245 results about "Crustal stress" patented technology

The invention relates to the technical field of crustal stress field data processing, in particular to a crustal stress field three-dimensional dynamic inversion method based on a multi-scale adaptive algorithm. The method comprises the following steps: acquiring a geological data set of a target area; constructing a crustal stress field three-dimensional initial model based on the geological data set, and performing geologic body space division and mesh generation to obtain crustal stress field three-dimensional mesh model data; performing multi-scale region division on the crustal stress field three-dimensional grid model data, and establishing a multi-scale weighting function to obtain multi-scale partition mapping information; and constructing a cross-scale boundary adaptive transmission mechanism, and establishing a stress tensor continuity constraint model at a multi-scale partition boundary to obtain cross-scale stress boundary coupling data. Through a multi-scale adaptive algorithm and dynamic closed-loop optimization, high-precision, dynamic and continuous inversion of a crustal stress field in a complex geologic structure is realized.

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 embodiment of the invention provides a blast hole layout method based on crack propagation characteristics under a coupling model, and relates to the field of blast hole position calculation and data processing. The method comprises the following steps: acquiring crustal stress data and rock mechanics data; coupling a stress field model by utilizing the explosion load, the crustal stress data and the rock mechanics data; acquiring blasting data under the stress of the infinitesimal point by utilizing the stress field model, wherein the blasting data comprises the radius of a crushing area and the radius of a fracture area of the rock; based on the blasting data, utilizing MATLAB to predict a crack propagation path under the stress of the infinitesimal point; and obtaining an optimized blast hole arrangement diagram by utilizing the crack propagation path. According to the scheme provided by the invention, the blasting effect can be predicted more accurately by accurately calculating, simulating and optimizing the blast hole arrangement diagram, so that unnecessary blast holes are reduced, and the efficiency of blasting operation is improved. The blast hole layout method based on the crack propagation characteristic can better control the damage range of the rock, the problem of excessive damage is avoided, and the stability of the rock around the tunnel is protected.

The invention discloses a tight reservoir three-dimensional crustal stress field modeling method based on an improved neural network. The tight reservoir three-dimensional crustal stress field modeling method comprises the steps that S1, a unified-format multi-source geological physical data tensor set is constructed; s2, constructing a frequency domain hierarchical enhancement-SIREN implicit neural network structure based on the unified format multi-source geological physical data tensor set; s3, inputting the candidate hyper-parameter configuration into the frequency domain hierarchical enhancement-SIREN implicit neural network to complete one-time model training; s4, aiming at each candidate hyper-parameter configuration, initializing an inner-layer population of the black widow optimization algorithm, completing second model training, and obtaining an optimal model parameter of the frequency domain hierarchical enhancement-SIREN implicit neural network; s5, tight reservoir fracturing parameter optimization and real-time safety window adjustment are achieved. According to the method, the continuous stress field can be quickly generated at the resolution of 1 m, real-time well section updating and fracturing scheme optimization are supported, and the fracturing transformation effect, the fracturing safety margin and the reliability of economic productivity prediction are remarkably improved in practical application.

The invention provides a deep-buried soft rock tunnel supporting structure design method based on energy regulation and control, and belongs to the technical field of tunnel engineering. Comprising the following steps: obtaining components of crustal stress in a large principal stress direction, a middle principal stress direction and a small principal stress direction; manufacturing a rock cylinder test piece and a cube test piece; carrying out a conventional uniaxial compression test on the cylindrical test piece to obtain basic strength parameters of the surrounding rock; carrying out a true triaxial loading and unloading test on the cubic test piece to obtain the ultimate dissipated energy of the surrounding rock; drawing up a tunnel anchor rod supporting structure design scheme; establishing a deep-buried soft rock tunnel calculation model considering the synergistic effect of the surrounding rock and the anchor rod, and calculating the dissipated energy density of the surrounding rock and the absorbed energy of the supporting structure; the instability energy judgment basis of the surrounding rock and the instability energy judgment basis of the anchor rod are calculated; and judging the stability of the surrounding rock and the stability of the anchor rod. The method is suitable for the tunnel in a deep high-energy geological environment, and can reflect the energy driving essence of the instability failure of the high-ground-stress deeply-buried soft rock tunnel.

