165 results about "Triaxial shear test" patented technology

The invention relates to the technical field of mine safety monitoring, and discloses a roadway surrounding rock stability evaluation method, which comprises the following steps: step 1, collecting roadway surrounding rock geological data, step 2, constructing a three-dimensional geomechanical model, step 3, inverting mechanical parameters, step 4, calculating a stability coefficient, and step 5, outputting an evaluation result. According to the method, rock mass types, structural plane occurrence, crustal stress vectors and permeability parameters are integrally collected through geological radar scanning, drilling coring and crustal stress measuring devices, the problem of model distortion caused by single data in a traditional method is solved, deformation of a stress concentration area is accurately captured by adopting a non-uniform grid division strategy, inversion mechanical parameters are combined, and the method is suitable for large-scale popularization and application. The network is trained by using in-situ direct shear and triaxial test data, the inversion efficiency is improved compared with manual trial and error, the whole surrounding rock fracture process is simulated based on a finite element-discrete element coupling algorithm, plastic zone distribution and a comprehensive index S are output, and automatic judgment of the stability level is realized.

The invention provides a method for establishing a deep hard rock dynamic disturbance three-dimensional mechanical model, and relates to the technical field of rock mechanical properties and engineering. The method comprises the following steps: carrying out a true triaxial test without power disturbance and a true triaxial test under the action of power disturbance on a deep hard rock taken from a certain tunnel project in the deep part, and recording test data of the whole mechanical behavior process of each test; determining failure modes of the deep hard rocks under different dynamic disturbances by comparing all the tested deep hard rocks; the method comprises the following steps: determining a parameter evolution model of cohesion and an internal friction angle under the dynamic disturbance true triaxial condition by constructing a mechanical model of a deep hard rock under the dynamic disturbance true triaxial condition on the basis of mechanical behavior whole-process test data of the deep hard rock under the dynamic disturbance action and failure modes of the deep hard rock under different dynamic disturbances; according to the method, the mechanical behavior of the hard rock under the influence of multi-source dynamic disturbance can be predicted, and a basis is provided for surrounding rock stability evaluation in the construction process of a deeply-buried hard rock area.

The invention discloses a shear strength parameter determination method considering earthquake action, which comprises the following steps: collecting a soil sample of a research area, air-drying, dispersing the soil sample into single particles, and sieving to obtain the stone content of the soil sample; the method comprises the following steps: preparing a compacted cylindrical sample from a soil sample, and placing the compacted cylindrical sample in a triaxial testing machine for a triaxial test to obtain static strength parameters of the soil sample; collecting seismic magnitude data of the research area, and determining the seismic magnitude of the research area; and according to the stone content, the static strength parameter and the earthquake magnitude, calculating the shear strength parameter of the research area under the earthquake action by adopting a shear strength damage cracking model. Based on PFC numerical simulation software, dynamic triaxial numerical simulation of the accumulation body is carried out and compared with an indoor test result, the change rule and numerical value of the numerical simulation result are close to those of the indoor test result, the parameter error is smaller than 50%, and the reasonability of the established accumulation body sample model and the calculated dynamic strength parameters is verified.

The invention discloses a rock shear seepage coupling true triaxial test system, which relates to the technical field of rock mechanical tests, and comprises a host, a sigma 1 / sigma 2 direction loading module, a sigma 3 direction confining pressure module, a pressure chamber auxiliary system, a sample clamp, a pore water seepage system, a temperature system, a control module and a data acquisition and processing module, through servo closed-loop linkage double-pump loading in the sigma 1 / sigma 2 direction, synchronous output of the double pumps and coordination of pressure supply of the two oil cylinders by the controller, a strain correction algorithm is combined, stability of a stress loading center is guaranteed, strain measurement accuracy is improved, confining pressure is accurately controlled in the sigma 3 direction through a double-balance pressure chamber and a pressure regulation algorithm, and the stress measurement accuracy is improved. The pressure chamber is in full-automatic operation, manual steps are omitted, errors are reduced, efficiency is improved, a stress-free blank angle clamp eliminates friction interference, a seepage system supports a double-loading mode, a control module achieves multi-control-mode impact-free switching, a data processing module is combined with an elastic modulus calculation algorithm, rock mechanical parameters are accurately obtained, and the multi-field coupling test requirement is met.

