87 results about "Tectonic stress" patented technology

The invention relates to the technical field of geological engineering safety risk evaluation, in particular to a regional tectonic stress risk quantitative analysis method for tunnel engineering. The method comprises the following steps: collecting multi-source geomechanical parameters, simulating and inverting a tectonic stress field, and verifying the tectonic stress field; constructing a multi-scale geomechanical model, coupling simulation tectonic stress and gravity stress, and generating a stress space basic layer; utilizing Kriging interpolation and inversion decomposition to obtain a stress value and a directional diagram layer; calculating an included angle between the maximum principal stress direction and the tunnel axis, and performing vector decomposition to obtain a vertical stress component; and carrying out standardized normalization on the factors, determining a weight calculation risk value, and finally generating a tectonic stress risk quantitative grading graph and carrying out GIS visual rendering. The tunnel engineering-oriented risk quantitative analysis mechanism is constructed by retaining the directivity and spatial heterogeneity characteristics of the tectonic stress tensor, and the authenticity, resolution and engineering applicability of tectonic stress identification are remarkably improved.

The invention provides a rapid quantitative evaluation method for stability of deep tunnel surrounding rocks in a high tectonic stress area, and belongs to the technical field of deep tunnel surrounding rocks. The method comprises the steps of providing a numerical value and analytical method for analyzing external stress distribution of a surrounding rock loose circle of a deep tunnel in a high tectonic stress area, then providing a surrounding rock loose circle range evaluation method fusing the numerical value and the analytical method, and finally rapidly predicting the maximum thickness of the surrounding rock loose circle through two dimensionless factors capable of reflecting high tectonic stress characteristics. According to the method, aiming at the deeply-buried tunnel in the high tectonic stress area of the Sichuan-Tibet railway, an analysis method considering engineering calculation precision and speed requirements is developed by taking deep rock mass engineering digital-numerical value integrated analysis as an idea and combining natural advantages of a prior analysis method in the aspect of rapid calculation; the important requirements of dynamic design of deep tunnel engineering and three-dimensional positive analysis of surrounding rock stability are met.

The invention relates to the technical field of geological exploration, and discloses a three-dimensional tectonic stress field inversion method based on real geological structure features, which comprises the following main steps: S1, data acquisition and preprocessing; s2, constructing a three-dimensional geologic model; s3, preliminary calculation of a stress field; s4, carrying out stress field inversion and optimization; and S5, carrying out refined correction and application on the stress field. According to the method, the limitation of a traditional two-dimensional method is overcome by establishing the accurate three-dimensional geologic model, and the three-dimensional modeling can accurately reflect underground complex geologic structures (such as faults and wrinkles), so that the accuracy of stress field inversion is remarkably improved. Especially under complex geological conditions, the three-dimensional model can better simulate an actual underground structure, and errors caused by simplified hypothesis are reduced.

The invention relates to the technical field of three-dimensional visualization, in particular to a geological exploration three-dimensional visualization analysis system which comprises a spatial discretization construction module, an interface geometric feature extraction module, an attenuation factor calculation module, an internal stress field inversion module and a voxel lighting effect mapping module. According to the method, by constructing a voxelization space system and combining projection coordinates of a top plate and a bottom plate of the stratum, the geometric bending degree and local thickness variation characteristics of the stratum interface are accurately quantified, and a mapping relation between a spatial form and an internal stress field is established by utilizing geometric conduction factors; the method can invert tectonic stress distribution from stratum extrusion deformation and thickness reduction trends, effectively identify a hidden stress concentration area in a geologic body, dynamically adjust optical attributes of regular hexahedron units according to stress intensity, convert abstract mechanical characteristics into visual three-dimensional images, realize spanning from pure geometric display to internal physical mechanism analysis, and improve the analysis accuracy of the geologic body. And the identification precision and the early warning capability of the geological disaster source are obviously improved.

