression test, a triaxial dynamic impact test, a dynamic and static triaxial multi-field coupling test at different temperatures and a true triaxial shear seepage coupling test. In the triaxial tensile test process, the end part of the test sample does not need to be glued, the test sample adopts a dumbbell-shaped test sample shape design, the axial tensile force is provided by using a confining pressure loading system and adopting confining pressure, and the axial tensile test of the rock under different confining pressure conditions can be realized.

This application discloses a rapid method for determining the macroscopic strength parameters of layered rock masses. For layered rock masses without discontinuous joints or fractures, the method includes the following steps: S1. Conducting conventional uniaxial triaxial compression tests on matrix rock blocks to obtain the stress-strain curves of the matrix rock blocks, and fitting the peak strength and residual strength of the matrix rock blocks under different confining pressures to obtain the strength parameters of the matrix rock blocks; S2. Conducting shear tests on bedding samples to obtain the stress-strain curves of the bedding surfaces, and fitting the peak strength and residual strength of the bedding surfaces under different normal stresses to obtain the strength parameters of the bedding surfaces; S3. Taking the average of the peak strength of the matrix rock blocks and the peak strength of the bedding surfaces, as well as the average of the residual strength of the matrix rock blocks and the residual strength of the bedding surfaces, to obtain the macroscopic equivalent strength parameters of the layered rock mass without discontinuous joints or fractures.

The invention discloses a gas-solid coupling creep disturbance effect test device, and belongs to the technical field of rock rheological disturbance tests. Comprising an axial pressurization device, a disturbance impact device, a three-axle box, an axial pressure transmission column, a limiting device, a confining pressure control device and a gas seepage device. The device is high in overall stability and air tightness, can be used for conventional rock uniaxial and triaxial compression creep disturbance tests, and can also be used for gas-solid coupling creep disturbance tests for gas-containing coal rocks. The device meets the requirements of a rock rheological disturbance effect test, and provides an important experimental basis for researching rock mass fracture and damage evolution characteristics under the rheological disturbance condition. According to the pneumatic impact device, the impact weight does not need to be manually lifted to apply impact, and is changed into pneumatic impact, so that the safety and the convenience are remarkably improved. The pneumatic impact load flexibility and controllability are higher, so that researchers can design various different experiment schemes including disturbance of frequency conversion, impact amplitude and duration.

The invention discloses a multifunctional pressure chamber and a test method, and relates to the field of geotechnical engineering test equipment.The multifunctional pressure chamber comprises a pressure chamber shell, a closed cavity used for containing a sample is formed in the pressure chamber shell, and an axial loading piston penetrates through the center of the top of the pressure chamber shell and is used for applying axial stress to the sample; a confining pressure liquid inlet and outlet is formed in the lower part of the pressure chamber shell, hydraulic oil is injected into the closed chamber through the confining pressure liquid inlet and outlet, and uniform radial confining pressure is applied to the sample; a flexible capsule is embedded in the sample clamping frame, the flexible capsule is attached to the sample through an end sliding block, a flexible capsule hydraulic medium inlet and outlet connected with the flexible capsule is further formed in the pressure chamber shell, a pressure medium is injected into the flexible capsule through the flexible capsule hydraulic medium inlet and outlet, and therefore stress is independently applied to the sample in the second direction. The three test functions of uniaxial compression, conventional triaxial compression and true triaxial compression can be realized on the same device, the integration level is high, the conversion is convenient and fast, and the cost is low.

The invention discloses a core concrete triaxial compressive stress detection device and detection method, and the key point of the technical scheme is that the core concrete triaxial compressive stress detection device comprises a triaxial compressive stress detection table; a steel tube concrete placing table is formed on the triaxial compressive stress detection table; a triaxial compressive stress detection mechanism is assembled on the concrete filled steel tube placement table and comprises a base table arranged on a triaxial compressive stress detection table. Through reasonable arrangement of the triaxial compressive stress detection table, the concrete filled steel tube placement table and the triaxial compressive stress detection mechanism on the concrete filled steel tube placement table, stable placement of a test piece and close fit of the detection mechanism are realized, and the accuracy and reliability of the whole detection process are ensured; a layered supporting structure of the base table, the supporting frame and the bearing beam is combined with the two linear guide rails arranged in parallel in the transverse direction of the bearing beam and the guide rail platform sliding on the side faces of the linear guide rails, so that the detection device has good transverse moving and positioning capacity, the detection position can be conveniently and accurately adjusted, and the flexibility and the detection efficiency of the device are improved.

