11 results about "Triangular facet" patented technology

The invention provides a deep cavern layered surrounding rock stability evaluation method, which comprises the following steps: firstly, carrying out geometric modeling on a layered rock mass based on a Voronoi diagram, and constructing a layered rock mass model capable of accurately reflecting an irregular form and internal discontinuous characteristics of a natural rock layer in combination with unstructured triangular mesh generation; then, the stratified rock mass model is imported into an FDEM simulation analysis framework, a stratified rock mass numerical model capable of simulating the continuous deformation process and the discontinuous fracture process at the same time is established, and follow-up stress analysis and research on the rock mass and the stratum in the fracture process are facilitated; on the basis, the whole process of cavern excavation is simulated, a cavern stratified surrounding rock model is obtained, and stress analysis is conducted on the cavern stratified surrounding rock model; and finally, outputting a stress analysis result, carrying out stability evaluation, identifying the characteristics of stress, displacement, crack distribution and the like, and realizing the evaluation of the stability of the surrounding rock of the cavern and the positioning of a risk area.

The present application relates to a kind of rock-socketed foundation bearing capacity compensation design method considering rock mass constraint, comprising: establishing rock-socketed foundation calculation model, determine its consolidation boundary condition in rock layer;Calculate the horizontal soil resistance of triangle distribution produced when foundation rotates;Solve the resisting moment of horizontal rock resistance to base center;The deformation of base is decomposed into integral subsidence and rotating component;Determine the calculation formula of base zero stress point position, and establish base vertical pressure distribution model;Establish the overall balance equation group, and solve the foundation rotation angle and zero stress point position by iteration calculation;Calculate the maximum compressive stress of base and evaluate the bearing capacity compensation effect;Finally, section internal force analysis and reinforcement design are carried out.The present application provides additional resisting moment by quantifying rock mass constraint, effectively reduces the maximum compressive stress of base, provides theoretical basis and technical support for improving foundation bearing capacity and optimizing foundation size, and is especially suitable for rock-socketed foundation design in high intensity seismic region.

The embodiment of the application discloses a CAD-based three-dimensional terrain geological model modeling method, device and medium, relates to the CAD modeling technical field, and is used for solving the problem of low reliability of the existing three-dimensional modeling mode. The method comprises the following steps: acquiring multi-source heterogeneous data corresponding to a current modeling type for preprocessing to obtain a discrete point set; if it is determined that the current modeling type is a terrain modeling type, performing dimension reduction and profile division on the discrete point set to obtain a triangular facet, and performing dimension increase on a two-dimensional discrete point set corresponding to the triangular facet to obtain a three-dimensional terrain grid model; if it is determined that the current modeling type is a geological modeling type, performing dimension reduction and analysis on the discrete point set to generate a stratigraphic interface; processing the discrete point set through a preset strategy to obtain a geological matrix model, and performing stratigraphic segmentation on the geological matrix model according to the stratigraphic interface to obtain a three-dimensional geological model; and transmitting modeling data corresponding to the obtained model to a browser for rendering and display based on an application server.

The invention discloses an aggregate three-dimensional shape quantification method and device, and the method comprises the steps: carrying out the registration and packaging of surface patch point clouds of an aggregate at a plurality of visual angles, and obtaining a three-dimensional point cloud of the aggregate; performing triangulation on the three-dimensional point cloud to obtain a surface mesh model formed by a plurality of triangular patches; geometric parameters in the surface mesh model are extracted, and curvature indexes of the aggregate are determined based on the geometric parameters; wherein the geometric parameters comprise a vertex coordinate set formed by vertex coordinates of the triangular patches, a connection relation between the triangular patches, and interior angles and unit normal vectors of the triangular patches; performing global ellipsoid fitting based on the vertex coordinate set to determine the ellipsoid of the aggregate; and determining the comprehensive curvature of the aggregate according to the ellipsoid and the curvature index so as to quantify the three-dimensional shape of the aggregate. The problems that an existing aggregate scanning device is low in automation and intelligence degree, and an aggregate morphology quantification method is low in precision are solved. And comprehensive and accurate quantification of the three-dimensional morphology of the aggregate is realized.

The application provides a calculation method of a crown arch surrounding rock collapse depth considering excavation unloading stress redistribution, comprising the following steps: step S1: a triangular formula is used to calculate the collapse arch height before excavation; step S2: a tunnel radius, surrounding rock bulk density, cohesive force and internal friction angle are collected; step S3: stress decomposition and stress redistribution analysis are carried out after excavation, and the crown arch surrounding rock collapse depth is obtained. The crown arch surrounding rock collapse cavity depth of the tunnel can be more accurately predicted, the surrounding rock support force is determined, and a reasonable dynamic design basis is provided for the tunnel construction through a fault fracture zone.

