Quaternion covering layer three-dimensional modeling method based on virtual contour constraint

Abstract

The invention discloses a quaternion covering layer three-dimensional modeling method based on virtual contour constraint. The method comprises steps of using a geological boundary line of a regionalquaternary covering layer as a boundary control line, a closed curve buffer area algorithm based on a convex angle arc, a strategy of combining overall buffer and local buffer to obtain a series of internal buffer lines which are uniformly distributed by using, calculating thickness values corresponding to the internal buffer lines according to the maximum buffer times and the average thickness ofa quaternary covering layer on the histogram, and constructing a plane virtual thickness contour line; lowering the contour line from the terrain surface to a corresponding depth according to the thickness value of the virtual thickness contour line to obtain a four-system covering layer three-dimensional virtual thickness contour line, processing the three-dimensional virtual thickness contour line by adopting a Delaunay triangulation algorithm of Bowyer-Watson, and constructing a four-system covering layer bottom interface; and processing Boolean shearing operation of the bottom interface of the quaternary covering layer and the bedrock geologic body through a spatial partition binary tree vector shearing algorithm, and finally extracting the quaternary covering layer three-dimensionalgeologic body with a complex large-scale region form.

Description

technical field [0001] The invention relates to a three-dimensional modeling method of Quaternary covering layers based on virtual contour constraints, and belongs to the field of three-dimensional geological structure modeling. Background technique [0002] In China, where urbanization is exploding, the rapid expansion of urban scale and population expansion has brought about increasingly serious situations such as ground space congestion, geological environment deterioration, and frequent geological disasters, which have become important factors affecting the sustainable development of urban social economy. These situations urgently require the city to develop into underground space, and urban planning should be better combined with geological environment evaluation. Specific issues include evaluation of major engineering geological conditions (such as subway construction), foundation stability evaluation, underground space utilization evaluation, and land subsidence. and ...

AI Technical Summary

Problems solved by technology

However, for large-scale areas at the city level, due to constraints such as economic conditions, it is extremely difficult to deploy a sufficient number of projects to conduct actual surveys on unevenly distributed Quaternary overburdens.

Therefore, for the 3D visual representation of Quaternary overburden with complex morphology in large-scale areas, the modeling methods of the above three different data sources are no longer applicable

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