A method for judging the activation tendency of hydraulic fracturing induced fault considering rock damage: 1) basic parameters adopt triaxial compression experiment, respectively determine the cohesion c, internal friction angle phi of hydraulic fracturing formation, pore water pressure p0, logging and seismic inversion data determine the first, second and third principal stress of fault sigma1, sigma2, sigma3, the length L of the hydraulic fracture closest to the fault and the fault dip angle beta and strike; 2) based on the Mohr-Coulomb law, the state function M(D) of the activation tendency of the fault is established by the damage variable D; 3) the discrimination criterion of the activation tendency of the fault is established, and the tendency and risk of the activation of the fault are evaluated according to the discriminant formula. Through the above method, the activation of the fault can be more accurately predicted, the safety of hydraulic fracturing operation is effectively improved, and the possible earthquake accident can be avoided.

The invention relates to a brittleness index evaluation method and system for a high-temperature and high-confining-pressure fractured rock mass, and belongs to the field of rock mass mechanics, and the method comprises the following steps: step 1, obtaining a stress-strain relational graph of the fractured rock mass under different high-temperature and high-confining-pressure conditions through a triaxial compression experiment; 2, mechanical parameters of the fractured rock mass under different conditions are extracted based on the stress-strain curve, and energy distribution of all stages is calculated; 3, establishing an initial brittleness evaluation index; and 4, establishing a correction factor by adopting an entropy weight method, and correcting the initial brittleness evaluation index to obtain a final brittleness evaluation index. The method can quantitatively evaluate the brittleness index of the fractured rock mass under the conditions of high temperature and high confining pressure, and provides a new method for evaluating the brittleness of the high-temperature and high-pressure rock.

The application provides a fissure rock mass natural stress and water flow environment indoor simulation device, and relates to the technical field of fluid-structure coupling test.The simulation device uses the fissure rock mass sample to be placed in a stress and water flow environment simulation tank, injects hydraulic oil into the test cabin, transmits the hydraulic oil through the flexible shell and the confining pressure head, applies the specified confining pressure to the fissure rock mass sample, drives the shaft pressure rod to apply the specified axial pressure to the fissure rock mass sample through the shaft pressure head, simulates the specified water flow environment to the fissure rock mass sample through the water inlet and the water outlet, and makes the simulation device apply the three-dimensional natural stress to the fissure rock mass sample and apply the water flow environment to the lateral side of the sample, so that the water can flow into the fissure rock mass sample and flow out of the sample.Based on the simulation device, the important tests such as the triaxial compression test and the borehole water pressure test under the coupling condition of the fissure rock mass stress and the water flow can be carried out, and the simulation device has the characteristics of simple operation, various functions and wide application range.

The present application relates to a kind of rock triaxial mechanical parameter testing device and method under the contact of carbon dioxide, including rock and carbon dioxide contact and triaxial compression test system and with rock and carbon dioxide contact and triaxial compression test system respectively connected axial pressure control system, confining pressure control system, temperature control system and carbon dioxide pressure control system, still include computer data record and control system;The axial pressure control system, confining pressure control system, temperature control system and carbon dioxide pressure control system are connected with computer data record and control system;The present application simulates triaxial rock mechanics parameter test in the direct contact process of underground reservoir rock and carbon dioxide in the process of carbon dioxide drilling, fracturing, displacement, burying etc., can obtain the rock mechanics parameter in the direct contact process of carbon dioxide and rock under the most close real reservoir environment and engineering condition.

A brittle evaluation method of weathered granite under different confining pressures, comprising: drilling fresh granite rock samples from underground mine, and making standard test pieces under natural environment for 7 years of weathering; respectively performing triaxial compression synchronous acoustic emission test of the standard test pieces under different confining pressures, obtaining stress-strain relationship diagram, acoustic emission energy-cumulative energy-stress-time relationship diagram of each standard test piece; defining brittle index of weathered granite by acoustic emission cumulative energy B 3. Quantitative evaluation of the brittleness of weathered granite under different confining pressures. The present application does not completely depend on the change of stress-strain behavior, directly obtains from the acoustic emission signal parameters, is convenient and fast, has simple calculation process, improves the certainty of the brittle evaluation result, and has good application prospect for studying the deformation and failure of such mine surrounding rock and stable support in mine operation.