The invention relates to the technical field of high and steep side slopes, and discloses an ecological long bag construction process for a high and steep side slope, which comprises the following steps: covering the side slope with a protective net, arranging an intercepting ditch along the top of the side slope, and arranging a drainage platform along the bottom of the side slope; the ecological long bags are laid along the surface of the slope, and the steel wire rope outer net is laid after the ecological long bags are laid; an upper group of metal anchor rods and a lower group of metal anchor rods are implanted into the ecological long bags spread on the surface of the side slope, and the metal anchor rods are anchored into a rock stratum by more than or equal to 70cm. The protection net is laid on the surface of the side slope, the triangular distribution metal anchor rod system deeply embedded in the rock stratum is implanted, a three-dimensional anchoring network is formed by combining the metal ropes connected in series, soil slippage and gravitational erosion of the high and steep side slope are effectively resisted, surface runoff dredging is optimized through the arrangement of the intercepting ditch and the drainage platform, and the drainage effect is improved. And the risk of soil loosening caused by rainwater permeation is greatly reduced.

The invention provides a three-dimensional geologic body attribute assignment method and system, relates to the technical field of three-dimensional geologic modeling, and solves the problems that in the prior art, when a complex construction area is encountered, judgment failure and assignment failure are likely to occur. The method comprises the following steps: extracting vertex coordinates and index information of all triangular patches on the surface of a three-dimensional geologic body model to calculate an axis alignment bounding box corresponding to each triangular patch; the minimum value and the maximum value of the axis alignment bounding box in the X direction, the Y direction and the Z direction are collected to correspondingly generate a plurality of points to be judged, and a vertical ray is synchronously generated for each point to be judged in the Z-axis direction; the corresponding candidate patches are reserved, and effective intersection points between the candidate patches and the vertical rays are detected; and sorting each effective intersection point, and synchronously determining the stratum attribution of each point to be judged according to the stratum information of the adjacent effective intersection points after sorting, so as to give a corresponding attribute value. According to the method, the precision of geological attribute assignment is remarkably improved.

The invention discloses a tunnel fractured rock mass hydraulic coupling fracture FDEM simulation method and system, and relates to the technical field of rock mechanics and rock engineering. The method comprises the following steps: acquiring fracture information of a target area in a target tunnel and mechanical property parameters of a surrounding rock sample; according to the fracture occurrence and connectivity, the fracture type is determined; constructing an excavation numerical model of the target tunnel by utilizing an FDEM simulation program according to the mechanical property parameters and the fracture types; hydraulic coupling fracture simulation is executed based on the excavation numerical model; in the simulation process, normal stress and tangential stress generated by water flow on adjacent triangular units on the two sides of each target unit are calculated according to the fracture type; the target unit is a quadrilateral unit with a fracture path; the normal stress and the tangential stress are converted into corresponding nodal forces; and the node force is applied to the corresponding target unit, and the fracture opening degree is updated. According to the invention, the instability mechanism of the deep tunnel surrounding rock under the combined action of water pressure and ground stress can be accurately simulated.

This application discloses a method, apparatus, equipment, medium, and product for shale gas platform site selection based on seismic risk assessment, relating to the field of platform site selection. The method includes: obtaining the fault hazard of a grid based on the shear stress and normal stress of triangular facet elements; inverting the stress field based on focal mechanism data to obtain the in-situ stress field of the triangular facet elements; clustering the maximum principal stress directions of the triangular facet elements and updating the maximum principal stress directions based on the cluster centers to obtain the maximum principal stress directions of the grid; interpolating the in-situ stress fields of the triangular facet elements to obtain the in-situ stress field of the grid; obtaining the seismic susceptibility of the grid based on factors such as the grid's historical seismic activity, fault hazard, in-situ stress field, historical earthquake frequency, historical earthquake energy, and maximum principal stress direction; and determining the optimal well placement location based on the grid's seismic susceptibility, fault hazard, and maximum principal stress direction. This application improves the rationality of shale gas platform site selection.

The application provides a three-dimensional geological body attribute assignment method and system, relates to the technical field of three-dimensional geological modeling, and solves the problems of judgment failure and assignment failure when a complex structure region is encountered in the prior art. The method comprises the following steps: extracting vertex coordinates and index information of all triangular facets on the surface of a three-dimensional geological body model to calculate an axis-aligned bounding box corresponding to each triangular facet; collecting minimum and maximum values of the axis-aligned bounding box in X, Y and Z directions to generate a plurality of to-be-judged points, and generating a vertical ray along the Z-axis direction for each to-be-judged point; retaining corresponding candidate facets and detecting effective intersection points between the candidate facets and the vertical ray; sorting each effective intersection point, determining the stratigraphic attribution of each to-be-judged point according to stratigraphic information of adjacent effective intersection points after sorting, and assigning corresponding attribute values. The application significantly improves the precision of geological attribute assignment.

The application provides a method, device, equipment and readable storage medium for predicting peak shear strength of rock joints, the method comprising: scanning joint data of a rock to be predicted by a three-dimensional laser scanner, wherein the joint data comprises a plurality of joint point cloud data; converting a joint surface of the rock to be predicted into triangular microelements through the plurality of joint point cloud data; obtaining parameter data of the joint surface through the triangular microelements, wherein the parameter data comprises a plurality of normal stresses, a basic friction angle, a joint micro-asperity inclination angle, a uniaxial compressive strength and an average inclination angle of all microelements in an effective contact part of the joint surface of the rock to be predicted; and inputting the parameter data into a preset strength model to predict the peak shear strength of the joint of the rock to be predicted, wherein the strength model is obtained by predicting parameter data of different rocks under different stress states. The method can accurately predict the peak shear strength of the rock joint under high stress.