34 results about "Fracture test" patented technology

The invention relates to the technical field of oil field reservoir research, in particular to a fracturing fracture imaging physical simulation method and system combined with non-uniform contact electrodes, and the method comprises the steps: carrying out the resistance modal detection at the current time step through a low-frequency excitation signal in the fracture propagation simulation process, and obtaining a corresponding electric signal; obtaining a conductive fluid distribution result of the rock core fracturing test piece at the current time step by using the conductive fluid distribution inversion model; and fitting and comparing the electric field distribution result of the current time step with the conductive fluid distribution result of the current time step, and outputting the fracture parameters and the conductive fluid distribution result of the rock core fracturing test piece at the current time step based on the fitting and comparison result. According to the method, the electrical property change caused by the natural fracture and the fluid contained in the natural fracture is directly sensed in situ, the electrical signal is acquired, the response delay is reduced, the conductive fluid distribution inversion model is constructed by combining prior knowledge and deep learning, and the precision and reliability of conductive fluid distribution inversion are effectively improved.

The application discloses a method for determining the allowable damage scale of concrete based on a fracture extremum theory, which comprises the following steps: S1, carrying out a fracture test to obtain a peak load; S2, calculating a stress intensity factor generated by an external load and cohesive force according to a stress intensity factor manual; S3, establishing a crack tip stress intensity factor balance equation according to a crack propagation criterion, and then deducing an expression of the external load; S4, determining a critical effective crack length of the concrete according to the fracture extremum theory; and S5, calculating the allowable damage scale according to the critical effective crack length. The method for determining the allowable damage scale of concrete based on the fracture extremum theory is adopted, the fracture extremum characteristics of the concrete are fully considered, the peak load of the fracture test needs to be measured only when the method is applied to analyze the crack propagation of the concrete, the test operation is simple, the calculation result is high in accuracy, and the method is suitable for test pieces of different sizes and types.

The application discloses a fracturing stress and fracturing fluid action range analysis method based on post-press coring, and the method is as follows: obtaining a pre-press rock contrast sample; obtaining a core through post-press coring after a fracturing test, and constructing a spatial hydraulic fracture three-dimensional model; obtaining a rock sample; obtaining a microstructure and mechanical parameters of the rock sample; comparing the microstructure and mechanical parameters of the rock sample with those of the pre-press rock contrast sample corresponding to the sampling position, and determining whether the sampling position of the rock sample is subjected to liquid spread and stress spread; and obtaining a hydraulic fracture liquid and stress spread range diagram. The method has the beneficial effects that the parameters involved in the method are objective and accurate, the limitations of indirect monitoring and simulation of the fracture network through microseismic and numerical simulation methods are avoided, the result accuracy is greatly improved, and the method provides a reference for actual construction.

This invention relates to the technical field of deep well mining, and particularly to a real-time analysis and early warning method for true triaxial hydraulic fracturing test data. The method includes the following steps: acquiring multi-source monitoring data during the true triaxial hydraulic fracturing test, wherein the multi-source monitoring data includes mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; assigning verification weights matching the test conditions based on the heterogeneous attributes of the mechanical property data, fluid parameter data, deformation monitoring data, and fracture evolution correlation data; and verifying the acquisition timestamps and range matching of each data point using the verification weights to generate a standard dataset. The real-time analysis and early warning method for true triaxial hydraulic fracturing test data provided by this invention can simultaneously capture the stress field, fluid transport, deformation state, and internal fracture evolution characteristics of rock samples, improving the comprehensiveness of rock sample condition characterization and solving the problem of one-sided condition perception.

The invention relates to a method for predicting fracture properties of composite materials with different fiber orientations based on a composite trilinear cohesion model. The method comprises the following steps: 1) preparing a sample; 2) performing a fracture test and recording data; 3) calculating fracture toughness; 4) performing finite element modeling on the cohesion constitutive model; 5) performing grid division; and 6) fracture performance prediction based on different fiber orientation angles. According to the method, the composite cohesion model which is suitable for different fiber directions and has relatively high description capability and easily acquired parameters is provided, and the relationship between the key parameters of the composite trilinear cohesion model and the orientation angle is established, so that rapid and accurate prediction of the fracture toughness under different orientations is developed; the method has important engineering significance for improving FRPC fracture performance prediction efficiency and precision.