The invention discloses a deep-buried tunnel rockburst-collapse composite disaster area identification method, which comprises the following steps: S1, obtaining a collapse tendency evaluation index based on passive source tendency evaluation of a rock mass basic quality grading index; s2, judging whether a transition section of a fractured rock mass and a complete rock mass exists or not according to geological conditions of the evaluation area, and correcting ground stress; s3, performing active source tendency evaluation based on a rock mass strength-stress ratio to obtain a rockburst tendency evaluation index; s4, identifying a potential rockburst-collapse composite disaster area and a rockburst or collapse single disaster type disaster area according to the rock mass quality grade value and the rock mass strength-stress ratio; according to the method, the deep-buried tunnel rockburst-collapse composite disaster area is identified based on the rock mass quality grade and the rock mass strength-stress ratio, and a scientific disaster area identification basis is provided for deep underground engineering with strong tectonic stress and large stratum variability.

The invention discloses a tectonic stress factor-based landslide risk prediction method suitable for Sichuan-Tibet regions, and belongs to the technical field of geological disaster prevention and control. The method aims at solving the problem that traditional landslide prediction under strong tectonic stress and complex terrain in the Sichuan-Tibet region is insufficient in accuracy, and comprises the steps that data are collected and processed into DEM raster data, the DEM raster data are converted into point Shapefile data, and terrain point plane coordinates and elevation values are extracted to form a terrain dot matrix associated with global coordinates; calculating the slope length and gradient of the topographic point and the landslide center point, the tectonic stress of the topographic point and the topographic stress, and constructing a tectonic stress magnitude risk factor; determining an area stress field direction in a molecular area and obtaining an included angle of topographic points in a near-far fault area, and constructing a tectonic stress direction risk factor; and calculating the landslide risk of each topographic point, dividing extremely high to extremely low danger areas, and outputting a danger map of the calculation area. The method adapts to Sichuan-Tibet geological features, the prediction accuracy is improved, and a scientific basis is provided for Sichuan-Tibet area landslide prevention and control.

The invention relates to the technical field of geotechnical engineering and geological engineering, and discloses a CO2 geological utilization and storage induced earthquake multi-field coupling numerical analysis method, which comprises the following steps of 1, acquiring rock fault geometric characteristic parameters, reservoir geological characteristic parameters, tectonic stress characteristic parameters and construction parameters of a well production point; 2, simulating the CO2 phase change process according to the seepage field, the temperature field, the chemical field and the stress field, constructing a heat-fluid-solid-chemical multi-field coupling mathematical model in the CO2 injection process, including a seepage source confluence item, a thermal field equation, a reaction rate and effective stress, and realizing simulation of the whole fault activation-fracture process under the heat-fluid-solid-chemical multi-field coupling action; the multi-field coupling analysis is more comprehensive; 3, injection-induced fault activation simulation is carried out, and normal stress and shear stress of the fault surface and the fault slip rate are analyzed; and step 4, non-seismic slippage and seismic slippage are evaluated, corresponding seismic moments and induced seismic magnitudes are output, and the seismic nucleation precision is high.

The invention discloses a structure-karst-unloading coupling degradation high and steep slope collapse physical model experiment system, and relates to the field of slope collapse risk management, and the system comprises a construction module which is used for constructing a high and steep slope model containing a karst network; the monitoring module is used for synchronously capturing micron-order opening and micro-fracture evolution information of an internal structural surface of the model and stress-seepage field distribution data; according to the method, the model is guaranteed to be highly matched with the actual geological environment through dynamic calibration of the adaptation degree, micron-sized synchronous capture of internal structure evolution, stress distribution and seepage field data of the model is achieved, and the monitoring precision is improved through multi-device collaborative layout and data credibility verification; and cooperatively applying tectonic stress, karst seepage and graded unloading according to a real time sequence, and dynamically adapting to the quasi-steady-state requirements of the stress-seepage field of the model.

