589 results about "Fracture zone" patented technology

The invention discloses a vibration table test device and a test method for seismic dynamic response of a fault-crossing mountain tunnel. The test device comprises an earthquake simulation vibration table, a laminated shear model box, surrounding rock, a fault fracture zone, a tunnel model and a monitoring and measuring system. Wherein the earthquake simulation vibration table inputs earthquake waves and provides earthquake power; the bottom of the laminated shear model box is fixed on the earthquake simulation vibration table, and the laminated shear model box is filled with surrounding rocks and fault fracture zones; the fault dip angle is 90 degrees, and left and right surrounding rock elevations are inconsistent; the tunnel model comprises a non-shock-absorption layer and a shock-absorption layer which are buried in the surrounding rock in the model box in parallel and perpendicularly intersect with a fault fracture zone. The monitoring and measuring system is used for measuring tunnel acceleration and strain, surrounding rock acceleration, fault acceleration and the like in the seismic oscillation process. The test device can simulate the dynamic response process of the fault-crossing mountain tunnel under the action of an earthquake, and time evolution and spatial distribution characteristics of tunnel earthquake response are determined.

The invention discloses a diastrophic stratum deformation analysis and calculation method for an active fault zone, and relates to the technical field of geological engineering calculation, and the method comprises the following steps: (1) constructing a three-field dynamic coupling model based on an energy density gradient, and unifying dimensions of physical parameters of a mechanical field, a seepage field and a temperature field as an energy density function; according to the diastrophic stratum deformation analysis and calculation method for the active fault zone, the problems of multi-physical field splitting and time scale solidification in a traditional method are solved by constructing an energy-mediated multi-field dynamic coupling model and a space-time decoupling algorithm. On the basis of an interaction path of energy density gradient tensor unified mechanics, seepage and temperature fields, instantaneous bidirectional feedback of three-field parameters is achieved, compared with a traditional model, the pore pressure prediction error is reduced, and the calculation efficiency is improved; and meanwhile, the joint simulation efficiency of the second-level seismic event and the ten-thousand-year tectonic motion is improved, the interface parameter continuity error is controlled, and the precision and stability of cross-scale modeling are improved.

The invention provides a burnt rock aquifer water disaster prevention and control design method which comprises the following steps: exploring mine geological and hydrogeological conditions, determining burnt rock distribution characteristics, an aquifer range and a water-rich abnormal region, and constructing a burnt rock aquifer water diversion characteristic judgment system; on the basis of the residual bursting coefficient of the burnt rock, a calculation formula of the development height of the burnt rock stratum water-flowing fractured zone is corrected, and the development height of the working face mining overlying strata water-flowing fractured zone is accurately judged through the formula; constructing a burnt rock water-bearing layer risk evaluation system according to the relationship between the burnt rock water-bearing layer position and the development height of the water-flowing fractured zone; according to the danger evaluation system, the'intercepting-dredging-building 'burnt rock aquifer layering treatment method is provided. Compared with traditional aquifer water disaster treatment, the method has the advantages that the aquifer damage of the burnt rock can be judged more accurately, layered treatment is more economical and efficient, and the method is of great significance to prevention of underground water inrush accidents and underground water loss and realization of safe, efficient and green mining of coal.

The invention belongs to the technical field of shale oil and gas development, and particularly discloses a multi-source information fused horizontal well casing deformation risk section prediction method, which comprises the following steps: representing shaft crack zone information; establishing a work area construction model and an attribute model; with shaft crack zone information as a constraint, disturbance is performed on crack information predicted based on seismic data, and a three-dimensional crack network model is established; a work area geomechanical model is established, and crustal stress distribution characteristics in the shaft direction of the horizontal well are obtained; a work area casing deformation comprehensive database is established by combining casing mechanical attribute data and work area fracturing construction parameters, and fault zone activity factors are obtained based on the Mohr-Coulomb criterion; and establishing a stratum-fracture-wellbore model, obtaining a mathematical model of fracture zone activity factors and casing deformation degrees, and dividing casing deformation risk grades. According to the method, accurate recognition of the well periphery crack network and advanced pre-judgment of the well periphery crack activation risk and the wellbore casing deformation can be achieved, and guidance is provided for formulating targeted casing deformation prevention and control measures.