The invention provides a high-stress rock mass disturbance catastrophe real-time early warning method based on a fracture comprehensive signal, which belongs to the technical field of geotechnical engineering, and constructs a comprehensive acoustic parameter ASCP by fusing various parameters such as amplitude, dominant frequency, energy distribution, crack fractal characteristics, rock mass fracture event density and the like in an acoustic emission signal. The calculation process is combined with contribution weights of different parameters to the destruction stage, and weight values are jointly calibrated through data analysis. On the basis of a large amount of engineering field monitoring and indoor true triaxial test data, the evolution law of the ASCP in the rock mass damage process is analyzed, multiple early warning thresholds of an ASCP evolution curve starting early warning threshold and an ASCP catastrophe early warning threshold are provided, and the early warning accuracy and timeliness are improved. According to the early warning method, various parameters of sound signals are integrated, a multi-threshold early warning method is established, the contribution degrees of various main sensitive parameters of high-stress rock mass disturbance damage sound emission are integrated, and the early warning accuracy, timeliness, high efficiency and economical efficiency are improved.

The invention relates to a method for simulating a complex earthquake load in a triaxial test, and belongs to the field of geotechnical engineering indoor test methods. The invention mainly overcomes the defects in the prior art, and provides a simulation method for complex earthquake load in a triaxial test, which comprises the following steps: acquiring a near-field strong earthquake record, and carrying out baseline correction and filtering processing on the near-field strong earthquake record; decomposing and synthesizing the near-field strong earthquake record; performing time-history conversion on the near-field strong earthquake record, and determining experimental parameters; preparing a soil-rock mixture sample, and saturating the sample; performing an indoor triaxial test on the saturated sample according to the determined experimental parameters; calculating the correlation between the input waveform and the output waveform according to the test result; and analyzing typical dynamic characteristics of the soil-rock aggregate under the action of the near-field strong earthquake according to a test result. The invention provides a method for analyzing test data under the action of earthquake load, and provides an indoor triaxial test method for carrying out research on dynamic characteristics of a rock-soil body by near-field strong shock of an active fault zone.

The invention relates to the technical field of rock indoor loading tests, in particular to an intelligent true triaxial mechanical test system and method based on parameter self-adaptation, and the method comprises the following steps: S1, testing a known rock sample based on known test data, historical parameter data, historical operation data, historical experiment data and rock characteristic data of the rock sample are obtained; s2, marking corresponding time points for the historical parameter data and the historical experiment data based on the operation time data to obtain a parameter subset and an experiment subset; s3, analyzing the parameter subset and the experiment subset to obtain an intervention relation; s4, determining a data relationship between the rock characteristics and test parameters of true triaxial test equipment to obtain a basic parameter relationship; s5, testing and data monitoring are carried out on a rock sample to be tested, rock experiment data are obtained, judgment and self-adaptive parameter adjustment are carried out based on the intervention relation, and the reliability and accuracy of a test result are guaranteed while the analysis rate is increased.

The invention discloses a true triaxial test device and test method capable of realizing arbitrary rotation of principal stress, and belongs to the technical field of geotechnical engineering.The true triaxial test device comprises a shear stress device, the shear stress device comprises a shear stress pressure head used for being connected with the surface of a sample, and the shear stress pressure head is connected with two shear stress applying systems; the shear stress applying system applies shear stress parallel to the surface of the sample to the sample, and the directions of the two shear stresses are vertical; the main stress device is connected with the shear stress pressure head, and the main stress device applies pressure perpendicular to the surface of the sample to the sample. According to the invention, random rotation of the principal stress can be realized through the shear stress device, so that the direction and size of the principal stress applied to the rock sample can simulate a real path to continuously change, and the deformation fracture behavior in the rock mechanical bearing process can be more accurately obtained; and a technical support is provided for correctly and accurately evaluating the bearing characteristic, the fracture characteristic and the instability mechanism of the rock.