The invention relates to a method for testing a fracture track of a metal material under a multi-field coupling effect. The method comprises the steps of sample preparation, high-temperature speckle preparation, sample loading, strain field acquisition, fracture morphology observation, data processing and fracture model establishment. By constructing a new fracture test method under the action of multi-field coupling, the problems of lack of physical field coupling factors, non-uniform test systems, limitation of fracture models and the like at present are effectively solved. A coupling loading test system capable of synchronously applying complex stress, high strain rate and transient high temperature is established, and real simulation of the multi-physical field coupling effect under the actual disaster working condition is achieved; a metal material fracture test system with universality and comparability is formed; key data support is provided for building a fracture model comprehensively considering the stress three-dimensional degree, the strain rate effect and temperature softening, the accuracy and reliability of fracture track prediction of the steel structure under the extreme disaster are remarkably improved, and an important basis is provided for engineering disaster resistance design and safety evaluation.

The invention relates to a shale gas horizontal well fracture pressure prediction method. The method comprises the steps of 1, multi-source data acquisition and intelligent depth correction, wherein logging data, element logging data, logging-while-drilling data, drilling engineering parameters and shaft track data of a target horizontal well section are acquired; 2, multi-scale feature enhancement: generating a high-dimensional feature sequence; step 3, nonlinear feature screening and mixed crustal stress prediction: screening out a key element combination, calculating an initial crustal stress profile through a traditional physical model based on sound wave and density logging data, and training a machine learning residual prediction model by taking the key element combination and other logging features as input to obtain a mixed crustal stress prediction model; adding the initial crustal stress profile and a residual error predicted value by predicting a residual error between a calculated value and an actual measured value of the physical model to obtain final predicted crustal stress data; and 4, calculating and verifying the fracture pressure: deducing the fracture pressure, and verifying a prediction result by using actual fracture test data.

The invention discloses a strap tension testing device, and particularly relates to the technical field of strap testing, the strap tension testing device comprises a mounting plate, and a support frame is arranged above the mounting plate; a cutter and a friction block are arranged below the support frame, a switching test piece is arranged between the cutter and the friction block, and a strap is arranged on one side of the cutter; the positioning cutting piece is mounted on the other side of the outer wall of the support frame; and a tension test piece is mounted on the mounting plate. By arranging the switching test piece, the cutter moves leftwards to cut and break the strap, when the friction block is selected, the stepping motor drives the friction block to drive the friction strip to make contact with the strap and rotate forwards and backwards at a small angle, the test in the abrasion state is simulated, the fracture test or the abrasion test can be flexibly selected according to needs, and the test efficiency is improved. The adjustability and applicability of the test are effectively improved, and the problems that the test is carried out under the problem that abrasion or breakage is difficult to switch, and the applicability of the test adjustability is poor are solved.

The invention discloses a multi-angle rotating ultra-high core wall dam gravel-doped clay tensile-fracture test device which comprises a mold assembly, two groups of adjusting assemblies and two groups of loading assemblies, a dumbbell-shaped cavity is formed in the mold assembly body and is used for preparing and bearing a test soil test piece; the two sets of adjusting assembly bodies are distributed on the two sides of the mold assembly body in a central symmetry mode, each adjusting assembly body comprises a rotatable semicircular disc and a semicircular disc track, the rotatable semicircular discs are coaxially embedded in the inner sides of the semicircular disc tracks, and the semicircular disc tracks are movably connected with the rotatable semicircular discs; and the end part of the mold assembly body is embedded into the inner side of the semicircular disc track and is detachably connected through a mold fixing bolt. The front loading assembly, the front assembly body, the rear loading assembly, the rear assembly body and the mold assembly body are used in cooperation, the operation process is convenient and rapid, the device can be suitable for a uniaxial tensile test, a tensile fracture test, a shear fracture test, a tension-shear fracture test and a compression-shear fracture test at the same time, and the application range is remarkably widened.