The application provides a simulation method and device for constructing a stress field, and relates to the technical field of stress simulation. The method comprises the following steps: obtaining tectonic data of a working area reservoir; constructing a geological model according to the tectonic data of the working area reservoir; determining mechanical properties, stress loading modes, boundary constraint conditions and rock physical parameters of the geological model through test data of uniaxial and triaxial rock mechanics tests of the working area reservoir; and determining the tectonic stress field distribution of the reservoir by using a finite element numerical simulation method according to the mechanical properties, stress loading modes, boundary constraint conditions and rock physical parameters of the geological model. The application determines the mechanical parameters and boundary stress conditions of the geological barrier based on the geological model and the mechanical model, thereby simulating the tectonic stress field distribution of the reservoir, accurately revealing the ground stress distribution characteristics of the reservoir in the research area, and having wide applicability and providing a theoretical support for predicting favorable areas of the oil and gas reservoir.

The invention relates to a clastic rock reservoir porosity evolution recovery method under a tectonic extrusion background, and belongs to the technical field of petroleum and natural gas exploration and development. The method comprises the following steps: calculating the total compaction pore reduction amount of clastic rock samples, selecting samples with similar burial depths, similar rock structures and different maximum paleotectonic stresses as selected samples, and calculating the total compaction pore reduction amount of the clastic rock samples according to the difference value of the total compaction pore reduction amount corresponding to two selected samples with adjacent maximum paleotectonic stresses. Obtaining the lateral compaction pore reduction amount of the maximum palaeotectonic stress, and establishing a function relationship between the lateral compaction pore reduction amount and the maximum palaeotectonic stress; the lateral compaction hole reduction amount of each time of lateral extrusion in the multiple lateral extrusion processes is calculated; according to the total compaction hole reduction amount and the lateral compaction hole reduction amount, the vertical compaction hole reduction amount is calculated, and a relation chart of the vertical compaction hole reduction amount and the buried depth is established; and drawing a geological historical period porosity evolution curve of the clastic rock reservoir under the tectonic extrusion background by utilizing an inversion back-stripping method and combining the lateral compaction pore reduction amount and the vertical compaction pore reduction amount. The method solves the problem that the lateral and vertical compaction hole reduction amount cannot be quantitatively calculated in the evolution recovery process of the porosity of the foreland basin reservoir.

The present invention provides a method for identifying apparent strike-slip faults with multi-phase tectonic stress field superposition. The method for identifying apparent strike-slip faults with multi-phase tectonic stress field superposition includes: Step 1, based on the logging and mud logging data of the drilled wells, conducting fine structural interpretation of the standard layer; Step 2, performing characterization of the direction conversion of the multi-phase tectonic stress field; Step 3, performing characterization of the changes in the strike-slip component and the extension component; Step 4, identifying the nature of the apparent strike-slip faults. The method for identifying apparent strike-slip faults with multi-phase tectonic stress field superposition systematically analyzes from three aspects of geometry, kinematics and dynamics, and takes the ratio of the calculated fault extension component to the strike-slip component as the basis for identifying apparent strike-slip faults, with high practical value and strong operability.

The invention relates to a paleotectonic stress recovery method based on section form measurement, which comprises the following steps of: firstly, carrying out three-dimensional description on a stratum position and a fault in processed geoseismic data by utilizing petrel software in order to strengthen research on regional evolution; the method comprises the following steps: firstly, constructing an outline map, secondly, encrypting an isoline in the constructed outline map, selecting a sliding direction and displacement of a section, measuring a dip direction and a dip angle of the section, and finally, analyzing and forming ancient stress analysis by utilizing Win-sensor software through combining the measured fault dip direction and dip angle.

The invention relates to the technical field of shale gas geology, in particular to a method for depicting a breaking joint body in a breaking joint body development area, and the method comprises the steps: firstly, generating an initial breaking joint body probability body based on interpretable machine learning fusion seismic attributes, and building a three-dimensional space distribution model containing large and medium faults after manual interactive interpretation and well seismic calibration; on the basis, large and medium-sized faults serve as a deterministic skeleton, a fracture development rule is predicted in combination with paleotectonic stress field simulation and a rock fracture criterion, a three-dimensional discrete fracture network model constrained by geomechanics is constructed and then coupled with a matrix model, and a model set is generated by defining an uncertainty parameter space. And screening out an equivalent model group through historical matching, performing prediction verification and iterative optimization by using recent production data, and finally obtaining a three-dimensional space distribution model of the high-precision breaking joint body. According to the method, closed loop of static identification and dynamic verification is realized, and the depicting precision and the geological reliability are remarkably improved.