The invention relates to the technical field of geotechnical engineering intelligence, in particular to a multi-field coupling intelligent triaxial test method and system combined with machine learning, and the method comprises the following steps: initializing a test device, and establishing a material parameter prior distribution function; defining a target test path and obtaining a target control sequence; acquiring real-time test data through a multi-source fusion sensing array, and preprocessing the real-time test data to obtain multi-dimensional feature fusion data; establishing an online parameter identification module to obtain real-time correction material parameters; establishing a heat-water-force multi-field coupling prediction model to obtain an optimal control sequence; acquiring latest test data, and performing rolling optimization on the model to establish a lightweight control model; and generating an intelligent control instruction to realize self-adaptive intelligent control of the triaxial test. According to the invention, through combination with machine learning, the spanning of the triaxial test from experience control to intelligent control is realized, and an intelligent technical means is provided for the research of the multi-field coupling characteristic of the geotechnical material.

The invention discloses a visual seepage test device and method for shear fracture of a rock structural surface under true triaxial. The visual seepage test device comprises a fixed base, a lower shear box, an upper shear box, a seepage water inlet pipe, a seepage water outlet pipe, a seepage water inlet shear head and a seepage water outlet shear head, the fixed base is connected with a normal loading block of a true triaxial testing machine through pin nails, the lower shear box is fixed on the fixed base, the upper shear box and the lower shear box are oppositely arranged, and the seepage water inlet shear head and the seepage water outlet shear head are respectively embedded into the lower shear box and the upper shear box to form a water injection cavity I and a water injection cavity II; after the lower shearing box and the upper shearing box are closed, a closed sample cavity for clamping a rock sample and a transparent block is formed, and meanwhile, the water injection cavity I and the water injection cavity II form a seepage cavity. According to the device and the method, the visual shear simulation of the rock mass structural surface under the multi-field coupling environment of true three-dimensional stress-high osmotic pressure-chemical corrosion and the like is realized.

The invention belongs to the technical field of geotechnical engineering and rock mechanics testing, discloses a stress-strain mixed control-based rock stable failure testing method, and aims to solve the problem that a stress path cannot be maintained and brittle failure cannot be inhibited simultaneously after rock peak strength is detected in an existing true triaxial test. The method comprises the following core steps: firstly, determining a target stress state and a strain growth rate threshold value; then hydrostatic pressure loading is carried out; loading and unloading at a fixed proportional rate in a stress control mode; and when the strain rate reaches a threshold value, switching to a stress-strain hybrid control mode, converting the maximum principal stress direction into strain control to stabilize the damage process, and dynamically coordinating stresses in the other two directions based on real-time feedback to enable the whole damage process to maintain a preset stress path all the time. According to the invention, the complete and stable test of the pre-peak-post-peak mechanical behavior of the rock under any complex stress state can be realized, and a key technical support is provided for accurately verifying the strength criterion and researching the failure mechanism.

This invention discloses a temperature-compensated seepage-shear coupling true triaxial testing apparatus and control method. The apparatus includes a pressure chamber, a shear box, a temperature control system, a pressure application system, and a temperature-displacement corrector. The shear box is housed within the pressure chamber. The temperature control system includes a heat transfer jacket, multi-point thermometers, and a temperature controller. The heat transfer jacket is fitted over the shear box, and the multi-point thermometers are located within the cavity. The pressure application system includes a confining pressure loading device, a pressure head, and a pressure controller. The confining pressure loading device injects a confining pressure medium into the pressure chamber, and the pressure head applies a force to the shear box. The temperature-displacement corrector is electrically connected to the temperature control system and the pressure application system. This apparatus features a temperature control system to precisely regulate the temperature during the test, thereby simulating deep environments at different temperatures. Furthermore, the temperature-displacement corrector dynamically corrects the force applied by the pressure application system, reducing additional forces caused by thermal expansion or contraction and improving stress control accuracy.