Systems and techniques may include enhancing production of a natural resource from a reservoir in the earth.By pumping and circulating a material through a reservoir, where the material interacts with proppant or formation material in fracture zones, the interaction reduces permeability in an overproductive fracture zone and redirects flow to an underproductive fracture zone. Through this self-correcting feedback mechanism, flow redistributes more uniformly across multiple fracture zones over time, resulting in more even permeability distribution and improved reservoir performance. The systems and techniques enable passive treatment using chemical solutions that create self-correcting permeability changes, leading to more controlled and efficient resource recovery from subsurface reservoirs.

The invention relates to the technical field of coal mine hydrological monitoring, in particular to a combined monitoring method based on directional drilling underwater coal mining dynamic fracture development. The method comprises the following steps: determining the predicted height of a water-flowing fractured zone, and obtaining a target horizon according to the predicted height of the water-flowing fractured zone; the position of a key layer is determined according to the target layer, and a ground drilling position is arranged on the ground; drilling according to the ground drilling position, the key layer and the target layer; when the hole is drilled to the target horizon, the water flowing fractured zone development height of the to-be-detected working face is obtained and recorded as the drilling water flowing fractured zone development height; arranging an underground detector, determining the development height of the water-flowing fractured zone according to the underground detector, and recording the development height as the development height of the micro-seismic water-flowing fractured zone; and acquiring the development height of the detected water-flowing fractured zone based on the development height of the drilling water-flowing fractured zone and the development height of the micro-seismic water-flowing fractured zone. Directional drilling and micro-seismic monitoring are combined, the water flowing fractured zone is comprehensively analyzed, and the accuracy of an analysis result is improved.

The invention provides a rock burst and mine earthquake collaborative treatment method based on regional fracturing, and the method comprises the following steps: selecting a working surface, determining a plurality of rock burst control layers with rock burst risks, then determining a plurality of mine earthquake control layers with mine earthquake risks, and determining a plurality of mine earthquake control layers with mine earthquake risks; performing main control layer analysis on all the rock burst control layers in the fissure zone preferentially to determine a multi-stage rock burst main control layer, performing main control layer analysis on all the mine earthquake control layers above the fissure zone to determine a multi-stage mine earthquake main control layer, and performing logging correction analysis; according to the length and width of the working face, the thickness of the rock burst control layer and the number of the mine earthquake control layers, the layout design of separate layer fracturing is determined, the treatment method achieves comprehensive prevention and control of the mine area risk, the treatment effect on the rock burst and the mine earthquake is remarkable, the disaster risk is reduced, and a powerful guarantee is provided for mine safety production.

The invention discloses a surrounding rock deformation treatment method which comprises the following steps: determining the range of a strong influence area in a fault through advanced geological detection, and adopting a graded support strategy for different influence areas: when the width of the strong influence area in the fault is three times greater than the span of a tunnel, arranging an NPR anchor cable group on the ground surface to form a pre-reinforcement system; during benching, NPR anchor rods and steel arches are combined for supporting in a fault non-weak-influence area, and long and short NPR anchor cables are additionally arranged in a fault weak-medium-influence area for collaborative supporting; double-gradient grouting is implemented in front of the boundary of the moderately strong affected zone, a peripheral reinforcing shell is formed by grouting at the first gradient of 2-3 MPa, and an internal permeation network is formed by grouting at the second gradient of 3.5-4.5 MPa; through real-time monitoring of the axial force of the steel arch, a linkage response mechanism of anchor cable secondary tensioning and grouting and supplementing is established. According to the method, through combination of advanced pre-reinforcement, graded support and dynamic regulation, active control over tunnel surrounding rock deformation of the fault fracture zone is achieved, and the collapse risk and the support structure damage risk are effectively restrained.