The invention discloses a geological monitoring data processing method and system based on multiple neural networks, and relates to the technical field of geological monitoring data processing, and the method comprises the steps: employing a dynamic heterogeneous neural network fusion architecture, and carrying out the classification routing processing of various types of geological monitoring input data, obtaining a corresponding first local space feature, a second fault topological structure feature and a third time sequence feature vector; performing optimization training on the multi-task prediction network by using a joint loss function with geological physical constraints, the main task network being used for predicting an earth crust displacement field, and the auxiliary task network being used for predicting an earth crust stress field to obtain an optimized fusion model; based on the optimized fusion model, performing reasoning prediction on the new geological monitoring input data, and outputting a comprehensive geological risk assessment result; through the dynamic heterogeneous neural network fusion architecture, various geological monitoring input data are classified and routed, and the problem that multi-source heterogeneous geological data cannot be effectively processed through a traditional method is solved.

A design method for preventing and controlling water inrush catastrophe in tunnels and techniques for optimizing actual tunnel construction, specifically: discretizing calculation model into material points, setting virtual boundary layers outside boundary of calculation model; selecting size of horizon of material points to form neighborhood matrix of material points; making crustal stress equivalent to stress boundary condition, making karst cave water pressure equivalent to normal pressure, and converting displacement constraint and tunnel support into displacement boundary conditions; solving speed and displacement of material point, determining whether bonds of all material points meet failure condition, recording local damage situations; after initial balance calculation is stable, simulating tunnel construction process by using material point dormancy method; and according to physical values of optimization parameters of actual tunnel construction obtained by simulation results that meet the requirements of water inrush catastrophe prevention and control, implementing the optimized actual tunnel construction.

The invention discloses a mine deep well crustal stress real-time monitoring system and method, and relates to the technical field of mine deep well crustal stress monitoring, and the method specifically comprises the following steps: collecting crustal stress monitoring point data in each sub-block, and generating a regional stress distribution map based on the spatial relationship between monitoring points; based on the generated regional stress distribution map, evaluating whether the division mechanism of the current risk identification region adapts to the current crustal stress distribution state; dividing each sub-block into a first identification matching area, a second identification offset area and a third identification reconstruction area according to the evaluation result, and dynamically adjusting the division boundary of the risk identification area according to the classification result; and executing corresponding risk response measures based on the divided region types, and dynamically correcting the risk identification range based on a response result. According to the method, the problem of ground stress identification lag is solved, and the intelligent monitoring effect of risk area dynamic division and accurate regulation and control is achieved.

The invention provides an indoor crustal stress test device and method based on optical strain measurement, the test device comprises a stress simulation device, the stress simulation device can perform real three-dimensional crustal stress environment simulation on a test rock mass as far as possible; the drilling releasing device is provided with a hollow drill bit used for drilling the optical strain measurer installed in the test rock mass, and the drilling hole and the hollow drill bit are coaxially arranged. Thus, according to the method, pressure is applied to the test rock mass from multiple directions through the multiple hydraulic loading columns, the real three-dimensional crustal stress environment can be more accurately simulated, speckle image changes in the speckle coating can be continuously recorded in real time through the optical strain measurer, and hole wall strain data are obtained; and converting the strain data into stress by applying an elastic theoretical formula, and accurately calculating the stress state of the experimental rock mass.