The invention provides a method for determining a crustal stress direction, and belongs to the field of geomechanics. The method comprises the following steps: collecting core data, logging data and geochemical data, identifying deposition characteristics, a sequence interface and single well lithology of a to-be-analyzed area, carrying out rock mechanical parameter logging interpretation, establishing a rock dynamic-static mechanical parameter conversion model, and determining single well rock mechanical parameter distribution of a target area; rock core observation and imaging logging interpretation are carried out through rock core data and logging data, the trend distribution rule of cracks in the vertical direction is determined, and the fast transverse wave orientation is further determined; and establishing a corresponding relation model between the fast transverse wave orientation and the trend distribution rule of the vertical crack, and establishing a ground stress direction discrimination standard to realize the determination of the ground stress direction. Compared with the prior art, the method for judging the direction of the maximum principal stress suitable for a complex structural area and a complex lithologic section is provided.

The present application relates to a kind of methods for restoring porosity evolution of clastic reservoirs under tectonic extrusion, belonging to the technical field of oil and gas exploration and development.The method comprises the following steps: calculating the total compaction and pore loss of clastic rock samples, selecting samples with similar burial depth, similar rock structure and different maximum paleo-tectonic stress as selected samples, obtaining the lateral compaction and pore loss of the one with larger maximum paleo-tectonic stress by the difference of total compaction and pore loss corresponding to the two selected samples adjacent to the maximum paleo-tectonic stress, and establishing the functional relationship between lateral compaction and pore loss and maximum paleo-tectonic stress;calculating the lateral compaction and pore loss of each lateral extrusion in multiple lateral extrusions;calculating the vertical compaction and pore loss according to the total compaction and pore loss and lateral compaction and pore loss, and establishing the relationship chart between vertical compaction and pore loss and burial depth;using the inverse back stripping method, combining lateral compaction and pore loss and vertical compaction and pore loss, and drawing the porosity evolution curve of clastic reservoirs in geological history under tectonic extrusion.This method solves the problem of being unable to quantitatively calculate lateral and vertical compaction and pore loss in the process of restoring porosity evolution of foreland basin reservoirs.

The invention relates to a method for calculating the true maximum effective paleotectonic stress of sandstone in folds, and belongs to the technical field of petroleum and natural gas exploration and development. The calculation method comprises the following steps: fitting a function relationship between a sample compaction index corresponding to each fold and a distance between a sample and a neutral surface, and further calculating a compaction index at the neutral surface of each fold; according to the compaction index at the neutral surface of each fold and the known maximum palaeotectonic stress of each fold, fitting a function relationship between the compaction index at the neutral surface and the maximum palaeotectonic stress; calculating the maximum paleotectonic stress fitting value of each sample and the maximum paleotectonic stress fitting value of the corresponding fold, and obtaining the paleotectonic stress correction value of each sample by subtracting the maximum paleotectonic stress fitting value and the maximum paleotectonic stress fitting value; fitting a function relationship between the paleotectonic stress correction value of each fold sample and the distance between the sample and the neutral surface; and for the to-be-tested sample at any position in the fold, correcting the known maximum paleotectonic stress through the paleotectonic stress correction value of the to-be-tested sample to obtain the real maximum effective paleotectonic stress. According to the calculation method, the known maximum paleotectonic stress can be corrected, so that the real maximum effective paleotectonic stress of sandstone at different positions in the wrinkles is obtained.

The application discloses a method for reconstructing a paleo-tectonic stress field based on vertical displacement of vertical fractures, and aims at solving the problem of low accuracy of the prior art in establishing a paleo-tectonic stress field. V V‑MAX V‑MIN V V V‑MAX V‑MIN V V‑MAX V‑MIN H V h H The method avoids the possible large human errors in the identification of typical structures and the matching with the theoretical model, and significantly improves the accuracy.​​​​​​​​​​​​​