The invention discloses a water-preserved mining distinguishing method for in-situ protection of floor confined water. The water-preserved mining distinguishing method comprises the following steps that the average distance between a mining coal seam floor and an aquifer, the average thickness of the aquifer, the average permeability, the working face length and the advancing distance length are determined; the average depth of the mining floor fracture zone and the average thickness and the average permeability of all rock strata below the fracture zone are tested, and the equivalent permeability is obtained; the water pressure of the confined aquifer is tested and counted, and target water pressure is determined; calculating the allowable coal mining loss water resource quantity; determining a critical equivalent permeability coefficient; the equivalent permeability is compared with the critical equivalent permeability, and the calculated water inflow is compared with the safe recovery water inflow of the working face; and finally, the feasibility of water-preserved mining of in-situ protection of the confined water of the floor is judged. Based on the dynamic water storage and release characteristics of the confined aquifer, the mining floor effectively obstructs the overall water blocking performance of the rock stratum, the water-preserved mining judgment method for in-situ protection of the confined water of the floor is provided, operation is easy and convenient, and the field applicability is high.

The invention relates to the technical field of mining data processing, and particularly discloses a coal seam layered fully mechanized caving mining water flowing fractured zone height prediction method, which is used for solving the problem that a traditional material point method is difficult to accurately capture a fracture extension path and height, and the method comprises the following steps: monitoring a P-wave and S-wave arrival time difference of a micro-seismic event in real time through a micro-seismic sensor array; a micro-seismic event processing host is used for calculating a three-dimensional expansion path and an accumulative effect of a fracture based on the first equation set, the second equation set and the third equation set in combination with a stress intensity factor and a fracture expansion speed formula, and finally the final height of a fractured zone is accurately predicted by using a fractured zone height prediction formula and integrating rock stratum physical attributes and stress data. Transmitting to anchor rod adjusting equipment for supporting optimization; according to the method, the fracture extension path, the speed and the cumulative effect are calculated, and the physical attribute and the stress environment of the rock stratum are combined, so that the height prediction precision of the fracture zone is remarkably improved, and the safety and the real-time monitoring effectiveness in the coal mining process are ensured.

The invention relates to the technical field of rock mass testing, in particular to a tunnel water-rich fault fracture zone area loading simulation test device and method.The tunnel water-rich fault fracture zone area loading simulation test device comprises a test box, and a partition plate is arranged in the test box; the partition plate divides the test box into a first area and a second area, and the second area is filled with a rock-soil sample; a lateral loading structure; a vertical loading structure; the simulated fault test structure comprises a mounting frame fixedly connected to the partition plate, a driving structure and a simulated fault unit, one end of the driving structure is hinged to the mounting frame, and the other end of the driving structure is connected with the simulated fault unit; the fault simulation unit is hinged to the mounting frame and used for simulating an adjustable fault, and the technical problems that an existing test device cannot dynamically adjust the fault fracture width and the dip angle according to the load effect and cannot perform real-time coupling simulation on a hydrological seepage field are solved.

The invention discloses a method for judging the relative movement intensity of different parts of strike-slip fracture, which is used for determining the difference of the relative movement intensity of different parts in the same section by fitting the vertical displacement change curve of different sections and calculating the vertical displacement change rate in the same section. And determining the relative activity intensity of different sections of the strike-slip fracture through a mathematical method of calculating the area of the broken line enveloping range of the depth values of the vertical displacement of different sections and the length-to-surface ratio. By applying the method, the relative activity intensity of different segments of the strike-slip fracture can be effectively judged, and an effective scheme is provided for professional technicians for researching storage control and reservoir control of the strike-slip fracture. And the phenomena of activity intensity difference between different sections of the strike-slip fracture and relatively large personal error in the statistical process are neglected.

The invention discloses a coal mine water flowing fractured zone observation method, device and system and a storage medium, and belongs to the technical field of coal mine safety monitoring and early warning. The method comprises the following steps: constructing an initialized transparent geologic model; acquiring historical fracture electrification method data; the initialized transparent geologic model is used for processing historical fracture electrification method data so as to construct a roof water flowing fractured zone virtual mirror image; processing the virtual mirror image of the roof water flowing fractured zone by using a numerical simulation algorithm to obtain simulation monitoring data; obtaining monitoring difference data according to the simulation monitoring data and the electrical method data characteristics corresponding to the early warning threshold; optimizing the initialized transparent geologic model according to the monitoring difference data to obtain a target geologic model; acquiring fracture electrification method data through a drilling electrical method technology; inputting the fracture electrification method data into the target geologic model to obtain monitoring data; judging whether the monitoring data exceed an early warning threshold value or not; and if yes, triggering an early warning mechanism.

