151 results about "Fracture process" patented technology

The invention relates to the technical field of data acquisition and data analysis, in particular to a hydraulic fracturing test crack propagation monitoring system which comprises a monitoring system and is used for monitoring crack propagation behaviors in the hydraulic fracturing process in real time. Constant or dynamically changing confining pressure and axial pressure are provided; the pore pressure dynamic regulation and control unit is used for accurately controlling the injection pressure, flow and saturation of fracturing fluid and simulating fracture propagation behaviors under different seepage conditions; the multi-physics field sensing monitoring network unit is used for collecting strain, sound wave signals and a surface displacement field in the crack expansion process in real time; full-scale monitoring of rock fracture propagation is realized, an influence mechanism of pore pressure and time effect on fracture evolution is disclosed, an accurate prediction means is provided for shale gas development and deep engineering, and the fracturing effect and engineering safety are remarkably improved.

The invention relates to the technical field of rock mechanics and petroleum and natural gas engineering, and particularly discloses a hydraulic fracture fracturing monitoring system, method and device based on optical fiber monitoring, and the system comprises a hydraulic fracturing simulation platform which is used for applying three-dimensional stress to a hydraulic fracturing test piece so as to simulate a stratum stress environment; the fracturing fluid injection device is used for injecting pre-prepared fracturing fluid into the test piece, so that a crack in the test piece expands; a plurality of strain sensor groups embedded in the test piece in the preparation process of the test piece; the optical fiber sensing demodulation device is used for collecting strain data detected by the plurality of strain sensor groups; and the data processing device is in communication connection with the optical fiber sensing demodulation device and is used for acquiring the strain data and processing the strain data so as to determine real-time state data of crack expansion in the test piece. According to the scheme, the fracture strain can be monitored in real time, and the accuracy and controllability of the hydraulic fracturing process are improved.

The invention provides a hydraulic fracturing fracture net distribution form near-field monitoring method, which comprises the following steps of: arranging a plurality of roof monitoring holes in roadways on two sides of an underground coal mine working surface, installing electromagnetic signal sensors in each roof monitoring hole and on anchor rods of roadway stoping sides, and constructing a full-space monitoring network covering a hydraulic fracturing layer; a data interpretation processing module of the electromagnetic signal time-shifting imaging analysis system comprises a multi-field coupling mathematical model for analyzing and deducing real-time imaging of electromagnetic signals; in the hydraulic fracturing process, an electromagnetic signal sensor is used for monitoring a current field, an electromagnetic field and an ion diffusion field in the rock mass fracture development and expansion process, a monitoring result is substituted into an electromagnetic signal time-shifting imaging analysis system for calculation and feature value extraction, and the fracture net distribution form is deduced through the feature value. According to the invention, the expansion path of the fracturing fluid in the rock stratum can be monitored in real time, the three-dimensional distribution form of the hydraulic fracturing fracture network can be inverted, and a new technical support is provided for the inspection of the hydraulic fracturing pressure relief effect of the underground coal mine.

A method for controlling a fracture height in unconventional oil and gas reservoirs under multi-bedding interference is provided. The method includes: obtaining geological parameters of a target horizontal well, and determining a fracturing fluid and construction parameters based on a production capacity target of the target horizontal well; determining a hydraulic fracturing process of the target horizontal well based on a hydraulic fracturing model for processing the multi-bedding interference, and evaluating the fracture height; comparing the fracture height with an expected control height, if the fracture height is greater than the expected control height, reducing a displacement of the fracturing fluid or a total time of a hydraulic fracturing to update the construction parameters until the fracture height is less than the expected control height; and performing the hydraulic fracturing on the target horizontal well based on updated construction parameters.

The invention discloses a fracturing crack long and short axis difference expansion evaluation and control method which comprises the steps that working parameters and a fracturing technology of a fracturing area are obtained, and the working parameters comprise engineering parameters and geological parameters; establishing a physical model of the fracturing position according to the working parameters and the fracturing process, and establishing a numerical simulation model for the difference extension of the long axis and the short axis of the fracture based on the physical model; performing numerical simulation on the working parameters of the fracturing area through the numerical simulation model, analyzing the influence of each parameter on the crack long-short axis difference expansion behavior difference and size according to a numerical simulation result, and establishing a crack long-short axis difference expansion prediction model according to the influence; and according to the extension prediction model, predicting fracturing fracture long and short axis difference extension, and according to a prediction result, adjusting a fracturing process to realize fracturing fracture long and short axis difference extension control.

