Three-dimensional modeling method for geological mass

Abstract

The invention discloses a three-dimensional modeling method for a geological mass. The method comprises the steps that a geological mass model to be constructed and geometric description of spatial fissure surfaces are given; for the geological mass model, a trace formed by boundary surfaces and the fissure surfaces is solved, and edges are obtained; the edges are subjected to regularization processing, directed rings are formed after a boundary operator is utilized and search is performed, and directed surfaces are formed based on property judgment on the directed rings and inclusion relation judgment on the directed rings; the directed surfaces are subjected to regularization processing, directed shells are formed after the boundary operator is utilized and search is performed, and directed bodies are formed based on property judgment on the directed shells and inclusion relation judgment on the directed shells; and all the formed directed bodies are subjected to mass topological check and mass volume sum check. According to the method, it is not needed to introduce any artificial hypothesis, the geological mass with arbitrarily complicated space is formed completely according to actual geologic structure surface characteristics, and therefore the method has important application value in engineering practice and has positive theoretical significance for development of a non-continuum mechanic numerical method.

Description

technical field [0001] The invention relates to a geological block realized based on a three-dimensional geological modeling technology, in particular to a three-dimensional modeling method for a complex geological block, and belongs to the technical field of numerical calculation and analysis of discontinuous medium mechanics in rock mass engineering. Background technique [0002] During the entire geological history period of its formation and evolution, the rock mass medium forms a complex geological shape after undergoing various complex and uneven geological actions. From the perspective of macroscopic geological structure, rock mass can be regarded as a block system cut by several spatial geological structure planes. [0003] At present, methods of discontinuous medium mechanics such as discrete element method and discontinuous deformation analysis all take the discrete block system as the research object, and regard the rock mass as a complex spatial rock block aggreg...

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Problems solved by technology

However, due to the very complex topographic and geological conditions in nature, even if the topographic and geological conditions of the rock mass are simplified, it is impossible to manually divide the blocks like dealing with two-dimensional problems. Therefore, it is necessary to establish a three-dimensional model of complex geological blocks. modeling method

[0004] In 1983, P.M.Warburton proposed a method of block subdivision using an infinite plane, but this method cannot represent the complex block shape of the rock mass, and the generated blocks can only be limited to convex bodies, which is different from The specific conditions of the geological block in the actual project do not match

Later, many scholars began to study the three-dimensional modeling of complex geological blocks by assuming that the fracture surface is a finite-sized spatial polygon (or circle), starting from the three aspects of algebraic topological homology, vector and directed graph theory, although The starting point is different, but basically what is realized is the 3D modeling of geological blocks of general nature

[0005] From the actual implementation, it can be found that many of the above methods either only give rigorous mathematical theories but do not give specific algorithms for programmable realization, or introduce some artificial intervention items or lack necessary regularization processing, resulting in complex blocks. The modeling process is incomplete, or there is no complete and operable judgment criterion to verify the completeness and accuracy of 3D modeling of complex geological blocks

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