The present invention belongs to the field of geotechnical engineering, in particular a test method for an in-situ deformation modulus of a large-area tectonic fault zone, comprising the following steps: determining the test site / in-situ; testing the deformation modulus (E D ) Overburden and the velocity of sound waves; drilling a test hole; installing a test pressure load device; Step V: performing a deformation test; analytical solution calculation of the deformation modulus of the large-scale tectonic fault zone in the lower part of the overburden and obtaining the deformation modulus of the tectonic fault zone E. The large-scale test size and load of the present invention far exceeds the requirements of current domestic and foreign specifications and recommendations. A tunnel is not required, and testing can be carried out at any open location without disturbing the rock mass, and the costs are low.

The invention discloses a three-dimensional geological model dynamic updating system and method based on multi-modal data fusion, and belongs to the technical field of geological engineering and information. According to the method, multi-source data of geological radar, earthquake, drilling, remote sensing and the like are integrated, and after unified formatting and quality optimization preprocessing, geological features of a stratum interface, a fault zone and the like are automatically extracted by using a deep learning network; multi-source feature data fusion is realized through space-time registration and attention; constructing a three-dimensional geologic model by adopting a TIN and Octree mixed structure based on a fusion result; dynamic updating of the model is realized through incremental detection and a local reconstruction mechanism, and the boundary of the model is optimized by adopting a radial basis function interpolation. According to the method, the problems of single data, updating lag and the like of a traditional method are solved, the modeling precision and efficiency are remarkably improved, and reliable support is provided for geological engineering decision making.

The invention discloses a large-section tunnel excavation supporting system crossing a fault fracture zone, which comprises a plurality of self-propelled advanced large pipe sheds arranged on a tunnel vault before excavation and a plurality of advanced small pipes arranged on a tunnel side wall, after excavation of each layer is completed, steel-like fiber concrete is preliminarily sprayed on the top arch and the side wall of the corresponding excavation face, system anchor rods are constructed, then multiple steel supports are arranged on the top arch and the side wall of the corresponding excavation face in the longitudinal direction of the tunnel, and a plurality of cover-weight-free consolidation grouting holes are evenly formed in the top arch and the side wall of the whole section for grouting; and then a plurality of system anchor rods and drainage systems are evenly arranged on the top arch and the side wall of the excavation face, then reinforcing meshes are arranged between the steel supports, and then secondary injection of imitated steel fiber concrete is conducted. The problems that in the prior art, when a tunnel crosses a fault fracture zone, roof fall and collapse accidents are prone to occurring through common excavation supporting measures, and the construction safety and the project progress are seriously affected are solved.

The invention discloses a high-pressure water-rich section surrounding rock grouting construction method which comprises the following steps: carrying out advanced geological forecast on surrounding rock, and describing geological conditions; drilling an advanced deep hole in the tunnel face to obtain a core sample, and discharging part of underground water through the advanced deep hole; performing a physical and mechanical test on the obtained core sample to obtain physical and mechanical characteristics and permeability characteristics of a rock-soil body, dividing the surrounding rock into a loose damage area, an elastic-plastic deformation area and an elastic deformation micro-disturbance area by combining an advanced geological forecast detection result, a geological condition description result and theoretical analysis, and locking a grouting area; and advanced deep hole dynamic grouting is conducted on the locked grouting area, specifically, a grouting anti-seepage wall is formed between the elastic deformation micro-disturbance area and the elastic-plastic deformation area, a grouting reinforcement area is formed in the loose damage area, and a grouting reinforcement area is formed between the grouting reinforcement area and the grouting anti-seepage wall. The method is high in pertinence, and the problems of large deformation, water burst and the like of surrounding rock when the tunnel passes through the high-pressure water-rich fault fracture zone can be effectively solved.