The invention discloses a numerical simulation method, device and equipment for ice rock collapse starting and a medium, relates to the technical field of fluid motion simulation, and provides an FDEM-SPH coupling framework. Through a CIE unit in the FDEM method, crack propagation and fracture processes in rock masses are accurately simulated, and after the CIE unit is completely fractured, the FDEM method simultaneously simulates various contact forms between two separated finite units, so that mutual movement and interaction between fractured rock masses can be accurately described; ice and snow melting and movement in the ice-water phase change process are simulated through the smoothed particle flow SPH, and meanwhile, the interaction between ice-water phase change and rock mass fracture movement can be quantified by calculating the contact force between virtual particles in the smoothed particle flow SPH and the surface of a finite element in the finite discrete element method FDEM; the interaction reflects the erosion and impact of the ice-water phase change on the rock mass in the whole process and the actual physical condition in the ice rock collapse starting process, so that the ice rock collapse change more fitting the real condition is described.

The invention relates to the field of textured low-temperature co-fired ceramic materials, in particular to a textured low-temperature co-fired ceramic material and a preparation method thereof. According to the invention, a part of Al2O3 powder is replaced by flaky alpha-Al2O3, and the flaky alpha-Al2O3 is directionally arranged in the green tape along the tape casting direction through tape casting, so that the arrangement mode can play a role in increasing crack deflection and bridging in the fracture process of the textured low-temperature co-fired ceramic material; the bending strength of the textured low-temperature co-fired ceramic material is improved, and therefore the technical problem that an existing textured low-temperature co-fired ceramic material is poor in mechanical property is solved.

The invention relates to the field of electric power installation equipment, in particular to an electric power line phase-to-phase spacer fracture early warning induction device, and solves the problems of low efficiency, time delay and occupation of extra manpower of a traditional inspection means in the prior art. A signal is sent out through the inevitably accompanying physical deformation of a strain sensing optical fiber in the fracture process of the spacer to carry out judgment and early warning, real-time monitoring is achieved, and the labor cost is reduced. The spacer comprises a core rod, wire clamps are arranged at the left end and the right end of the core rod, and a hollow cavity is formed in the core rod in the axis direction; a hollow cavity is formed in the core rod, a spirally distributed strain sensing optical fiber is arranged in the hollow cavity, the strain sensing optical fiber is used for sensing the stress change of the core rod, and one end of the strain sensing optical fiber extends out of the hollow cavity and is connected with a fiber bragg grating demodulator.

The invention discloses a method for predicting the service behavior of an oil and gas pipeline under a stress corrosion cracking condition, and belongs to the field of material performance analysis and prediction. Firstly, based on a convection diffusion equation, a real stress intensity factor of an oil and gas pipeline crack tip is used as an unknown quantity to obtain a stress distribution condition; then, applying boundary conditions and a crack propagation criterion in fracture mechanics, and performing preliminary calculation to obtain crack propagation behavior characteristics of the one-dimensional semi-analytical model; and finally, calibrating and calculating the diffusion coefficient of the material parameter in the one-dimensional semi-analytical model to obtain real full-life service time information of the oil and gas pipeline material. According to the method, the full-life behavior information of stress corrosion cracking can be quickly obtained, and a partial differential equation does not need to be solved; on the basis of fracture mechanics, the mechanism of repeated fracture and reconstruction of the passivation layer in the fracture process can be reproduced; the full-life service time of the oil and gas pipeline can be effectively predicted, and the parameter calibration method can be applied to other conditions and is wide in application range.

The invention discloses a near-field dynamics simulation method for low-speed impact fracture of ultra-high performance concrete, which comprises the following steps: establishing a completely discrete model of a UHPC component, and realizing coupling of a concrete gel matrix and steel fibers through an Embedded method; a transition unit is introduced, a classic finite element unit and a PeriFEM local unit are connected through keys, force on the keys is modified, and coupling of the two methods is achieved; a continuous local unit is introduced, a motion equation of the local unit is deduced by adopting an explicit central difference algorithm, and an explicit algorithm based on the continuous local unit is constructed and used for solving the motion equation and calculating the damage condition of the UHPC matrix. According to the simulation method provided by the invention, the fracture process of the UHPC under low-speed impact can be effectively simulated, and a new solution of near-field dynamics and finite element coupling is provided.