The invention provides a physical model evaluation method for improving a large principal stress difference vertical well fracturing crack bandwidth. The physical model evaluation method comprises the following steps: step 1, measuring an in-situ triaxial stress difference; 2, pouring an artificial rock sample, wherein the triaxial compression strength is consistent with that under the condition of large principal stress difference on site; 3, carrying out a fracturing physical model experiment under the condition of conventional large principal stress difference; 4, carrying out a large principal stress difference fracturing physical model experiment under the condition of pre-injection of low mucus; step 5, comparing the number of acoustic emission AE events monitored by the verification physical model; 6, fracturing physical model experiments of different pre-injection liquid quantities are carried out; and step 7, forming evaluation of the transformation effect of the pre-injected low mucus on the fracturing fracture bandwidth under the large principal stress difference condition. According to the physical model evaluation method for improving the large principal stress difference vertical well fracturing fracture bandwidth, the possibility of fracture wave and bandwidth and fracturing fracture complexity under the large principal stress difference condition is accurately evaluated, the transformation size and the single well productivity are increased, and ultra-deep compact reserve upgrading and effective regional utilization are achieved.

The present invention relates to the cross - technical field of tunnel engineering and geotechnical mechanics testing, and discloses a triaxial compression grouting test device and method with a variable bearing contact area, which includes a cube - shaped specimen; the loading system includes a reaction frame and a plurality of hydraulic rods rotatably connected to the reaction frame through driving members. The output ends of the hydraulic rods are circumferentially connected with a plurality of pressurizing mechanisms, and the output ends of the hydraulic rods are also detachably connected with a plurality of groups of bearing blocks arranged circumferentially. The front surfaces of the plurality of bearing blocks in each group are arranged in an inclined plane in the counter - clockwise direction, and the outer edges of the plurality of bearing blocks in each group gradually shrink in an arc shape. The plurality of pressurizing mechanisms are respectively used to abut against the front surfaces of the plurality of groups of bearing blocks, and the back surfaces of the plurality of bearing blocks are fitted with corresponding multi - layer nested bearing plates, and the bearing plates are used to abut against the end faces of the specimen. The present invention can more realistically restore the stress state of tunnel surrounding rocks, can make the bearing area adaptively adjust as the volume of the specimen decreases, and avoid stress concentration.

The application discloses a kind of high-temperature heated compression brittle solid material life evaluation method, for high-temperature heated compression brittle solid material, first process four categories specific size samples, by triaxial compression, compression rheology, CT scanning and other kinds of tests, measure compressive strength, strain-time curve and initial damage key parameters, based on fracture damage mechanics, the deformation time evolution equation containing temperature, stress and other parameters is used for life evaluation, the application is based on fracture mechanics theory, verify that the trend of theoretical curve and test curve is similar and numerical comparable, ensure that life evaluation result is reliable.

The application provides a rock sample disturbance characteristic test method for controlling the degree of rupture, comprising the following steps: S1: sample preparation; S2: true triaxial compression test loading; S3: disturbance test; S4: lower test; S5: data analysis and result analysis. The application realizes accurate simulation and test of the disturbance characteristics of the rock under different degrees of rupture by calculating the rock rupture degree index (RFD) in real time during the true triaxial compression test and accurately controlling the rupture degree of the research object. The application can complete the disturbance test of samples with different degrees of rupture on one sample, can save the cost and time of indoor test, and can reduce the influence of sample discreteness. The method can more accurately study the mechanical behavior and failure mode of the rock under different degrees of rupture, and can provide theoretical guidance for engineering practice.

A triaxial test device for deep-sea coring retaining in-situ condition suitable for a shipborne laboratory, includes a sample transfer system and a triaxial machine system. The sample transfer system includes a sample cylinder, a tube-removing piston, a ball valve, and a connector, the sample cylinder is connected to the ball valve through bolts, the sample is placed in the sample cylinder, and the tube-removing piston arranged in the sample cylinder is configured to push the sample to enter the triaxial machine system. The triaxial machine system includes a bottom interface, a rubber cylinder, a triaxial inner wall, a triaxial outer wall, and a top interface; the bottom interface is hermetically connected to the sample cylinder through the connector, the bottom interface communicates with the rubber cylinder arranged in an inner cavity of the triaxial inner wall, the sample is sent into the rubber cylinder for a triaxial compression test.