This invention relates to the field of deep learning technology, specifically to a numerical simulation method for true triaxial tests of coarse-grained soil materials based on principal stress effects. The method includes the following steps: acquiring three-dimensional geological parameters and boundary condition data of the coarse-grained soil material; and constructing a true triaxial finite element simulation model of the coarse-grained soil based on the three-dimensional geological parameters and boundary condition data. This invention utilizes a loading increment step size for trial calculations and calculates the reward function value based on the convergence state and iteration count of the trial calculation results to update the network parameters, enabling the control strategy to continuously evolve through interaction with the environment. This allows for the identification of dangerous regions with highly nonlinear constitutive relations or near-singular stiffness matrices. In these regions, the step size is automatically reduced to ensure computational convergence, while in stable regions, the step size is increased to improve computational efficiency. This solves the problem that traditional fixed step sizes or simple adaptive step sizes easily lead to computational divergence or excessive iterations under complex stress paths.

The invention discloses a true triaxial test device for rock heat conduction parameter in-situ measurement under a controllable temperature-stress coupling condition. The device comprises a triaxial pressure chamber, a temperature adjusting system, a double-electric servo loading system and an automatic control unit, the temperature adjusting system tightly surrounds the outer side wall of the triaxial pressure chamber, and the temperature applying value of the temperature adjusting system ranges from 10 DEG C to 150 DEG C; an upper seat and a base are arranged at the upper end and the lower end of the triaxial pressure chamber respectively, and a test space is defined by the triaxial pressure chamber, the upper seat and the base; the upper end of the side wall of the testing space is provided with an exhaust channel and a temperature sensor channel which are communicated with the outside from inside to outside, and the lower end of the testing space is provided with an oil conveying pipeline and a flat cable channel. The device has the advantages of being simple in structure, convenient to use and high in precision. The invention further discloses a method of the true triaxial test device for in-situ measurement of the heat conduction parameters of the rock under the controllable temperature-stress coupling condition.

The invention discloses a test device and method for simulating fracture of a mine earthquake source. The method comprises the following steps: putting a rock sample into the test device and mounting the test device to a triaxial testing machine; a loading method is determined according to the fracture type of the mine earthquake source needing to be simulated, a triaxial testing machine is used for applying load, and if pressure or tension needs to be applied to the rock sample, the tension or pressure is applied to the inner frame to drive the upper clamping part and the lower clamping part to apply required stress to the rock sample; when shear force needs to be applied to the rock sample, pressure is applied to the two shear stress loading parts at the same time, then the lower clamping part is driven to move along the horizontal sliding groove relative to the upper clamping part, the needed shear force is applied to the rock sample, and a compression-shear composite fracture or tension-shear composite fracture test is achieved. The fracture processes of different mine earthquake sources are effectively simulated, so that the acoustic emission data corresponding to the fracture processes of the different mine earthquake sources are obtained, and data support is provided for revealing fracture evolution mechanisms of the different earthquake sources and disaster source early warning.

The invention relates to the technical field of geotechnical engineering tests, in particular to a modular three-way confining pressure seepage loading box and a triaxial test system and method. The loading box comprises an outer box body, a loading seepage assembly and a force transmission assembly; the outer box body is internally provided with a sealing chamber for accommodating a test block, the outer wall of the outer box body is provided with a seepage interface communicated with the sealing chamber, and the top surface and the side surface of the outer box body are provided with loading holes; the loading seepage assembly is arranged between the test block and the outer box body and comprises a bearing plate and a loading plate, the bearing plate and the loading plate are respectively divided into a seepage plate and a non-seepage plate, the inner end face of the seepage plate is provided with a seepage channel, and the inner end face of the non-seepage plate is a plane and is in sealing contact with the test block; the force transmission assembly is installed on the loading hole of the outer box body, and the inner end of the force transmission assembly abuts against the loading plate. According to the loading box, three-way confining pressure seepage coupling tests under various working conditions are carried out with lower cost and higher flexibility on the premise that core triaxial equipment is not transformed.