The application provides a deep and shallow buried division method and system of underground engineering based on tunnel excavation effect, and belongs to the technical field of computer-aided design. The scheme comprises the following steps: obtaining an initial ground stress field of a tunnel area; sampling the tunnel area, carrying out a conventional triaxial test, and obtaining a full stress-strain curve of surrounding rock; obtaining ground stress information of a given engineering section according to the initial ground stress field of the tunnel area, establishing a three-dimensional numerical model of the tunnel, carrying out numerical simulation by using a constitutive model considering strain softening, and obtaining a stress field after tunnel excavation; and based on the full stress-strain curve and the stress field after tunnel excavation, deep and shallow buried division is carried out. The scheme fully considers that the occurrence of tunnel disasters under strong tectonic stress is significantly affected by true three-dimensional stress, considers the tunnel excavation effect, carries out deep and shallow buried division based on the true three-dimensional stress field, provides clear suggestions for the selection of the constitutive model of surrounding rock in the design process, and provides clear guidance for support design.

This invention relates to the field of oil and gas reservoir geological exploration technology, specifically a method for identifying multiple fracture stages in buried hill oil and gas reservoirs based on tectonic stress field evolution. The method includes the following steps: Tectonic evolution history analysis step: Geological data of the target buried hill oil and gas reservoir area are systematically collected. Based on seismic profiles, stratigraphic contact relationships, tectonic deformation characteristics, and chronological data, a comprehensive analysis is conducted to construct a multi-stage tectonic evolution history of the area from the Paleozoic to the Cenozoic, accurately determining the geological age and tectonic nature of each key tectonic event. Compared to existing technologies, this application establishes a quantitative discrimination model based on mechanical principles through paleostress field numerical simulation and quantitative prediction of theoretical fracture parameters. This standardizes and quantifies the fracture stage identification process, significantly reducing the uncertainty caused by human factors, improving the objectivity and repeatability of the discrimination results, and achieving a leap from qualitative analysis to quantitative discrimination.

The present invention belongs to the fields of petroleum geology and tectono-diagenesis, and specifically discloses a method for determining the direction of the ancient maximum compressive stress during the formation of orthogonal tensile fractures. By combining the petrographic characteristics of fluid inclusions trapped in different minerals within orthogonal tensile fractures and the analysis of the development types of fluid inclusions, conducting laser Raman spectroscopy tests on methane-rich inclusions and microthermometric analysis of coexisting brine inclusions, using the pressure-volume-temperature simulation method to obtain the fluid pressure and temperature during the mineral crystallization process, combining the trapped temperature data with the burial history curve of this area, identifying the opening process and state of two groups of orthogonal tensile fractures, obtaining the time coupling relationship when the orthogonal tensile fractures are in the open state, and finally obtaining the direction of the ancient maximum compressive stress during the simultaneous opening process of the orthogonal tensile fractures according to tectonic stress analysis. It provides a new idea and method for judging the direction of the ancient maximum compressive stress during the formation of orthogonal tensile fractures.

The invention belongs to the field of petroleum geology and tectonic-diagenesis, and particularly discloses a method for limiting the paleo-maximum compressive stress direction when an orthogonal tensional fracture is formed. Analyzing the lithofacies characteristics of fluid inclusions captured in different minerals in the orthogonal tensional fracture and the development types of the fluid inclusions, performing laser Raman spectrum testing on the methane-rich inclusions, and performing microscopic temperature measurement analysis on the symbiotic brine inclusions; the fluid pressure and temperature in the mineral crystallization process are obtained through a pressure-volume-temperature simulation method, captured temperature data are combined with a burial history curve of the region, the opening process and state of two groups of orthogonal tensional fractures are judged, the time coupling relation that the orthogonal tensional fractures are in the opening state is obtained, and according to tectonic stress analysis, the time coupling relation of the orthogonal tensional fractures in the opening state is calculated. And finally, obtaining the ancient maximum pressure stress direction in the simultaneous opening process of the orthogonal tensile crack. And a new thought and method are provided for judging the ancient maximum compressive stress direction when the orthogonal tensional crack is formed.