The invention discloses a roof strata fissure zone monitoring method, which comprises the following steps: S1, layering an overlying strata in the vertical direction according to the height of the overlying strata to form a plurality of sublayers; s2, performing drilling operation on each sub-layer to form a mounting hole for mounting an optical fiber sensor, mounting the optical fiber sensor in each mounting hole, and monitoring the fracture development condition of each sub-layer in real time by using the optical fiber sensor so as to judge the development height of the fractured zone; s3, after the installation of the optical fiber sensor is completed, the installation hole is sealed by using concrete grout so as to prevent the interference of the external environment on the optical fiber sensor; and S4, the optical fiber sensor is connected with a monitoring station, so that the monitoring station can receive, process and analyze transmission data from the optical fiber sensor to judge the development height of the overlying strata fissure zone. The roof rock stratum fissure zone monitoring method has the advantages of simple steps, high monitoring efficiency and the like.

The invention discloses a stochastic finite fault source model establishment method, which comprises the following steps of S1, determining a geometrical shape of a seismic fault based on regional geological data and seismic monitoring data, and estimating a non-planar fault parameter and a fault plane average sliding amount in combination with historical data and an empirical formula; s2, estimating distribution and sliding strength of concave-convex bodies and obstacles on the fault surface according to historical seismic inversion data, and obtaining the sliding amount of each sub-fault by randomly disturbing the average sliding amount; s3, the discrete fault plane serves as a sub-fault unit, and after an initial fracture point and the average fracture speed are determined, random fracture initial time conforming to normal or power law distribution is generated based on a random number method; s4, calculating the seismic oscillation time history of each sub-fault by adopting a random point source method, superposing contributions, introducing the influence of a shallow velocity structure V30, and generating a three-dimensional seismic oscillation field; and S5, comparing actual strong earthquake record adjustment parameters, and outputting a multi-risk-level earthquake motion parameter evaluation result after iterative optimization. According to the method, by fusing randomness and empirical data, the simulation precision of the seismic source model on the uncertainty of the seismic process is improved, the influence of the potential maximum-magnitude earthquake possibly occurring in the active fault zone in the future can be effectively estimated, the seismic oscillation simulation precision and the calculation efficiency can be improved, and the method is suitable for engineering structure aseismic design and seismic disaster evaluation.

The invention discloses a mining affected zone aquifer in-situ recovery method, equipment, medium and product, and relates to the field of mining subsidence science, and the method comprises the following steps: carrying out modeling based on obtained geological and hydrological data containing overlying strata aquifer occurrence information, and obtaining numerical simulation results under different working face parameter combination conditions; establishing a boundary function expression of the coal pillar side mining flowing water fractured zone according to geological and hydrological data and the numerical simulation result; according to the boundary function expression of the coal pillar side mining water flowing fractured zone, determining the intersection position of the water flowing fractured zone and the aquifer; according to the intersection position, a plugging position grouting instruction is generated; determining a water-resisting layer reconstruction opportunity and a filling area of a grouting filling zone; according to the filling area of the grouting filling belt, a water-resisting layer grouting instruction is generated; and after the reconstruction of the water-resisting layer is completed, generating a plugging position damage instruction. Additional subsidence and mine water resource loss can be prevented, and then the aquifer and the surface ecological environment are protected.

The invention discloses a rock hydraulics-based high-position separation water monitoring and drainage control method, which comprises the following steps of: determining a separation water development position according to an early-stage exploration result; a monitoring drill hole and a drainage drill hole which are communicated with the separation water are constructed on the ground surface above the development position of the separation water; a water pressure sensor is arranged at the bottom in the monitoring drill hole; a water suction pump is arranged in the drainage drill hole; a plurality of micro-seismic sensors are arranged in a roof rock stratum of the working face at set intervals, and the development height of the water flowing fractured zone is determined according to micro-seismic signals collected by the micro-seismic sensors; determining the thickness of a separation layer water-resisting layer according to the development height of the water flowing fractured zone; determining an abscission water warning water head according to the thickness of the abscission water water-resisting layer; determining a warning water level according to the separation water warning water head and the separation water bottom plate elevation obtained through early-stage exploration, and setting the determined separation water warning water level as an early warning water level; the water level data in the monitoring drill hole are collected in real time, the real-time water level is obtained, when the real-time water head exceeds the early warning water level, the water suction pump is started to pump separation water, and separation water level control is achieved.

