A 3D modeling method of Quaternary overburden based on virtual contour constraints

Abstract

The 3D modeling method of Quaternary overburden based on virtual contour constraints uses the geological boundary of the regional Quaternary overburden as the boundary control line, adopts the closed curve buffer algorithm based on the salient arc, and uses the overall buffer and The strategy of combining local buffers can obtain a series of evenly distributed internal buffer lines, and calculate the corresponding thickness value of the internal buffer lines according to the maximum buffer times and the average thickness of the Quaternary overburden on the histogram, and construct a plane virtual thickness contour; According to the thickness value of the virtual thickness contour, the contour is lowered from the topographic surface to the corresponding depth, and the 3D virtual thickness contour of the Quaternary cover layer is obtained, and the 3D virtual thickness contour is processed by the Delaunay triangulation algorithm of Bowyer-Watson line to construct the bottom interface of the Quaternary overburden layer; the Boolean shear operation of the bottom interface of the Quaternary overburden layer and the bedrock geological body is processed through the spatial partition binary tree vector shearing algorithm, and finally the Quaternary system with complex shapes in large-scale areas is extracted Overburden 3D geological volume.

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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