6 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 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 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.

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.