The invention relates to a multifunctional seabed shield tunnel construction period structure catastrophe test device and test method, and relates to the technical field of tunnel engineering. Comprising a model test box, a model tunnel, a seabed high-pressure simulation device, a shield construction tunneling device and a data acquisition system, the model test box is used for soaking the similar material to be saturated, so that a seepage field and a stress field in the model box reach an initial static equilibrium state; the seabed high-pressure simulation device is used for enabling a seepage field and a stress field in the model test box to reach a dynamic stable balance state; the model tunnel is mounted in the model test box; the shield construction tunneling device is used for excavating a model tunnel; the data acquisition system is used for acquiring basic physical parameters of the surrounding rock and the fault fracture zone tested by the triaxial compression test and recording catastrophe test data. The device can simulate the surrounding rock-lining structure catastrophe caused by duct piece crack expansion due to the influence of seabed high water pressure in the construction stage of the large-diameter seabed shield tunnel.

The invention relates to the technical field of oil-gas exploration, and discloses a strike-slip fracture identification method and device based on a multi-seismic attribute fusion technology, and the method comprises the steps: firstly obtaining the seismic data and geological background data of a target region, and then carrying out the recognition of a strike-slip fracture based on the geological background and seismic data; seismic section interpretation is carried out, coherence, curvature, tensor thickness, symmetry illuminance attributes and maximum likelihood attributes are calculated, and finally, according to the fracture scale, optimal attributes are determined and quantitative fusion is carried out to identify the strike-slip fault zone. According to the method, for fractures of different scales, different attributes are preferably selected for quantitative fusion, the advantage complementation effect between different features is achieved, the fracture recognition precision and sensitivity are improved, and researchers are effectively assisted in research work in the aspects of fracture and well location.

The invention belongs to the technical field of geological disaster monitoring, and discloses an automatic geological disaster monitoring device and monitoring method. The method comprises the following steps: completing joint monitoring of surface goaf deformation on the ground; for a bent sinking zone, a fissure zone and a caving zone of the goaf, an electrical method system, a micro-seismic monitoring system and a distributed optical fiber sensor are arranged underground, dynamic tracking and monitoring of underground resistivity, fissure zone expansion, caving zone rock mass breaking change and the boundary of the goaf are conducted respectively, and delineation of underground abnormal bodies is completed; and cooperative monitoring: completing cooperative dynamic coupling monitoring of deformation processes of the curved sinking zone, the fissure zone and the caving zone of the goaf. According to the method, the accurate delineation of the underground abnormal body is completed; and dynamic coupling monitoring of ground and underground deformation of the coal mine goaf is realized.

The invention discloses a tunnel rock-soil deformation identification method and system, relates to the technical field of tunnel and underground engineering monitoring and early warning, and remarkably improves the reliability and timeliness of tunnel weak surrounding rock deformation risk identification. In the abrupt change response link, a time domain convolutional network and a displacement acceleration self-adaptive strengthening mechanism are introduced, so that the capturing capability of the system on nonlinear displacement surge is improved in a leap-over manner; according to the method, the acceleration component is focused and the physical constraint weight is applied, so that the sudden change event is locked in real time, and accidents such as unstability of the tunnel face are prevented from being missed in report; in order to solve the problem of point cloud registration distortion of a joint development area, the geological law of a rock mass structural plane is fused into a registration algorithm, and overall deformation misjudgment caused by rock mass local dislocation is inhibited from the source through a Gaussian mixture model coupling normal elastic deformation threshold and a tangential coulomb friction criterion; the measurement precision of laser scanning in a fracture zone and a fault zone breaks through environmental limitation, and a reliable basis is provided for supporting decision.