The invention relates to the technical field of roadway supporting, in particular to a deep roadway surrounding rock grading and anchor rod supporting decision-making method and system, and the method comprises the steps: obtaining roadway data information; based on the crustal stress parameter, the rock stratum strength parameter, the underground water influence and the mining influence, the roadway surrounding rock stability level is obtained; and based on the roadway data information and roadway mine pressure appearance judgment, obtaining roadway basic support information according to the roadway surrounding rock stability level. According to the method, the roadway surrounding rock stability level is obtained, corresponding supporting forms and parameters are given according to supporting experience qualitative rating, deep roadway supporting quantitative division and qualitative rating are combined, and the graded supporting technology is more scientific. The problem that the deep roadway support parameter design is mainly based on engineering experience, and support parameters designed by engineering technicians with different experiences under the same engineering geological condition possibly have large differences is solved.

The invention discloses a hydraulic engineering safety risk evaluation method and system, and particularly relates to the technical field of hydraulic engineering. Whether abnormal stress concentration or release exists or not is judged by analyzing the change rate fluctuation condition of crustal stress along with time, if abnormity is detected, an array type earthquake monitoring sensor is adopted to analyze micro-earthquake characteristics and earthquake wave speed abnormity of a dam area, whether local rock mass structure change or hidden damage exists or not is judged, and a geological disaster interference evaluation model is constructed. Calculating an interference index by integrating a crustal stress fluctuation index and a seismic wave speed anomaly index, when the interference index reaches a high interference degree, immediately starting a dynamic adjustment mechanism by the system, remotely adjusting the sensitivity of monitoring equipment and the data acquisition frequency according to the interference condition, and automatically optimizing an early warning threshold value; interference of geological disasters on monitoring equipment can be effectively reduced, the accuracy of hydraulic engineering safety monitoring is improved, real-time early warning and intelligent regulation and control are achieved, and the dam safety management capacity is enhanced.

The invention relates to the technical field of earthquake prediction, in particular to a crustal stress azimuth earthquake prediction method based on a transverse wave speed change rate, which comprises the following steps: calculating a speed value of a transverse wave and a propagation distance, extracting a difference value to generate a change rate set, calculating an offset rate, screening a continuous overrun section, identifying a disturbance path section, and performing interpolation restoration to generate a purification sequence. Extracting forward and reverse propagation trends and counting direction identifiers, and generating a crustal stress main stress direction map; according to the method, a change rate set is generated through a sliding window segmentation speed sequence, data continuity is enhanced, local features are reserved, a sudden change area is screened and accurately positioned in combination with a continuous offset rate, multi-path lithology difference identification and disturbance repair are carried out, non-structural interference is eliminated, and forward and reverse path cross validation is carried out to screen a direction consistent section, so that the discrimination robustness is improved; the velocity direction is dynamically associated with the structure trend, synchronous analysis of the stress field and fault activity is realized, multi-stage processing is combined with dynamic threshold and direction verification, and the derivation precision and timeliness are improved.

The present disclosure relates to the technical field of stability control of surrounding rock of tunnelling, and provides an excavation compensation method for tunnelling in deep rock engineering, including: acquiring an engineering geological information of the tunnelling in deep rock engineering; determining an engineering hazard type based on the engineering geological information; determining an excavation compensation support strategy for the surrounding rock of the tunnelling in deep rock engineering based on the engineering hazard type; and performing a supplementary support control on the surrounding rock of the tunnelling in deep rock engineering based on the excavation compensation support strategy. Through the supplementary support strategy, the difference value between a radial stress of the surrounding rock of the tunnelling in deep rock engineering and an initial crustal stress can be reduced to within a preset approximate value range, further effectively preventing a stress concentration phenomenon occurred in a tangential stress.

The invention provides a hydraulic fracturing pilot test method, electronic equipment, a storage medium and a program product, and relates to the technical field of hydraulic fracturing test. The method comprises the following steps: determining a fractured well in a to-be-tested site and a plurality of test wells meeting a preset position relationship with the fractured well; determining the crustal stress state of the target test well; according to the crustal stress state and preset hydraulic fracturing process parameters, fracturing testing is conducted on the fractured well, and collected data of the detection equipment is obtained; based on the rock mass sectioning image of the preset position of the to-be-tested site, crack network characterization information is determined, and the crack network characterization information is used for indicating the shape of a crack formed by fracturing and the distribution condition of a propping agent; according to the collected data, the fracturing test process is inverted, and fracturing dynamic process information is obtained; and generating a hydraulic fracturing process optimization scheme according to a comparison result between the fracturing dynamic process information and the fracture network characterization information. According to the method, the accuracy and practicability of a hydraulic fracturing test result are improved.