This invention specifically relates to a method and system for identifying and analyzing the causes of damage to hot recycled asphalt mixtures. The method includes: preparing recycled asphalt mixture specimens; calibrating the baseline values ​​of the chemical element content of the original asphalt, new aggregates, and new asphalt; calculating and obtaining the interface element content ratio threshold based on each baseline value to distinguish different failure causes; subjecting the recycled asphalt mixture specimens to long-term service load tests; subjecting the treated recycled asphalt mixture specimens to pull-out fracture tests, identifying the dominant damage failure mode on the main cross-section of the micro-damage cracks, and cutting and sampling the area where the dominant damage failure mode is located to obtain test blocks; detecting the elemental surface distribution of the test blocks to obtain elemental distribution data of the treated recycled asphalt mixture specimens; and generating the damage cause results of the hot recycled asphalt mixture based on the elemental distribution data and the obtained interface element content ratio threshold.

The invention discloses a design method of a turbine disc characteristic simulation piece with bolt hole induced end tooth crack propagation, and belongs to the technical field of aero-engine fatigue fracture tests. The method comprises the following steps: designing an initial shape of a simulation piece dominated by arc end teeth; through double-stage static strength analysis, the characteristic sizes of bolt holes and the like are preferentially and alternately adjusted so as to be matched with a crack-free stress field of a real turbine disc; introducing a surface crack at a dangerous point, and optimizing the crack size by taking J integral of a crack tip and a correction stress gradient from a bolt hole to the crack tip as double standards; an initial defect with the controllable size is machined through the electric spark technology; and finally, on the basis of direct-current potential drop technology monitoring, the crack is prefabricated to the target size from the defect through the fatigue load. According to the invention, high-fidelity simulation of the crack propagation behavior under the structure coupling effect is realized, and a low-cost and high-reliability test means is provided for life prediction and safety evaluation of the turbine disc.

This invention discloses a 50-70mm thick high-strength and high-toughness 10CrNi3MoCu steel plate, comprising the following chemical composition by mass percentage (wt%): C: 0.08-0.10, Si: 0.17-0.25, Mn: 0.50-0.60, P < 0.010, S ≤ 0.002, Ni: 2.3-2.4, Cr: 1.4-1.5, Mo: 0.23-0.25, Cu: 0.9-1.0, and (10*C+Cu+Mn): Ni = 0.9-1.1, Si+Mn ≤ 0.8. 0, P+S≤0.010, the rest is Fe and residual elements. After quenching and tempering, its microstructure is lower bainite + tempered sorbite + a small amount of retained austenite. Its yield strength is 580-630MPa, tensile strength is 650-700MPa, elongation at break ≥18%, reduction of area ≥50%, impact energy at -20℃ ≥300J, shear area ratio 100%, impact energy at -84℃ ≥200J, shear area ratio ≥80%, no cracks in the b=7a bending test, and the fracture surface after the fracture test is fibrous, without white spots, bright lines or penetrating cracks. It has good comprehensive performance and fully meets the quality requirements of 10CrNi3MoCu steel plate with high strength, high toughness and corrosion resistance.

The disclosure provides a crack analysis method, which can be applied to the technical fields of additive manufacturing and fracture mechanics. The crack analysis method comprises: determining a three-dimensional digital model of a biomimetic anti-fracture structure containing a designable hard fiber phase and a soft matrix phase feature; importing the three-dimensional digital model into the geometry preprocessing software of a material printing device for assembly to obtain a three-dimensional assembly model with the soft and hard phases adhered together; performing two-dimensional processing on the three-dimensional assembly digital model to obtain two-dimensional slice data containing the geometry of the soft and hard phases; importing the two-dimensional slice data into the material printing device for operation processing to obtain the optimal running track of the nozzle of the printing device and the type of material sprayed; layer by layer spraying and solidifying according to the optimal running track and the type of material sprayed to obtain a biomimetic anti-fracture structure sample containing a hard fiber and a soft matrix; performing a fracture test on the biomimetic anti-fracture structure sample, observing and analyzing the crack surface morphology and the fracture mode, and obtaining the observation results.