The invention discloses a method for constructing a hard rock push type dumping numerical model. The method comprises the following steps: constructing an initial ground surface model according to a plane range and a ground surface; simulating a toppling deformation control steep dip structural plane on the initial earth surface model, and constructing and generating a first earth surface model; simulating control conditions of hard rock pushing type dumping on the first earth surface model, and constructing and generating a hard rock pushing type dumping numerical model; the hard rock pushing type control conditions comprise tectonic stress generated by simulating river valley undercutting, pushing load provided by an inclined slope outer structural surface and rock mass fracture in the hard rock mass rotating process; when rock mass fracture in the hard rock mass rotation process is simulated, macroscopic fracture simulation and microscopic fracture simulation are supported. According to the technical scheme, on the basis of a traditional dumping model considering the self-weight effect, the influence effect of an external load on dumping deformation is additionally considered, and the method is suitable for special push-type dumping which does not meet empirical criteria so as to solve the problem that a conventional dumping numerical model is insufficient in hard rock push-type dumping calculation adaptability.

The invention provides a maximum horizontal principal stress obtaining method based on a Mohr-Coulomb criterion, and belongs to the technical field of reservoir rock mechanics research. The maximum horizontal principal stress obtaining method comprises the steps that formation pore pressure and rock strength parameters are obtained through comprehensive logging data, and drilling fluid column pressure is calculated through drilling fluid density data; measuring the minimum horizontal principal stress; the well wall caving width is obtained through the dual-hole-diameter logging data; according to a calculation equation, factors such as tectonic stress, drilling working conditions and formation fluid are fully considered in the method, and the well wall caving width is obtained through well logging information; indoor rock core testing is not needed; the calculation precision is high, and a scientific basis is provided for oil reservoir engineering, drilling engineering and yield increase engineering.

The invention relates to the technical field of geological disaster analysis, and particularly discloses a controllable time sequence superposition seismic load structure physical simulation experiment system which comprises a structure physical simulation device, a seismic source hammering system, a seismic wave simulation vibration table and a data monitoring module. The seismic source hammering system can simulate earthquakes with different coordinates, different seismic source depths and different seismic load intensities, the seismic wave simulation vibration table can realize simulation of multiple types of seismic waves, through cooperative use of the seismic source hammering system and the seismic wave simulation vibration table, sequence activities of the earthquakes can be truly presented, and the dynamic effect of the seismic source hammering system has time sequence superposition performance; through the arrangement of the construction physical simulation equipment, the seismic wave simulation vibration table and the seismic source hammering system, the dynamic coupling of the construction stress field and the time sequence seismic motion can be realized; the method is helpful for researching the deformation and displacement process of each geologic body model in the critical state of the tectonic stress field under the seismic oscillation disturbance.

The invention provides a metallogenic prediction system based on a knowledge graph, and belongs to the technical field of mines. Comprising a data acquisition module used for constructing a mining area multi-source monitoring data set; the knowledge graph construction module is used for generating a mining area disaster knowledge graph representing the incidence relation between the mining area underground structure state and the disaster induction factors; the risk knowledge portrait construction module is used for constructing a disaster risk knowledge portrait for depicting mining area hidden geological disaster characteristics; the risk assessment module is used for constructing a collapse risk coefficient, a tectonic stress concentration coefficient and an induced earthquake sensitivity coefficient; and the risk response module is used for constructing a comprehensive risk coefficient, presetting a comprehensive risk threshold value, comparing the comprehensive risk coefficient with the comprehensive risk threshold value, triggering an alarm instruction and performing optimization. The characteristics of mining area activities and the like are reflected from multiple dimensions, overall description of mining area hidden geological disaster risks is achieved, judgment is not depended on a single monitoring index, and mining area mining safety is improved.