The invention provides a static and dynamic triaxial test method and system for realizing an ultralow confining pressure environment, and belongs to the technical field of geotechnical engineering. The method comprises the steps that a triaxial test system is assembled, the triaxial test system is provided with a loading space so as to conduct triaxial loading on a sample, and the sample comprises an elastic sample and a soil body sample; the elastic sample coated with the latex film is arranged in a loading space for triaxial loading; acquiring a strain and stress relationship of the elastic sample coated with the latex film so as to acquire a correction relationship between the latex film and the deformation of the sample; the soil body sample coated with the latex film is arranged in a loading space for triaxial loading; in the process of obtaining the strain and stress relationship of the soil body sample coated by the latex film, the stress of the soil body sample is corrected according to the correction relationship between the latex film and the deformation of the sample. The triaxial test method provided by the invention can reduce the influence of the latex film on the mechanical behavior of the soil body sample so as to obtain a more accurate strain and stress relationship of the soil body sample.

The application discloses a variable-angle triaxial test device for simulating cross-tunnel excavation and considering external disturbance, which comprises a counterforce frame, a hydraulic loading module, a vertical disturbance module and a variable-angle triaxial test module arranged on the counterforce frame, lateral confining pressure is applied through first and second horizontal loading oil cylinders, vertical load is applied through a vertical loading oil cylinder, until a set stress state is reached, vertical disturbance to the rock sample is formed by vertically moving the disturbance block along the slide rail, and cross-tunnel excavation simulation is performed on the rock sample through the excavation hole. In the case of realizing the conventional six-surface loading true triaxial test, cross-tunnel excavation is simulated, and disturbance can be applied in the vertical direction, thereby realizing single-hole, cross-double-hole excavation of the rock sample under the true triaxial loading condition and stability analysis of the rock sample under vertical disturbance after the excavation is completed.

The application belongs to the technical field of road engineering and relates to a static pressure demolding integrated geotechnical triaxial shear sample static pressure forming device and method. The device comprises a lower support module, a sample containing module, a force transmission module and a demolding elongation middle section. The lower support module comprises a static pressure demolding support, a sample containing barrel limiting hole penetratingly arranged at the top of the static pressure demolding support and a static pressure bearing table detachably arranged at the sample containing barrel limiting hole. The sample containing module comprises a sample containing barrel provided with a through hole communicating with the sample containing barrel limiting hole. The force transmission module is arranged at the upper opening of the through hole and used for applying static pressure to the soil sample to be statically pressed. The demolding elongation middle section is used for abutting against the force transmission module after the static pressure bearing table is removed from the sample containing barrel limiting hole, so as to push the geotechnical triaxial test sample out of the sample containing barrel limiting hole. Compared with the prior art, the application has the advantages of simple sample preparation, scientific method, small mold deformation and strong economy.

The present application relates to the field of testing and numerical analysis control technology, and in particular to a simulation method, apparatus, equipment, medium, and program for a true triaxial test. The method comprises: obtaining a test target for the true triaxial test; determining a specimen based on the test target and applying a preset axial strain increment to the specimen; collecting the true axial stress value, the true longitudinal stress value, the true transverse stress value, and the axial strain of the specimen; identifying a stress control target and a drainage control target within the test target, calculating a transverse stress target based on the true longitudinal stress value and the true axial stress value, generating a strain control matrix based on the stress control target, the drainage control target, the true axial stress value, the true longitudinal stress value, and the axial strain; and controlling the specimen to apply strain increments in three directions based on the strain control matrix to obtain simulation results of the true triaxial test. This method solves the problem in related arts that the simulation model for true triaxial testing cannot meet the requirements of various drainage conditions, resulting in low applicability and practicality.

The invention discloses an acoustic emission monitoring clamp box for disturbing a true triaxial test and a use method of the acoustic emission monitoring clamp box. The acoustic emission monitoring clamp box comprises a box body, a sensor mounting assembly, a sample fixing assembly, a sealing assembly and an anti-interference assembly, the box body is of a hollow cubic structure, openings are respectively formed in six surfaces of the box body, and the sensor mounting assembly and the sample fixing assembly are respectively mounted at the openings of the box body; the sealing assembly is used for enhancing the sealing performance of the box body, and the anti-interference assembly is used for reducing external interference; the side wall of the box body is provided with a cable hole with a rubber sealing ring. By arranging the sensor mounting assembly, stable mounting and position adjustment of the acoustic emission sensor can be realized, good contact between the acoustic emission sensor and the sample is ensured, and the accuracy of a monitoring signal is improved. The sample fixing assembly can adapt to samples of different sizes, has a good fixing effect, prevents the samples from sliding in the test process, and ensures smooth proceeding of the test.