The invention discloses a test method for multi-angle testing of tensile-fracture characteristics of extra-high core wall gravel-doped clay. The test method comprises the following steps: planning test working conditions; preliminarily assembling the front loading component and the front assembly body, and the rear loading component and the rear assembly body; adjusting the positions of the front loading assembly and the rear loading assembly; assembling the mold assembly, and preparing a test soil test piece; adjusting the relative positions of the front loading assembly and the rear loading assembly; connecting the mold assembly with the front assembly and the rear assembly; exposing the test soil test piece; and applying an acting force and recording test data. According to the invention, measurement of tensile and fracture characteristics of a test soil test piece at multiple angles is realized; when the angle between the loading force and the test soil test piece is 0 degree, a uniaxial tensile test and a tensile fracture test can be carried out; when the angle between the loading force and the test soil test piece is 90 degrees, a shear type fracture test can be carried out; when the angle between the loading force and the test soil test piece is 1-89 degrees, tension-shear and compression-shear fracture tests can be carried out, and the research on the fracture characteristics of the soil body under the influence of different angles is perfected.

This invention relates to the field of aero-engine technology and discloses a method for predicting the fracture speed of an integral bladed disk (IBD) based on sequential sampling and a surrogate model. Utilizing a strain prediction surrogate model for analysis and calculation improves the accuracy and efficiency of predicting the fracture speed of an IBD. Furthermore, in the construction of the strain prediction surrogate model, a sequential sampling method is used to optimize the generation logic of sample points, ensuring that sample points cluster within the critical region of interest in over-speed fracture tests. This improves the accuracy of IBD estimation and lays the foundation for building a high-quality surrogate model. This invention considers the influence of uncertain parameters on IBD behavior and predicts the fracture speed range under the influence of uncertain parameters, improving the accuracy and reliability of IBD prediction and providing a more scientific basis for the design and optimization of integral bladed disks (IBDs).

The utility model discloses a medical guide wire winding rupture test device, which relates to the technical field of medical instruments, and comprises a test bed, one side of the test bed is fixedly connected with a record display screen, and one side of the test bed is provided with a supplementary coating module, the supplementary coating module comprises a support piece and two storage bins, two conveying holes are formed in one side of each of the two storage bins, conveying pipes are fixedly connected to the interiors of the four conveying holes, a plurality of mounting holes are formed in the two sides of the supporting piece, the conveying pipes are fixedly connected to the interiors of the mounting holes, and a plurality of conveying pumps are fixedly connected to the top of the supporting piece. According to the medical guide wire winding fracture test device disclosed by the utility model, when the condition that a single coating on the surface of a guide wire is fractured and falls off is detected, the fallen surface can be repaired by utilizing the supplementary coating module, so that incomplete maintenance and excessive guide wire test times caused by data loss in a later maintenance process are avoided; therefore, the safety and the reliability of the guide wire in the treatment and use process are ensured.

The invention discloses a bidirectional visual test device and method for hydraulic fracturing of crushed coal, and relates to the technical field of pressure tests.The bidirectional visual test device comprises a rack, a sample cavity, a loading device, a fracturing device and a loading plate, the sample cavity, the loading device, the fracturing device and the loading plate are installed and connected with the rack, and a sample cavity used for containing crushed coal samples is formed in the sample cavity; the loading plate is inserted into the sample cavity in a sealing fit manner through a loading hole formed in the top of the sample cavity, and the loading device outputs downward pressure acting on the loading plate; and the tail end of a fracturing pipe of the fracturing device penetrates into the sample cavity in a sealing fit manner. According to the method, the crushed coal is used as a raw material, the crushed coal sample is formed in the bidirectional visible sample cavity, and the extension process of the hydraulic fracturing fracture network in the crushed coal sample is directly observed and recorded in the hydraulic fracturing test of the crushed coal; further, the influence rule of the loading stress, the water injection flow and other parameters on the hydraulic fracturing fracture network form is obtained, and a systematic theoretical basis and technical support are provided for engineering practice.