The invention discloses a horizontal well fracturing perforation parameter optimization method and device considering non-uniform crustal stress and a medium, and relates to the field of unconventional oil and gas reservoir yield increase renovation. The method comprises the steps that a three-dimensional non-uniform crustal stress field of reservoir fracturing is constructed; the method comprises the following steps of: performing grid division on a hydraulic fracture by using a fracture unit, acting a three-dimensional non-uniform ground stress field on a divided grid, and establishing a constitutive model of reservoir rock deformation and stress in a hydraulic fracturing process; according to the constitutive model, establishing a flow model of the fracturing fluid in the horizontal shaft, the perforation hole and the hydraulic fracture; establishing an expansion criterion of the hydraulic fracture in the fracture length and fracture height directions; according to the expansion criterion and the flow model, the expansion results of the horizontal well fracturing cracks under different perforation parameters are simulated; and the horizontal well fracturing perforation parameters are optimized according to the expansion result. According to the method, the defects of a uniform crustal stress field assumption and a plane crack propagation assumption in the prior art are overcome, and the optimization of the horizontal well fracturing perforation parameters in the non-uniform crustal stress field is realized.

The embodiment of the invention provides a fracture source positioning method and system based on multi-information fusion, and can solve the problems that in dam or underground water tunnel construction, surrounding rock fracture may cause leakage or collapse, the engineering safety is affected, and the positioning precision and accuracy need to be improved. The method comprises the following steps: acquiring micro-seismic waveform data based on a sensor network arranged in a surrounding rock, and inverting position information of a fracture source according to the micro-seismic waveform data; calculating crustal stress distribution based on the initial crustal stress field of the surrounding rock in combination with a geologic model, and simulating a disturbance stress field according to an excavation scheme to identify a high stress concentration area; and performing fracture source positioning verification according to the position information, obtained by inversion, of the fracture source and the identified position relation of the high stress concentration area.

The invention belongs to the field of crustal stress measurement, and discloses a crustal stress measurement method based on an indentation technology and machine learning, which comprises the following steps: firstly drilling a rock core, and processing the rock core into a sample; performing a shallow indentation test to obtain an indentation load-displacement curve, and obtaining a rock core equivalent elastic model; carrying out a deep indentation test, and taking test data as an actual training sample of machine learning; inputting the actual training sample training set into a neural network for network training to obtain a ground stress inverse problem model; carrying out an in-situ indentation test, and calculating to obtain a minimum horizontal principal stress and a maximum horizontal principal stress according to the rock core equivalent elastic model; measuring a drilling well bottom indentation main crack direction by means of an imaging logging instrument, wherein the drilling well bottom indentation main crack direction is the maximum horizontal main stress direction; the earth deep rock crustal stress measurement method is constructed based on an indentation technology and machine learning; compared with an existing conventional rock mechanical property measurement technology, the indentation technology is convenient to operate, and in-situ testing can be carried out on mechanical behaviors of rocks in the deep part of the earth and in a large deformation area of soft rocks.

The invention provides a crustal stress prediction method and device, electronic equipment and a storage medium, and relates to the technical field of seismic survey. The method comprises the following steps: obtaining observation seismic data of seismic wavelets in a strong VTI medium, and constructing a to-be-inverted parameter matrix based on a PP wave reflection coefficient corresponding to the strong VTI medium; constructing a posterior probability function obeyed by an inversion parameter matrix corresponding to the to-be-inverted parameter matrix based on a Bayesian inversion theory and observation seismic data, and determining a target functional based on a prior probability function and a likelihood function corresponding to the posterior probability function; determining medium density and each stiffness matrix coefficient based on an inversion parameter matrix solving result of the target functional, and determining a flexibility matrix of the strong VTI medium based on each stiffness matrix coefficient; and predicting the ground stress distribution of the target profile in the strong VTI medium based on the medium density and the positive strain matrix and the flexibility matrix corresponding to the strong VTI. Therefore, the crustal stress prediction accuracy under the strong VTI medium is improved.