The invention discloses a rock-fill dam deformation analysis model updating method considering damming material parameter correlation, which comprises the following steps: firstly, collecting triaxial test parameters of a plurality of rock-fill dams with different dam types and lithology in the world, quantifying parameter correlation strength, constructing a priori knowledge model in combination with a variational auto-encoder, and mining a parameter internal correlation mode to provide physical constraints; secondly, generating a parameter sample by adopting a Latin hypercube sampling mode, constructing a data set in combination with finite element simulation, training a deep neural network agent model fused with spatial-temporal characteristics, and realizing high-precision mapping of damming material parameters and global deformation response; then introducing an elite archiving strategy to improve a multi-objective optimization algorithm NSGA-III; then DPK-VAE, a DNN proxy model and an improved NSGA-III are integrated, a multi-objective optimization framework is formed, and parameter optimization of the constitutive model of the damming material is completed so as to achieve updating of a rock-fill dam deformation analysis model; and finally, calculating a global deformation field and key safety indexes based on the updating model, and realizing thorough perception of the deformation character and the operation state of the dam body.

The invention discloses a covering layer foundation soil dynamic pore pressure-deformation indoor triaxial test method for reflecting an earthquake loading process, and belongs to the field of geotechnical engineering and earthquake engineering. Firstly, a numerical geometric model is created, and soil physical and mechanical parameters are input; secondly, carrying out power time history response analysis, outputting seismic dynamic stress response time histories of soil mass units at different positions and different depths in a numerical simulation result, and converting the seismic dynamic stress response time histories into test control loads; thirdly, carrying out an indoor dynamic test, loading a test control load, and collecting dynamic response data of the soil body under the earthquake action; and finally, on the basis of the dynamic response data, determining dynamic test results of all units of the covering layer by adopting an interpolation method according to stress states and dynamic strain amplitude interpolation, and completing dynamic characteristic analysis. According to the method, excessive simplification and blind test of a traditional test can be avoided, the authenticity and accuracy of the foundation soil dynamic test are remarkably improved, and the method is suitable for accurate evaluation of the dynamic characteristics of the ultra-deep soft covering layer foundation soil.

This invention provides a method and system for predicting the long-term strength of hard rock under the influence of dynamic disturbance frequency in true triaxial tests, relating to the field of deep engineering safety evaluation technology. The method includes: acquiring dynamic disturbance parameters, rock compression process data, and fracture morphology data from long-term dynamic disturbance true triaxial tests; constructing characteristic curves based on the rock compression process data; performing equivalent static mapping based on the dynamic disturbance parameters and characteristic curves to obtain the equivalent static stress state under the limiting frequency condition; fitting the equivalent static stress state to obtain the predicted long-term strength value under the equivalent static condition; constructing a model based on the characteristic curves and fracture morphology data to obtain a multi-dimensional criterion score; and judging and correcting the predicted long-term strength value based on the multi-dimensional criterion score to obtain the output result. This invention achieves quantitative characterization and accurate prediction of the long-term strength under true triaxial conditions for the influence of high-frequency, long-term dynamic disturbances.

The invention discloses a three-dimensional random field-based rockfill material space variability discrete element simulation method. The method specifically comprises the following steps of: 1, constructing a triaxial test discrete element model and determining related parameters; step 2, generating a three-dimensional random field based on Karhunen-Loeve expansion; and step 3, random interpolation and assignment of particle contact parameters. Aiming at the technical defect that the real mechanical behavior of the rockfill material cannot be accurately reflected due to the fact that homogeneous hypothesis, two-dimensional modeling and continuous medium analysis are generally adopted in the prior art, the method comprises the following steps: constructing a three-dimensional random field of the rockfill material and introducing a discrete element particle system; more reasonable and more practical description of rockfill material space variability, macroscopic mechanical characteristics and mesoscopic mechanism deformation is realized.