The true triaxial hydraulic fracturing test crack propagation monitoring method of the present application comprises the following steps: adding a tracer to a fracturing fluid, injecting the fracturing fluid with the tracer into a borehole on the top surface of a rock to perform hydraulic fracturing on the rock; opening a plurality of monitoring holes extending in the up-down direction on the top surface of the rock; extending a bore scope into the plurality of monitoring holes to determine the location of the tracer in the rock, and determining the area of the crack in the rock according to the location of the tracer in the rock. Therefore, the true triaxial hydraulic fracturing test crack propagation monitoring method of the present application has the advantage of facilitating determination of the crack area.

This invention discloses a method for identifying fractures in roadway surrounding rock based on semantic segmentation and a joint loss function. The method includes constructing and labeling three types of labeled borehole fracture datasets; data augmentation and pixel binarization equalization preprocessing; pixel-level segmentation of the augmented borehole dataset; introducing a two-stage transfer learning training model; using a trained and improved Deeplabv3+ model to identify borehole fracture test sets, and evaluating the segmentation effect using MIoU and PA; batch importing the predicted fracture segmentation images of different types into ImageJ software to set pixel legend scales and obtain actual length parameters. This method reduces the model size while ensuring accurate and rapid extraction of depth feature information of annular fractures, longitudinal fractures, and fractured zones from the rock strata, and obtaining microscopic fracture quantification indicators. It achieves automated identification of borehole fractures in surrounding rock, providing a more reliable reference for evaluating roadway surrounding rock instability.

This invention relates to the field of asphalt recycling technology, specifically to a method and system for evaluating recycled asphalt mixtures with different RAP (Raponic Acid) dosages. The method includes: preparing multiple groups of recycled asphalt mixture specimens and subjecting them to aging treatment; conducting fracture and fatigue tests on each group of specimens to obtain various damage indices; determining the correlation between RAP dosage and each performance damage index, and calculating the weighting coefficients corresponding to each performance damage index for each group of specimens; calculating the durability index of the recycled asphalt mixture under different RAP dosages based on the performance damage indices and their corresponding weighting coefficients; and constructing a functional relationship between RAP dosage and the durability index. This invention establishes an index prediction function model between RAP dosage and the durability index, enabling rapid and accurate estimation of the predicted durability index in practical engineering.

The invention relates to a method for positioning bulk materials (10, 14, 15) of a certain type in a fracture chamber (1) of a testing device (2) comprising the following successive steps: - a bulk material (10, 14, 15) of this particular type is introduced into the fracture chamber (1) of the testing device (2), wherein the fracture chamber (1) has a fracture test area (25); - at least one camera (26) checks, using a stored reference image, whether the bulk material (10, 14, 15) is arranged in the fracture test area (25) of the fracture chamber (1); - if the bulk material (10, 14, 15) is not in the fracture test area (25), the bulk material (10, 14, 15) is moved in the fracture chamber (1) by a movement mechanism (7, 4) until the bulk material (10, 14, 15) is arranged in the fracture test area (25).

This invention discloses a method for testing Type I fracture under cyclic thermodynamic loading. It couples a three-point bending test with stress-temperature cycling, extending the three-point bending test to thermodynamic experimental conditions. By measuring the peak load S in the three-point bending test and the elastic modulus E in the final stress-temperature cycle, the fracture energy Gc of the Type I fracture of the specimen under cyclic thermodynamic loading can be effectively calculated. This helps to accurately reflect the bearing capacity and fracture propagation mode of the fractured surrounding rock in compressed gas storage caverns under cyclic thermodynamic loading. The method couples stress and temperature cycles and measures the change in the elastic modulus of the specimen under cyclic stress and temperature. This method has the advantages of simple steps, quick and convenient testing, and strong practicality. It is easy to operate, has a wide range of applications, and can be combined according to different actual working conditions to meet the needs of Type I fracture testing under different specimen materials, loading temperatures, and loading conditions.