The invention discloses a method for selecting a post-mining grouting position for thick-layer roof sandstone water disasters. The method comprises the following steps: (1) finely probing a geologic body of a to-be-grouted area; (2) representing the development degree of the native fracture and the water inflow based on a water inflow observation result in the working face pushing and mining process in combination with the development degree of the native fracture, and evaluating the development condition of the water guide channel of the working face; (3) predicting the development height of the water flowing fractured zone; (4) selecting a grouting layer position; and (5) selecting a grouting position. The method disclosed by the invention has the following beneficial effects: 1, fine exploration work is carried out, comprehensive and accurate cognition of geological conditions is realized, and a foundation is built for subsequent work; 2, the grouting layer position and the plane position are selected scientifically and reasonably, blind selection is effectively avoided, and the water control and roof reinforcement effects are guaranteed; errors and waste are reduced, and construction efficiency and quality are improved.

The invention relates to the technical field of gas reservoir geology evaluation and exploration through earthquake three-dimensional data, in particular to a model and method for predicting rock stratum natural gas development potential based on earthquake three-dimensional data. The method comprises the following steps of: obtaining fault displacement and fault zone width, normalizing data to obtain strike-slip fracture deformation strength S, and predicting rock stratum natural gas development potential according to the strike-slip fracture deformation strength S, so that quantitative correlation between strike-slip fracture structure characteristics and natural gas yield is realized. The fracture reservoir control effect can be converted into a quantifiable evaluation standard from experience judgment, and meanwhile reference is provided for complex structure zone fracture reservoir control research.

The invention discloses a key layer presplitting settlement control method based on overlying strata fracture angle arrangement. The method comprises the steps that geological mining parameters of a target mine are collected and determined; based on the physical and mechanical parameters of each rock stratum, determining the horizon height of the key stratum in combination with a thick and hard rock stratum judgment criterion; according to coal seam mining parameters and overlying strata lithology, the height of a water flowing fractured zone is judged, and high and low horizon classification is conducted on the water flowing fractured zone by combining the horizon of the key horizon; according to the development law of overlying strata damage along the fracture angle from bottom to top, the presplitting position in the horizontal direction of each layer key layer in the presplitting range is calculated and determined, and full-section directional presplitting cutting is carried out; based on thick and hard rock stratum mining-induced stress distribution characteristics and a damage deformation transmission mechanism, a working face moving boundary and a reduction distance of a building (structure) protection coal pillar after key stratum presplitting are calculated and determined. According to the method, presplitting implementation is guided based on the key layer fracture rule, and a new technical approach is provided for subsidence control of the mining area.

The invention provides a real-time early warning method and system for the jamming risk of an open-type TBM crossing fault fracture zone, and relates to the technical field of data processing.The method comprises the steps that an analysis area is constructed with three fixed stress monitoring points as vertexes, and a circumcircle of the analysis area is calculated; defining a circular analysis area according to the circumcircle, and performing fan-shaped partitioning on the circular analysis area to obtain a plurality of fan-shaped analysis units; according to the stress change rate data of each fan-shaped analysis unit, combining the corresponding fan-shaped area to determine a weight coefficient, and determining a dynamic adjustment value; calibrating the tunneling parameter by using the dynamic adjustment value to obtain a calibrated tunneling parameter; and according to the calibrated tunneling parameters, risk grade comprehensive evaluation is carried out in combination with surrounding rock lithology, joint development conditions and water inflow data revealed by excavation, and grading early warning signals are generated. According to the invention, early warning of the fault fracture zone jamming risk can be realized.

The invention relates to the technical field of tunnel construction management, and discloses a risk assessment system for long tunnel crossing fault fracture zone construction, which comprises a data acquisition module and a risk assessment module. According to the system, a data set is acquired through the data acquisition module, all possible risk factors are comprehensively acquired, a high-quality data assessment result is more accurate, the risk assessment module is provided with an LSTM algorithm model, an assessment data set, a tunnel progress data set and risk indexes are generated through analysis of the algorithm model, and the risk assessment module is provided with a construction period step. Each step corresponds to different construction contents, the risk assessment module judges the construction period step of the current time point according to the tunnel progress data set, if the tunnel progress data set spans from the previous step to the next step, the LSTM algorithm model correspondingly carries out training updating, the risk assessment module compares the risk index with a risk threshold, and the risk assessment module carries out risk assessment. And corresponding reports are output, so that the safety of tunnel site construction is greatly improved, and the robustness of an intelligent updating system is high.