The invention provides a nitrogen proportion determination method in high-temperature nitrogen liquid carbon dioxide coal seam anti-reflection, which comprises the following steps: performing a triaxial compression test on a coal sample collected in a target coal seam, measuring compressive strength values under different confining pressures, and determining an injection pressure threshold value of liquid carbon dioxide injected into the target coal seam; determining the permeation change rates of the coal sample at different temperatures and the adsorption space variation of the coal sample to carbon dioxide / methane at the same temperature; determining an injection proportion optimization model based on the permeation change rate and the adsorption space variation; according to the initial temperature of the target coal seam and the temperature of the high-temperature nitrogen, the injection proportion of the high-temperature nitrogen is determined through the injection proportion optimization model; by means of the technical scheme, the injection proportion of the high-temperature nitrogen can be determined, and accurate control over the injection proportion of the high-temperature nitrogen is achieved.

The invention discloses a karst area extrusion and expansion branch pile settlement calculation method considering the extrusion and expansion compaction effect, and the method comprises the steps: calculating the self-weight stress, confining pressure and partial principal stress of a soil layer through on-site drilling coring, indoor soil test, triaxial compression test and single pile test, and obtaining a relation curve of the partial principal stress and axial strain; the method comprises the following steps: establishing a pile-soil three-dimensional model based on finite element software, respectively arranging extrusion and diffusion hard areas on the lower part and the periphery of a supporting disc, establishing analysis steps by combining a graded load sequence, calculating a soil body secant modulus between adjacent loads, endowing differentiated elastic modulus, and completing corresponding elastic modulus assignment and finite element calculation under each analysis step, extracting a pile top settlement value, comparing the pile top settlement value with a field test pile load-displacement curve, and substituting the pile top settlement value into engineering pile design parameters to estimate instantaneous and long-term settlement; the method can accurately quantify the squeezing and diffusion compaction effect, is adaptive to the complex stratum of the karst area, and has important guiding significance for further estimating the settlement of the engineering pile applied on a large scale subsequently.

The application discloses a kind of simulation methods of carbonate rock pore retention mechanism under super deep thermal fluid-solid coupling, it is related to rock physics technical field.The application is prepared by preparing carbonate rock sample, obtains its CT scanning slice image extraction three-dimensional pore information, after laboratory preparation plunger sample is carried out pseudo triaxial experiment, laboratory test result is used to calibrate micro parameter after construction carbonate rock model, cooperate in carbonate rock model and layout measuring ball, dynamically monitor porosity and pore pressure variation, by laboratory experiment, determine the strength reduction function of carbonate rock after, carbonate rock model is applied temperature field and stress field collaborative change true triaxial compression servo environment, using carbonate rock model carries out true triaxial experiment numerical simulation, obtains the pore condition inside carbonate rock of each stage evolution, determines the pore retention mechanism of carbonate rock under super deep thermal fluid-solid coupling, provides technical support for carbonate rock reservoir research.

The present application relates to the field of well logging evaluation technology of oil and gas exploration and development, and particularly relates to a method for evaluating shale fracturing property based on rock physical experiment, comprising the following steps: S1, obtaining rock fracturing property experimental parameters by using laboratory core fracturing triaxial experiment; S2, analyzing the obtained experimental parameters to obtain analysis results; S3, combining the analysis results with logging parameters to establish a fracturing strength model, a fracture complexity model and a fracture extension model; and S4, using the analysis results as a standard scale to establish a fracturing property index model based on rock physical experiment by using the related models. The present application is based on triaxial compression rock physical experiment, and by analyzing three processes of applying pressure, fracture opening and fracture extension in fracturing, the correlation between each process and logging parameters is established, and finally a fracturing property index is formed to evaluate the shale fracturing property.

This invention discloses a triaxial testing method for soft soil, comprising the following steps: S1, modifying the triaxial apparatus by fixing a socket to the base of the triaxial apparatus; S2, preparing the specimen outside the triaxial apparatus; S3, using a clamp to transfer the prepared specimen and its mold assembly as a whole into the triaxial apparatus; S4, fixing the specimen and its mold assembly; S5, injecting water into the pressure chamber of the triaxial apparatus to apply confining pressure, while simultaneously injecting water into the cylindrical mold through the water supply and drainage pipes to maintain the force balance inside and outside the cylindrical mold. The water-responsive mold dissolves upon contact with water, and the specimen remains upright under the confining pressure; S6, conducting the test; S7, after the test is completed, placing a new specimen and repeating steps S3-6 until all specimens have undergone triaxial testing. This invention does not disturb the specimen, ensures the stability of the specimen's mechanical properties, improves the accuracy of the triaxial compression test, and shortens the time required to use the triaxial apparatus.