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 basalt fiber cement silty soil dynamic elastic modulus estimation method for a subgrade in a seasonal frozen region, which comprises the following specific steps: preparing a sample, performing a freeze-thaw cycle test on the sample, then performing a graded loading dynamic triaxial test to obtain dynamic stress and dynamic strain of a soil body under different confining pressures, drawing a hysteretic curve, and estimating the dynamic elastic modulus of basalt fiber cement silty soil on the basis of a Hardin-Drnevich hyperbola model. The maximum dynamic elastic modulus and the final dynamic stress amplitude of the sample are obtained, reference dynamic strain is introduced, and the normalized secant dynamic elastic modulus is obtained; based on a nonlinear least square method, statistical analysis is carried out on test data under the action of different confining pressures and freezing and thawing cycle times, and a pre-estimation model representing correlation between the maximum dynamic elastic modulus and the final dynamic stress amplitude and the confining pressures and the freezing and thawing cycle action times is obtained; through nonlinear regression analysis, obtaining a prediction model of the maximum dynamic elastic modulus and the final dynamic stress amplitude considering the confining pressure and the freeze-thaw cycle effect, and further obtaining a normalized secant dynamic elastic modulus; the method improves the estimation efficiency.

The utility model discloses a frame pushing device for a rock test, and relates to the technical field of rock true triaxial tests. The device comprises a supporting frame, and further comprises a pushing part which is installed on the supporting frame and used for supporting, and a supporting part which is installed on the supporting frame and used for supporting the supporting frame. The number of the quick mounting parts is multiple, and the multiple quick mounting parts are all arranged on the pushing part; the number of the anti-falling parts is multiple, and the multiple anti-falling parts are located on the multiple quick mounting parts correspondingly; the plurality of quick mounting parts are distributed in an array, the anti-falling parts are distributed in an array, and the pushing part is used for supporting the plurality of quick mounting parts and the plurality of anti-falling parts. By arranging the quick mounting part, the problems that in the using process of the device, the frame main body and the mounting plate are inconvenient to quickly mount and dismount, workers need to spend a lot of time to position and mount the frame main body and the mounting plate, time and labor are wasted, burdens are brought to the workers, and the overall experiment progress is delayed are solved.

The application discloses a kind of building solid waste-red clay mixed roadbed filler permanent deformation estimation model and modeling, estimation method, the maximum dry density, optimum moisture content and CBR value of building solid waste-red clay mixed roadbed filler under different building solid waste incorporation rate are determined by compaction test, California bearing ratio test;Prepare the building solid waste-red clay sample of different building solid waste incorporation rate, carry out dry-wet cycle test to it, carry out triaxial test to the sample after preset dry-wet cycle number, determine its resilience modulus and permanent deformation;Establish the elastic deformation increment estimation model considering building solid waste incorporation rate, dry-wet cycle number comprehensively, and then obtain the permanent deformation estimation model considering stress-strain relationship, physical state, cycle loading number, building solid waste incorporation rate, dry-wet cycle number comprehensively, then the permanent deformation of building solid waste-red clay mixed roadbed filler is accurately and quickly estimated using the permanent deformation estimation model.

The invention belongs to the technical field of geotechnical engineering tests, and particularly discloses a true triaxial rock sample strain test device and method based on DIC, the device comprises a true triaxial test system and a DIC system, the true triaxial test system applies a three-way load to a rock sample through six independent loading heads, and the DIC system is used for loading the rock sample; and the DIC system measures the strain of the sample in real time in a non-contact manner based on a DIC algorithm by utilizing a speckle pattern on the surface of the loading head and an image acquisition assembly. Compared with a traditional contact sensor, a sensor does not need to be arranged on the surface of the sample, the test process is simplified, the damage risk of the sensor is avoided, the test efficiency and the measurement precision are remarkably improved, and the method is suitable for efficient research of rock mechanical properties under a complex stress path.