The invention discloses a fracturing fluid viscosity dynamic regulation and control device and method for a true triaxial hydraulic fracturing experiment, and the method comprises the following steps: (1) starting and detecting whether a true triaxial hydraulic fracturing experiment system operates normally, verifying the accuracy and rationality of a Smith time delay compensation algorithm and adaptive PID control, and applying in-situ stress to a fracturing sample; (2) setting an initial viscosity value, injecting fracturing fluid into the fracturing sample at a constant flow, and synchronously starting an acoustic emission and resistivity signal receiver; (3) the fracturing effect is evaluated according to implementation feedback information such as acoustic emission / resistivity signals and fracturing pressure in the fracturing process, and the fluid mixing proportion is updated to track a new viscosity set value containing time delay compensation; (4) repeating the step (3) until a relatively complex hydraulic fracture structure is formed or the fracture thoroughly penetrates through the fracturing sample; and (5) based on different viscosity change paths set in the step (3), quantitatively analyzing the inhibition or promotion effect of viscosity change on fracture expansion, turning and branches, and realizing the maximization of the fracture network volume of hydraulic fracturing. A double-cylinder injection system capable of adjusting the fluid mixing proportion in real time is introduced, the limitation of traditional static mixing of the fracturing fluid is broken through in combination with a Smith time delay compensation algorithm and self-adaptive PID control, and the complex influence mechanism of dynamic viscosity change of the fracturing fluid on crack propagation and propping agent migration is explored; and the simulation capability and the research depth of the experiment are improved.

The invention discloses a method for evaluating a fracturing transformation effect through combination of forward modeling and inversion, and the method comprises the following steps: building a single-well fine fracturing model based on the heterogeneity and mechanical difference along a well section according to logging and indoor experiment data; a real fracturing process is simulated according to an actual pump injection program, and a fracture height parameter is obtained through forward modeling; calculating the liquid efficiency and the filtration coefficient of the fractured section through a fracture parameter inversion model according to the fracture height parameter in combination with the pumping stop pressure drop data; based on the process, a boundary element method is used for simulating the fracturing process, fracture length and fracture width parameters are obtained, and the fracturing transformation volume is determined by calculating stress field distribution around the fracture. According to the method for evaluating the fracturing transformation effect through combination of forward modeling and inversion, comprehensive, accurate and real-time evaluation of the fracturing transformation effect is achieved, a scientific basis is provided for optimizing fracturing construction parameters, improving the yield of an oil and gas well and reducing the development cost, and a reference is provided for subsequent fracturing design and construction adjustment.

The invention provides a dynamic load-oriented brazed diamond bonding strength testing device and method. The dynamic load-oriented brazed diamond bonding strength testing device comprises a base, a test framework, a self-adaptive sample holding unit, a data acquisition unit and a visual auxiliary alignment unit, the self-adaptive sample holding unit realizes stable clamping and angle adjustment of a sample through a rotatable platform, a translation bottom table, a hydraulic clamping cylinder and an angle adjusting piece; the data acquisition unit acquires a shear force-displacement curve by using a fiber bragg grating sensor, and a high-speed camera records a fracture process; and the vision-assisted alignment unit (high-resolution industrial camera) is used for calibrating the positions of the sample and the pressure head. The method comprises the steps of intelligent pre-characterization clamping, variable load dynamic shear testing, in-situ fracture mode judgment, multi-mode effective fracture area measurement and multi-dimensional strength characterization. According to the invention, the sample positioning and clamping stability is improved, the loading interference is reduced, the interface bonding strength is quantitatively and reliably represented under the dynamic load, and the test accuracy and repeatability are guaranteed.

The invention discloses a thermoplastic elastomer dynamic fatigue performance testing device and method, and belongs to the technical field of elastomer material testing, the thermoplastic elastomer dynamic fatigue performance testing device comprises a test rack, a transparent partition plate is installed outside the test rack in a combined mode, and the transparent partition plate seals the test rack to form a test sealing bin; the loading units are symmetrically distributed on the test rack left and right and located in the test sealing bin, and an elastic material is connected between the two loading units; the temperature sensor is mounted on the inner wall of the transparent partition plate; the control mechanism is horizontally fixed in the experiment sealing bin of the test rack; the loading unit is mainly used for providing dynamic tensile stress for the elastic material, the industrial camera records the whole fatigue fracture process, and the steel knife mechanism can perform notch preforming on the surface of the elastic material through the steel knife seat, so that fatigue damage is formed at a single point or multiple points in the middle of the elastic material; therefore, the time required by the whole fatigue fracture process is obviously shortened, and the test efficiency is improved.