The invention discloses an overlapped goaf coal spontaneous combustion and gas symbiosis disaster identification and treatment method, which can accurately obtain an approximate range of a front goaf by combining geological data, a result detected by a transient electromagnetic detection device and a borehole observation instrument, and calculate the pore dimension and the average porosity of the area through a specific algorithm. Then, by taking the grouting hole as the center, a plurality of detection holes with different angles are formed, the directions of the detection holes are different to form a distribution form of continuously diffusing outwards in a spherical shape, and a comprehensive monitoring device is arranged at the final hole position of each detection hole, so that whether data of an underground gas concentration field, a temperature field, a gas pressure field, an air leakage flow field and a crustal stress field are abnormal or not is obtained; according to the method, redundant or complementary information of a plurality of monitoring devices at different positions in space or time is comprehensively and consistently explained or described on the whole goaf, so that the disaster condition can be identified and judged more accurately, and the construction safety in the whole tunneling or stoping process can be guaranteed.

The invention discloses a physical model test system of a gas storage structure capable of conveniently applying ground stress. The system comprises a gas storage chamber, the gas storage chamber comprises a sealing layer arranged in a cavity, and a longitudinal optical fiber sensor and an annular optical fiber sensor are pasted to the outer side of the sealing layer; a concrete lining layer is arranged on the periphery of the sealing layer, and a cylindrical steel bar pipe network is pre-embedded in the concrete lining layer; concrete surrounding rock is arranged on the periphery of the gas storage chamber, and a cubic reinforcing mesh used for applying ground stress is pre-buried in the concrete surrounding rock. The top end and the bottom end of the gas storage chamber communicate with a gas inlet pipeline and a gas outlet pipeline extending to the outer side of the concrete surrounding rock correspondingly. An air inlet of the air inlet pipeline is connected with an air compressor and a water pressure system, and the air compressor and the water pressure system are connected with the control system. According to the invention, the unused position change condition of each structural layer of the underground gas storage under the coupling action of internal force and external force can be reflected more truly.

The invention relates to the technical field of arc shaped energy-gathered blasting parameter design, and provides an arc shaped energy-gathered blasting parameter design method under a complex crustal stress condition, which comprises the following steps: establishing a double-hole blasting three-dimensional model comprising a rock mass, an arc explosive, an energy-gathered pipe and coupled air, applying a crustal stress boundary condition and carrying out stress initialization; setting material model parameters based on the test data; performing fluid-structure interaction dynamic response numerical simulation on the model by adopting LS-DYNA to obtain stress and strain response caused by blasting; and establishing evaluation indexes based on tensile stress, compressive stress and through crack formation, carrying out sensitivity analysis and optimization adjustment on key blasting parameters such as blast hole spacing, delayed detonation time, explosive loading amount and coupling coefficient, and finally determining an optimal blasting parameter combination in different stress states. The method can effectively meet the blasting operation requirement under the complex ground stress condition, the presplitting quality and the rock mass stability are remarkably improved, and the method has wide engineering application prospects.