The invention provides a fracture test acoustic emission and high-speed imaging synchronous monitoring system and monitoring method, and belongs to the technical field of material fracture test monitoring. The monitoring system comprises a loading test device, an acoustic emission monitoring device, a high-speed imaging device and a synchronous control system, the synchronous control system collects a load signal output by the loading sensor and generates a synchronous pulse through a peak detection algorithm when the load reaches a peak value, and the synchronous pulse is recorded by the acoustic emission system and triggers the high-speed camera at the same time, so that a unified time reference is established, and accurate alignment of acoustic emission data and high-speed image data is realized. The system is simple in structure, high in synchronization precision and capable of stably capturing the rapid crack initiation and expansion process near the fracture peak value.

The invention relates to a material stress corrosion multi-dimensional testing device and method based on a counter-pull design in an impurity-containing ammonia hydrogen environment. The testing device integrates three functional modules, namely a slow strain tensile test module, a dynamic fatigue test module and a fracture toughness evaluation module, so that comprehensive detection of stress corrosion resistance of a material in a high-pressure impurity-containing ammonia hydrogen environment is realized; establishing a material stress corrosion multi-dimensional testing device consisting of a stress corrosion resistance evaluation platform, a gas supply system, a temperature control system, a microscopic observation system and a signal processing system; the device can be used for fatigue fracture test, slow strain rate tensile test and fracture toughness test of the same sample at the same time. In the impurity-containing ammonia hydrogen environment, the gas reference is quantitatively allocated through the gas supply system, and the pressure and temperature are regulated and controlled through the water bath box; the high-pressure impurity-containing ammonia hydrogen environment test device is formed by carrying a high-pressure reaction kettle on a loading rod, a gas interface is arranged on the high-pressure reaction kettle, a sample is arranged in a high-pressure test cavity and is fixed by a bracket, and a tensile test is performed on the sample by adopting a counter-pull design.

This invention relates to an auxiliary device for a dry hot rock cold damage fracture test. The technical solution adopted by this invention is: an auxiliary device for a dry hot rock cold damage fracture test, characterized in that: it has a base plate for placement; on the base plate, via a transport mechanism, is an injection mechanism for filling the edge of the gap between two samples with epoxy resin and sealing the gap; on both sides of the base plate where the samples are placed, there are water pipe installation mechanisms for embedding water pipes into the epoxy resin between the two samples. Thus, the transport mechanism drives the injection mechanism to move uniformly around the samples on the base plate, facilitating the uniform injection of epoxy resin into the edge of the gap between the two samples; the water pipe installation mechanisms facilitate the installation of two water pipes into the epoxy resin on both sides of the samples, one water pipe serving as an inlet pipe and the other as an outlet pipe, realizing water circulation between the samples and the outside environment.

This invention provides a high-temperature creep life prediction method based on creep deformation mechanism, including conducting creep fracture tests on materials at different stress levels at different test temperatures; establishing a functional relationship between steady-state / minimum creep strain rate and stress σ and temperature T based on the creep fracture tests, denoted as Equation 1; obtaining the relationship between creep strain ε and creep time t based on Equation 1, denoted as Equation 2; and obtaining the creep fracture time t based on Equation 2. r The calculation formula is given; considering the influence of grain size, the corrected creep rupture time t is obtained. r Using the strain at 90% of the fracture life as the creep ductility-modified ductility exhaustion method, the creep strain ε is obtained. 0.9 The relationship between and ; according to t r ′、ε 0.9 The expression is used to obtain the creep life calculation formula. The high-temperature creep life prediction method of this invention considers the effects of different creep mechanisms, size effects, and plastic deformation during creep fracture, and can accurately predict the life of materials under high-temperature creep.