The invention discloses a sleeve deformation simulation experiment system in a deep coal bed gas fracturing process. The sleeve deformation simulation experiment system comprises a test sleeve, a strong-plasticity deep coal rock sample, a sleeve deformation visual monitoring module, a target horizon deformation and crack propagation monitoring module, a fracturing fracture network global monitoring module, a liquid injection module and a ground stress loading module. The sleeve deformation visual monitoring module is used for monitoring the deformation damage condition of the test sleeve; the target horizon deformation and crack propagation monitoring module is used for monitoring surface deformation and crack propagation conditions of the sample; and the fracture network global monitoring module is used for monitoring the fracture expansion scale. According to the system, multi-load application of casing deformation can be achieved, the strong plasticity characteristic of deep coal bed gas is simulated, the fracture expansion scale and the casing deformation amount in the hydraulic fracturing process are accurately monitored, and risk level prediction of the influence of the hydraulic fracture expansion rule on casing deformation is achieved. The invention further discloses a sleeve deformation simulation experiment method in the deep coal bed gas fracturing process.

The invention relates to the technical field of rock mass mechanical analysis, and discloses a shale bedding mechanical property inversion method, equipment and a medium. The method comprises the following steps: acquiring a mechanical signal and a generated electric signal when a target shale is fractured under external applied force; dividing the shale fracture process into a plurality of time intervals according to a plurality of characteristic events in the electric signals and a bedding geometric model of the shale, and enabling each time interval to correspond to an expansion stage of a shale crack in one bedding interval; according to the equivalent path length of the crack in each bedding interval and the time difference between the adjacent characteristic events, determining the expansion speed of the crack in each bedding interval; according to the mechanical signals and a bedding geometric model, determining the stress intensity of each bedding interval of the shale in the fracture process; according to the stress intensity and the expansion speed, the equivalent fracture energy and fracture toughness of each bedding section of the shale in the fracture process are determined through the energy balance relation of the bedding sections in the fracture process, and therefore the shale bedding mechanical properties are inverted.

The application discloses a kind of coal rock nonlinear fracture propagation length quantitative determination method based on multiple parameters, comprising: preparation of coal rock sample containing notch;Spray black and white speckle on the surface of sample, install acoustic emission sensor, clip type extensometer and displacement sensor;Carry out three-point bending peak after cycle loading and unloading fracture experiment, record load, crack opening, force point displacement, acoustic emission waveform and DIC image;Through COD-P and LPD-P curve calculation mechanics flexibility, back calculation to solve stress constraint crack length;From acoustic emission positioning, obtain the spatial distribution histogram of breakage dissipation energy, combined with DIC horizontal displacement gradient threshold cloud picture, determine equivalent crack tip and length;Further calculate coal rock fracture process zone length, and intuitively show nonlinear fracture propagation path.The application provides a kind of crack dynamic change quantitative determination method based on mechanics flexibility-displacement gradient-energy dissipation distribution multiple physical parameters, reduce the influence of human subjective consciousness, and the measurement result is accurate and reliable.

The invention relates to two-way integrated hydraulic fracturing equipment and a using method, and belongs to the technical field of coal mine roof cutting. The system comprises a first drill rod, a second drill rod, sealing devices and a kerf fracturing device, the first drill rod and the second drill rod are hollow rods, one end of the first drill rod and one end of the second drill rod are connected through the kerf fracturing device, and the sealing devices are arranged at the other end of the first drill rod and the other end of the second drill rod respectively; the sealing devices adopt hole packers, the two hole packers are connected through a sealing pipeline, and the sealing pipeline sequentially penetrates through the first drill rod, the kerf fracturing device and the second drill rod. The problems that in the prior art, drill hole joint cutting is discontinuous, joint cutting and fracturing procedures are separated, and a hole sealing area is inaccurate are solved, the overall hydraulic fracturing effect of drill holes is improved, the failure rate in the equipment operation process is reduced, and the effects of sequential joint cutting and segmented fracturing in the drill holes are achieved.

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 discloses an abrasive water jet rock breaking simulation method based on a DEM-CFD coupling method. Establishing an EBPM bonded rock mass discrete element model through a discrete element DEM, and calibrating mesoscopic parameters through a virtual mechanical test; simulating a water-abrasive two-phase flow through fluid dynamics CFD, and adopting a Gidaspow drag force model; the DEM-CFD bidirectional interface realizes real-time coupling; carrying out post-treatment to extract an erosion morphology and a crack network; the method can effectively simulate the rock mass fracture process and the large deformation behavior in the water jet rock breaking process and reveal rock mass damage evolution from the microscopic scale, and can be widely applied to research of water jet assisted rock breaking in the fields of civil engineering, mining, petroleum energy, marine resources and the like.