The invention provides a soft rock roadway large deformation control method, and relates to the technical field of soft rock roadway supporting, and the method comprises the following steps: carrying out a crustal stress test, obtaining a crustal stress distribution rule of a roadway area, and analyzing the relationship between roadway arrangement and a crustal stress field, and the influence of crustal stress on roadway surrounding rock stress distribution; based on a ground stress test result, an anchor net cable, sprayed concrete, U-shaped shed and inverted arch active support system is constructed; according to the method, a series of stress tests and other studies are carried out, a series of relations between crustal stress distribution rules and a coal rock mass structure are obtained, an original passive supporting mode of anchor net and shed erecting is adjusted into active supporting of anchor net cable, concrete spraying, U-shaped shed and inverted arch, efficient cooperative control among different supporting measures is achieved, and the supporting effect is good. The supporting system and the supporting characteristic curve are adapted and matched with the deformation activity state of the surrounding rock, the self-bearing capacity of the surrounding rock and the supporting capacity of the supporting system are exerted to the maximum extent, and the purpose of maintaining the stability of a roadway is achieved.

The invention relates to the technical field of mining, and provides an early warning method and system for coal and gas outburst of a driving face based on stress monitoring. According to the method, distributed strain optical fibers are laid in a coal body in front of a tunneling working face through a staggered drilling field, continuous and real-time monitoring of the ground stress of the coal body is achieved by means of the Brillouin scattering effect of the optical fibers, and a series of problems of locality, large errors, discontinuity, large work amount, occupied operation time and space and the like of stress monitoring of the tunneling working face are solved; noise elimination is carried out through ensemble empirical mode decomposition, the quality of coal body crustal stress data is improved, the range of a coal body crustal stress concentration area is rapidly determined, and the internal stress peak value and the stress change rate of the stress concentration area are tracked and compared with critical values. The coal and gas outburst early warning method is suitable for coal and gas outburst prevention and control of the driving face of the coal and gas outburst mine.

The invention belongs to the technical field of oil development hydraulic fracturing, and discloses an artificial fracture flow conductivity evolution process prediction method considering a dynamic crustal stress field, and the method specifically comprises the following steps: constructing an oil reservoir geologic model; constructing an oil reservoir geomechanical model; carrying out a proppant long-term conductivity test experiment to obtain a proppant conductivity chart; and based on the constructed oil reservoir geologic model and the constructed geomechanical model, combining proppant flow conductivity chart data, and utilizing a fluid-solid coupling oil reservoir simulation technology to predict a reservoir stress field and a pore pressure field in the fracturing production process, so as to predict fracture flow conductivity in different production stages. According to the method, the fracture flow conductivity change under the production dynamic state can be more comprehensively represented, so that a support is provided for fracture flow conductivity optimization of a fractured well and proppant type selection.

The invention discloses an earthquake forecasting and tsunami early warning method and system, and the method comprises the steps: monitoring the earth electromagnetic field data in real time, and recognizing and extracting a regional transient electromagnetic signal which accords with a preset abnormal feature as an earthquake precursor signal; taking the position of the precursor signal as a reference, and predicting the earthquake generation time, the magnitude and the potential influence area based on an earth crust stress wave propagation model; when the early warning condition is met, earthquake early warning information containing risk avoiding guidance is generated and issued, and if the prediction area relates to the coastal area and the earthquake magnitude reaches a threshold value, tsunami early warning information is synchronously generated and issued. The corresponding system comprises a geomagnetic monitoring module, a forecast analysis module and an early warning issuing module. According to the method, pre-earthquake prediction based on the physical precursor is realized, the prediction time is remarkably prolonged, the problems that earthquake and tsunami early warning information is separated and published lags are solved, and the disaster response capability is improved.

The invention provides an underground chamber stability assessment method based on deep learning and fusion uncertainty, and relates to the technical field of underground chamber stability assessment, and the method specifically comprises the steps: constructing an instability assessment model, and employing crustal stress parameters and rock mechanics parameters collected historically as a training set, the stability coefficient of the underground chamber is used as a label, and the stability of the underground chamber can be analyzed more accurately through training of a deep learning model; besides, a function relationship of the influence of the rock parameters on the stability of the underground chamber is constructed, and multiple groups of current second influence coefficients are obtained by inputting multiple groups of current rock parameters into the function, so that the comprehensiveness and the accuracy of evaluation are improved; and finally, through data processing and correction, uncertainty factors are comprehensively considered, and the stability and reliability of an evaluation result are improved. The method can overcome the technical defects that constants are difficult to determine, parameter processing is incomplete, and evaluation results are unstable in a traditional method.