The invention discloses a tall mountain ground motion response simulation device, and relates to the technical field of rock mass engineering geodynamics, and the tall mountain ground motion response simulation device is characterized in that a seismic power loading unit respectively bears a model box equipped with a mountain model through two six-degree-of-freedom vibration tables; the freezing and thawing cycle loading unit realizes programmed temperature control in a box through a compressor-condenser-capillary tube-heat conduction tube system, and an acceleration sensor, a temperature sensor and a fiber bragg grating are pre-embedded in the model; the fault movement loading unit is formed by sequentially and flexibly connecting first to fourth displacement plates to simulate fault displacement; the tectonic stress loading unit adopts a loading rod to push a sub-plate to laterally apply pressure to the mountain model in the model box; the monitoring unit fuses sensor data and high-speed camera images, and analyzes the catastrophe process in real time through a computer. According to the device and the method, tectonic stress, fault movement, freeze-thaw cycle and earthquake power quadruple combined loading are integrated for the first time, catastrophe dynamics mechanisms of tall mountains are accurately revealed, and the device and the method are suitable for major engineering geological disaster prevention and control research.

FIELD: underground mining in rocks.SUBSTANCE: method of mining a working in a rock mass exposed to tectonic stresses includes making a straight cut with the formation of a cutting cavity in the centre of the mine working, determining the direction of the greatest compressive stress in the massif and forming the mine working. If the greatest compressive stress is found in the horizontal transverse direction to the contour of the working, the cutting cavity is expanded by exploding pre-contour and contour blasthole charges in the horizontal transverse direction to the contour of the mine working, whereas as a result of the explosion, a dome-shaped part of the cavity of the mine working is formed due to the natural destruction of the rock.EFFECT: increase in the stability of the workings' boundary rocks.1 cl, 3 dwg

The invention provides a strong tectonic stress rockburst section tunnel arch curve design method, and relates to the technical field of high crustal stress tunnel rockburst prevention and control. The method specifically comprises the steps that the basic building limit requirement of a tunnel is obtained, and the transverse maximum width and the vertical maximum height of a tunnel arch curve are determined according to the basic building limit requirement; determining a horizontal crustal stress, a vertical crustal stress and a surrounding rock grade perpendicular to the axial direction of the tunnel hole through crustal stress measurement, and calculating a lateral pressure coefficient; if the lateral pressure coefficient of the tunnel is not smaller than 1 and the surrounding rock grade is III or above, it shows that strong tectonic stress exists in the tunnel area, and then an arch curve of the tunnel is constructed; and drawing a tunnel cross-section diagram of the tunnel based on the arch curve of the tunnel. According to the method, the tunnel arch profile curve is optimized through the elliptic equation, and the problem that tangential stress concentration is likely to be generated in the design of an arc-shaped arch crown of a conventional tunnel section under strong tectonic stress is solved.

The invention relates to the technical field of petroleum geological exploration and geophysical data processing, and discloses a fault rod extraction method and system based on a morphological erosion algorithm, which can be used for removing noise in low signal-to-noise ratio data and accurately segmenting a fault fracture zone, and carrying out erosion operation based on a directional anisotropic structural element customized by a tectonic stress field. The erosion operation is carried out along the dominant direction of the fault, the fracture zone is compressed towards the core axis of the fault by using the iterative erosion and feedback correction means constrained by the fault trend model, and the artificial limb on the fault rod is eliminated and the missing part on the fault rod is complemented by using the multi-attribute fusion verification and topological optimization method. According to the fault rod extraction method, a fault rod has higher authenticity and spatial continuity, a generated data body is input into a three-dimensional Kriging interpolation gap filling and then is converted through a coordinate system, so that the output fault rod data body can directly meet the precision required by tectonic framework modeling, and the fault rod extraction method suitable for low-signal-to-noise-ratio data is provided.

The invention belongs to the technical field of oil exploration, and discloses a crack propagation path quantitative prediction method based on a double extreme value principle. The method comprises the following steps: obtaining a stress-strain curve and related mechanical parameters through a rock mechanics experiment; constructing a rock fracture criterion based on a double extreme value principle; establishing a quantitative prediction model of the crack propagation angle and length; combining with three-dimensional tectonic stress field simulation to realize spatial prediction of a crack propagation path; and the reliability of the prediction result is verified through measured data. The method disclosed by the invention reveals a crack propagation mechanism from the perspective of energy evolution, has the advantages of solid physical foundation and adaptability to complex geological conditions, remarkably improves the precision of crack length and direction prediction, and provides reliable technical support for evaluation and development optimization of an unconventional reservoir crack system.