The invention provides a natural fracture acid fracturing process parameter optimization method and device, equipment and a medium, and the optimization method comprises the steps: obtaining geological and engineering data of a target block, carrying out the fitting of the geological and engineering data to obtain a natural fracture fitting model, determining the natural fracture fitting parameters according to the natural fracture fitting model, and carrying out the acid fracturing process parameter optimization of the target block. Further establishing a pressure drop characteristic parameter model and a natural fracture characteristic parameter model by using actually measured pressure data, and further establishing a productivity prediction model; and according to the productivity prediction model and the natural fracture fitting model, optimizing the acid fracturing process parameters of the natural fractures. According to the method, the condition of natural fractures encountered by underground hydraulic fractures is innovatively and dynamically judged according to the wellhead pressure change rule in the multi-stage alternate acid fracturing process, parameters can be dynamically adjusted on this basis to achieve dynamic optimization of a pump injection program, and a basis is provided for whether the natural fractures are transformed or not in real time in the construction process; and a new thought and a new method are provided for acid fracturing parameter design and optimization.

The application provides a compact dolomite reservoir composite acid fracturing process parameter evaluation system and method, which comprises a simulated fracture device, an acid injection device and a circulating water injection device. The acid injection device comprises an acid storage container, an acid injection pipeline and an acid discharge pipeline. The acid injection pipeline is connected to the acid storage container and the acid injection liquid inlet hole of the simulated fracture device at both ends. The acid discharge pipeline is connected to the acid injection liquid outlet hole of the simulated fracture device. The circulating water injection device comprises a water storage container, a water inlet pipeline and a circulating water discharge pipeline. The water inlet pipeline is connected to the water storage container and the water injection liquid inlet hole of the simulated fracture device at both ends. The circulating water discharge pipeline is connected to the water injection liquid outlet hole of the simulated fracture device and the water storage container at both ends. The application adopts reverse thinking to evaluate the composite acid fracturing process parameters such as the preflush / acid viscosity ratio, the pump injection displacement and the alternating series by taking the fractal dimension, the acid volume, the flow conductivity and the acid fluid loss as the targets, and is more specific and systematic.

The invention provides a multiphase dielectric material microstructure three-dimensional fracture whole process simulation method based on space-time sequence prediction. The method comprises the following steps: S1, acquiring sample data; s2, constructing and training a deep learning model network; and S3, model verification: inputting historical surface crack information of the composite material into the trained generative network to obtain a subsequent fracture damage process of the composite material, applying Wasserstein distance quantification, comparing forms between fracture surfaces, and judging whether the performance of the model is good or bad. According to the method, the fracture surface in the entity can be predicted according to the historical apparent cracks of the composite material under the condition that component distribution information of the composite material is not needed; a network model is trained completely from the perspective of observation data, and it can be theoretically achieved that a prediction result is almost consistent with a result observed in an experiment; the calculation efficiency is high, and the calculation duration can be shortened from weeks to seconds; pixel-level modeling can be realized; the fracture process in the material can be predicted according to the apparent cracks of the material.

The invention relates to the technical field of material mechanical property research, in particular to an improved Minami parameter calibration method. According to the method, a complete calibration process is formed through systematic finite element modeling, fracture process zone analysis and parameter iteration fitting, the dependence of a traditional Minami method on test data is remarkably reduced, the parameter calibration efficiency and accuracy are improved, and the method is suitable for cleavage fracture analysis of various materials.

This invention belongs to the field of fracture characterization and reservoir hydraulic fracturing simulation technology. It discloses a method and related equipment for characterizing natural fractures and simulating reservoir damage evolution using a phase-field model. By distinguishing primary and secondary natural fractures based on a discrete fracture network and constructing a model, it achieves accurate characterization of the different sizes and spatial heterogeneity of primary / secondary natural fractures in the model. Natural fractures are characterized as mechanically weak surfaces with differentiated parameters. Hydraulic fractures can capture and interact with natural fractures. Combining a phase-field damage model and a rock mechanics constitutive model, it can accurately simulate key behaviors such as activation and deflection during natural fracture propagation without pre-setting fracture paths, avoiding numerical instability and low computational efficiency. Through dynamic coupling analysis of the entire fluid-solid-damage process, it takes into account the influence of multiple factors such as geostress and fluid pressure, improving the accuracy of phase-field simulation, reducing simulation distortion, providing reliable support for fracturing design optimization, helping to improve reservoir stimulation effects and production benefits, and ensuring the smooth implementation of fracturing processes.