The invention discloses a complex formation well wall stability prediction method, system and equipment and a medium. The method comprises the following steps: acquiring actually measured formation data of a drilled reservoir section; calculating formation pore pressure and rock mechanical parameters according to actually measured formation data; calculating the crustal stress according to the formation pore pressure and the rock mechanical parameter profile; taking the additional density zero of the slurry as an initial value, taking the tectonic strain coefficient in the horizontal minimum principal stress direction and the tectonic strain coefficient in the horizontal maximum principal stress direction as initial tectonic strain coefficients, and obtaining the initial pore fluid pressure, the horizontal minimum principal stress and the horizontal maximum principal stress of the stratum on the basis of actually measured stratum data; the collapse pressure equivalent density and the fracture pressure equivalent density of the drilled well can be obtained according to the collapse pressure equivalent density calculation formula and the fracture pressure equivalent density calculation formula; and when the pressure corresponding to the drilling mud density is larger than the collapse pressure equivalent density and smaller than the fracture pressure equivalent density, the well wall is stable.

The invention discloses a method and system for determining the pressure relief drill hole spacing in a three-dimensional stress field, and relates to the field of drill hole spacing layer.The method comprises the steps that the roadway bearing pressure peak value range is obtained; acquiring corresponding crustal stress magnitude, crustal stress azimuth angle and inclination angle; the cohesion C, the internal friction angle phi, the Poisson's ratio v and the pressure relief drill hole radius of the roadway surrounding rock are determined; the stress is converted into a stress load under a drilling coordinate system through a coordinate conversion method; on the basis of a Kirsch solving method and by means of the determined drilling radius and the obtained stress load under the drilling coordinate system, the normal stress sigma r, sigma t and sigma v and the shear stress taurt, taurv and tautv of any point within the preset range of the hole under the drilling coordinate system are obtained; based on the M-C strength criterion of the three-dimensional state, the radius r of the pressure relief drilling anti-reflection ring is obtained through solving by means of rock mechanical parameters; and according to the r, the arrangement mode of the pressure relief drill holes is determined. Aiming at unreasonable pressure relief drill hole arrangement and unclear pressure relief parameters in the prior art, the method improves the normativity of roadway surrounding rock drill hole pressure relief.

The invention belongs to the technical field of rock engineering, discloses a carbonaceous slate unsteady creep model construction method based on time-stress evolution, and aims to solve the problem that creep parameters of existing carbonaceous slate cannot be accurate due to the fact that the creep parameters are regarded as constants or expressed by a nonlinear function. The unsteady creep model comprises an improved generalized Kelvin body and a Newton body with a switch, wherein the Newton body takes the stress level into consideration, and the improved generalized Kelvin body is connected with the Newton body with the switch in series. According to the method, more accurate creep parameters of the carbonaceous slate can be obtained, and a theoretical model is provided for tunnel surrounding rock creep deformation research and tunnel long-term stability analysis of a carbonaceous slate stratum tunnel penetrating through an extremely high crustal stress area.

The invention relates to an intelligent prediction system and method for gas overrun of a mine stope face, and the system comprises a data collection module, a gas concentration analysis module, a ground stress analysis module, and a gas overrun early warning module. The data acquisition module is used for collecting gas extraction drill hole single-hole accurate metering data and ground stress measurement while drilling data in the working face recovery process; the gas concentration analysis module and the crustal stress analysis module are used for performing corresponding fitting analysis on the acquired single-hole accurate measurement data of the gas extraction drill hole and the crustal stress while-drilling monitoring data to obtain gas and crustal stress early warning indexes; and the gas over-limit early warning module carries out cooperative early warning on gas over-limit accidents in the recovery process according to the fitting result. According to the invention, real-time early warning of gas overrun of the mining roadway is realized, and the production safety of a mine is effectively ensured.