A safety break valve double-station radial fracture test system for petrochemical engineering is characterized in that a high-frequency high-pressure pulse air cannon moving between the upper ends of a right-end support assembly and a left-end support assembly is arranged in the middle of the upper end of a bottom frame, and the left-end support assembly is connected with a supercharging device; a shooting port of the high-resolution image measurement and simulation optimization analysis system moves between the upper ends of the right-end support assembly and the left-end support assembly, and a tested safety snap valve is arranged between the upper ends of the right-end support assembly and the left-end support assembly. The device has the main advantages that high-precision and high-resolution full strain or instantaneous deformation fracture measurement is realized, accurate and effective simulation measurement is effectively carried out on the process that the safety break valve is subjected to instantaneous shearing and fracture in the sudden dragging process, the automation degree is high, the measurement and analysis precision is high, the detection time efficiency and accuracy are improved, the detection cost is reduced, and the detection efficiency is improved. And product safety and quality improvement are facilitated.

The utility model discloses a high-temperature high-pressure rock mechanical fracturing test device which comprises a base, a confining pressure structure is arranged on the base, the confining pressure structure comprises a sample bearing table, a steel sleeve and an annular cover body, the sample bearing table is cylindrical and fixedly installed on the base, a lower end opening of the steel sleeve is installed on the sample bearing table in a sleeved mode, and the annular cover body is fixedly installed on the steel sleeve. At least two first sealing structures are arranged between the annular cover body and the sample bearing table, and the annular cover body is fixedly mounted at an upper port of the steel sleeve; a pressing rod capable of moving up and down is arranged in the steel sleeve, the pressing rod penetrates through the annular cover body, at least two second sealing structures are arranged between the pressing rod and the annular cover body, the top of the pressing rod is connected with normal loading equipment, a liquid injection hole is formed in the side wall of the steel sleeve, the liquid injection hole is connected with hydraulic loading equipment, and the outer wall of the steel sleeve is wrapped with a flexible detachable heating sleeve. The mechanical property of the rock under the multi-field coupling effect is analyzed and researched in an auxiliary mode, and the method has important practical significance for preventing accidents and guaranteeing engineering safety development.

The invention provides a method and a system for predicting dynamic load induced by buckling fracture of mining cantilever rock mass, and belongs to the technical field of cantilever rock mass dynamic load prediction. The method comprises the following steps: carrying out a buckling fracture test on a mining-induced non-uniform load-bearing cantilever rock mass to obtain elastic deformation energy of the cantilever rock mass when the cantilever rock mass is fractured under different load gradients; performing three-dimensional scanning on the fracture interface after the cantilever rock mass is fractured by using a three-dimensional scanning technology, and calculating the curvature of the fracture interface; establishing a function relationship between the section curvature and the elastic deformation energy according to different section curvatures and the corresponding fracture elastic deformation energy; on the basis of the function relation, the fracture elastic deformation energy is equivalent to a pair of power couples acting on the fixed end of the cantilever, and a calculation formula of the fracture dynamic load strength of the cantilever rock mass under different curvature conditions is deduced; and according to the calculation formula, the dynamic load strength generated by cantilever rock mass fracture is obtained by combining fracture curvatures corresponding to different load gradients. According to the scheme, the real dynamic response of rock mass fracture in the mining environment can be accurately reflected.

The present application provides a kind of rail fracture test method, comprising the following steps: step one: through the vibration sensor of vehicle running part axle box end, collect the vibration displacement of vehicle running part to steel rail;Step two: vibration sensor converts the collected mechanical vibration displacement into electrical signal, and is transmitted to the signal acquisition instrument of test equipment;Step three: signal processing unit is calculated and deduced to the deflection deformation of steel rail by formula through mechanics principle;Step four: the bending stiffness of the section steel rail is calculated by formula;Step five: test equipment is further calculated according to the collected deflection displacement data and bending stiffness data of steel rail The vertical vibration displacement and change rate of steel rail are calculated by formula;Step six: test equipment will automatically complete the detection, analysis and judgment of steel rail according to the obtained data;Solve the problem that user needs to manually operate and identify when testing by traditional flaw detection vehicle, without special arrangement of skylight time for testing, improve the efficiency of testing.