The invention discloses a strength prediction method and a preparation method of randomly distributed fracture rock, which comprises the following steps: carrying out conventional uniaxial and triaxial compression tests on a randomly distributed fracture rock sample, and collecting strength data and stress-strain data of the sample in the test process; establishing and verifying a strength model; the water-soluble characteristic of the material avoids the operation of extra pulling out when the material is used for manufacturing cracks, so that the limitation of the prefabricated number, form, position range and distribution form of the cracks can be eliminated. The analysis of the fracture form is not only limited to a two-dimensional angle, but extends to a complex and more real three-dimensional space, so that the distribution information of the fracture is brought into the research category. Different types of randomly distributed fractured rock masses can be researched by matching different similar materials. The established strength prediction model of the randomly distributed fractured rock mass can reflect the influence of the three-dimensional fracture distribution information on the rock mass strength. The randomly distributed fracture rock strength predictor is simple and convenient to operate and high in prediction precision.

The specification provides a continuous mud logging method and device. The method comprises: obtaining a while-drilling rock sample and a full-diameter core sample, and screening a target rock sample from the while-drilling rock sample; performing a micro-indentation experiment on the target rock sample to obtain static parameters of the target rock sample; performing a triaxial compression experiment on the full-diameter core sample to obtain dynamic parameters and static parameters of the full-diameter core sample; constructing a first corresponding relationship between the static parameters of the target rock sample and the dynamic parameters of the full-diameter core sample; constructing a second corresponding relationship between logging data and the static parameters of the target rock sample according to the first corresponding relationship between the static parameters of the target rock sample and the dynamic parameters of the full-diameter core sample; and drawing a formation mechanical property profile according to the second corresponding relationship. The above method can solve the problem that a complete full-well-section mechanical property profile cannot be continuously drawn in the prior art.

The utility model relates to the technical field of triaxial compression experiments, and discloses an anti-leakage stabilizing device based on a triaxial compression experiment, which comprises a first experiment connecting seat for the triaxial compression experiment and a second experiment connecting seat for the triaxial compression experiment, and an experiment test piece is arranged between the first experiment connecting seat and the second experiment connecting seat. The first clamping assembly is arranged on the outer side of the first experiment connecting seat and is used for fastening the joint of the first experiment connecting seat and the experiment test piece, so that oil liquid is prevented from entering the first experiment connecting seat from a connecting gap between the first experiment connecting seat and the experiment test piece. The anti-leakage stabilizing device based on the triaxial compression experiment aims to solve the problem of oil leakage caused by a gap between a test piece and a connecting seat in the triaxial compression experiment.

This invention provides a method and system for dynamic damage evolution of surrounding rock in underground spaces based on seismic response, belonging to the field of numerical simulation technology for underground rock masses. The invention involves drilling rock samples and measuring their static and dynamic parameters, combined with dynamic triaxial compression tests to generate energy dissipation rate and failure threshold. Subsequently, seismic wave data are collected and synthesized to construct a physical model of the underground cavern to simulate geostress conditions, analyzing its dynamic response characteristics under different seismic waves. Furthermore, a three-dimensional numerical model is established to calculate the total stress output of P-waves and S-waves, and compared with a safety threshold to determine the degree of damage to the surrounding rock. This method significantly improves the accuracy and reliability of damage assessment of underground surrounding rock under seismic loading.

The invention belongs to the technical field of shale seepage mechanics and numerical simulation, and discloses a shale triaxial compression numerical simulation method based on a seepage-mechanics coupling effect. Existing numerical simulation only considers a mechanical field or a seepage field, and neglects a bidirectional coupling effect between the two fields. The problems of unreasonable boundary conditions, untight crack and seepage coupling and the like are solved, and the failure rule of the shale under the seepage action is difficult to reflect truly. According to the shale triaxial compression numerical simulation method based on the seepage-mechanical coupling effect, a shale mesoscopic model is established through a particle flow numerical method, a seepage field is solved through a finite volume method, and bidirectional coupling of the seepage field and a mechanical field is achieved. The device can dynamically simulate fracture initiation, expansion and penetration processes of shale under the action of seepage-mechanical coupling, accurately predicts mechanical properties and permeability evolution of shale, and is suitable for shale gas development, borehole wall stability analysis and underground engineering safety evaluation.