This invention relates to the field of connecting rod processing technology, specifically to a fracture device and method for connecting rods in large machinery. The device includes a laser marking machine worktable, a fracture device worktable, and a connecting rod. A laser marking machine and a laser marking feeder are mounted on the upper end of the laser marking machine worktable. A fracture device is mounted on the upper end of the fracture device worktable. The laser marking feeder and the fracture device are used for positioning the connecting rod. The laser marking feeder includes a small-end positioning pin and a large-end positioning pin. The small-end positioning pin is used for positioning the small end of the connecting rod, and the large-end positioning pin is used for positioning the large end of the connecting rod. The fracture device includes a small-end positioning component and a fracture block. The small-end positioning component is used for positioning the small end of the connecting rod, and the fracture block is used for limiting the fracture of the large end of the connecting rod. Compared to existing sawing processes for connecting rods in large machinery, the laser marking fracture process of this invention simplifies the processing flow and improves the performance of the connecting rod.

The application provides a kind of transmission wire ice ridge radial fracture strength testing device and method, it is related to transmission line icing test technical field.The application is through integration ice ridge growth module, ice ridge clamping mechanism and thrust exertion and detection system, constitutes a closed technical scheme for ice ridge test.The application first drops water to transmission wire under low temperature environment, to simulate the natural growth forming process of ice ridge, so that the test is closer to real working condition;Ice ridge clamping mechanism clamps ice ridge by jaw assembly;Thrust exertion and detection system exerts controllable thrust to jaw assembly and records the thrust value of ice ridge in real time, ensures the accurate collection of thrust data, realizes the quantitative evaluation of mechanical properties in the fracture process of ice ridge.

The invention discloses an intelligent fracturing system and method. The system comprises a carrying platform, a navigation device I, a fracturing device, a sensing device, an intelligent control system, a navigation device II, a moving device, a working arm and a pipeline switch controller. The method comprises the following steps: 1) arranging a drill hole in a top plate of a to-be-worked area, and placing a fracturing system; (2) a path is autonomously planned through an intelligent control system and a navigation device II, and a moving device is controlled to move to the position near the area to be fractured; (3) the intelligent control system controls the working arm to move to a to-be-fractured area, fracturing is conducted through a fracturing device, and cracks are generated; (4) real-time data in the fracturing process are monitored through a sensing device, and after the fracture state is stable, the intelligent control system controls the working arm to retract back to the carrying platform; and 5) returning to the step 2) until all fracturing operations in the to-be-worked area are completed. The fracturing precision and the resource utilization rate are remarkably improved, and an intrinsically safe, green and efficient intelligent solution is provided for safe and efficient mining of deep coal.

The invention relates to a phase change clay fracture performance and failure characteristic test device, a prefabricated crack soil beam test piece, a servo motor, a sensor and a camera unit are arranged on a three-point / four-point bending moment loading frame, and the servo motor and the sensor are connected with a data acquisition unit. The invention also relates to a phase change clay fracture performance and failure characteristic test method. According to the invention, the compressive fracture process of the phase-change clay can be truly simulated, the fracture performance and damage characteristics of the phase-change clay in various complex fracture modes (including I-type, II-type and I-II-type fracture modes) can be accurately and reliably measured, and a premise can be provided for research of the fracture characteristics of the phase-change clay and analysis of core wall fracture damage and hydraulic fracture problems.

The invention discloses a hydrogen-induced cracking molecular dynamics-cohesion cross-scale simulation method which comprises the following steps: constructing a geometric model reflecting an actual material microstructure on the basis of multi-scale structure characteristics such as grain size, grain boundary angle and the like obtained by metallographic observation and electron back scattering diffraction test; simulating a fracture process of a microscopic interface under different hydrogen concentrations through a molecular dynamics method, obtaining traction-separation data, and calibrating core parameters of the cohesion model; embedding the parameters into a polycrystalline finite element model constructed based on a Thiessen polygon to realize parameter transmission and coupling calculation from a micro scale to a micro scale; the cohesion unit accurately describes hydrogen-induced grain boundary damage and crack propagation behaviors. According to the method, through multi-scale correlation modeling and direct parameter calibration, the reliability and prediction precision of the model are remarkably improved, and a theoretical basis and an engineering applicable tool are provided for hydrogen embrittlement resistance design and service life evaluation of a hydrogen equipment material.