Block cutting and searching method of fractured rock mass based on topological matrix

Abstract

Aiming at the problem of block cutting and searching in fractured rock mass, a method of block cutting and searching in fractured rock mass based on topological matrix is proposed. According to the structural characteristics of fractured rock mass, the data structure of the model is established, which only contains node coordinates (vectors) and a numbering system; the line segments are divided into line segment units, which only intersect at the boundary by the algorithm of line segment intersection and discretization. The number matrix describing the topological relationship of points and lines system is constructed with the intersection and line segment as the core. According to the number matrix and geometric characteristics of spatial line segments, the number matrix for block search is obtained by cutting a non-closed polygon; without any geometric operation, only the index of the number in the matrix is used to search the blocks and form a seamless rock mass model; according to the spatial relationship between the clipped line segment and the block, the block reflecting the internal fracture is generated to form the final fractured rock mass model. Results indicate that this method can identify the distribution of complex blocks and their internal joints and fissures. It also has a great application prospect in the analysis of fractured rock mass.