The Method And Developing Of Building 3-D Block System For Complex Rock Mess

Rock-masses are divided into many closed blocks by deterministic and stochastic discontinuities and engineering interfaces in complex rock-mass engineering. Determining the sizes, shapes, and adjacent relations of blocks is important for stability analysis of fractured rock masses.This paper proposes an algorithm for identifying spatial blocks based on a hierarchical 3D Rock-mass Structure Model (RSM). First, a model is built composed of deterministic discontinuities, engineering interfaces, and the earth's surface, and the deterministic blocks surrounded by these interfaces are traced. Then, in each deterministic block, a network model of stochastic discontinuities is built and the stochastic blocks are traced. Building a unitary wire frame that connects all interfaces seamlessly is the key for our algorithm to identify the above two kinds of blocks. Using this algorithm, geometric models can be built for block theory, discrete element method, and discontinuous deformation analysis.Construction of random block system block method is similar with deterministic blocks, but deterministic blocks are too large, which include a lot of stochastic discontinuities. The large number of data can not be deal with int a one-time. So this paper proposes a method that dividing stochastic discontinuities built in a deterministic block into small pieces. Then the stochastic blocks system are traced through the intersection among interfaces, editing intersecting line, searching closed loop and tracing stochastic blocks and so on. Then the stochastic blocks cut by the interfaces of small blocks should be merged. Finally, cutting the stochastic blocks by the interfaces of the deterministic blocks to built the final stochastic blocks system. In this thesis, a system(BlockModel) is developed in object-oriented Microsoft Visual C++ ? (release 6.0) to achieve the above methods, it can provides a geometric model for the block theory, discrete element method, discontinuous deformation analysis method and makes pre-treatment work for stability analysis of rock.Finally, in order to test and calibration of this construction method, the Left Bank of Xiaowan Hydropower Station is taken as an example. Using the above system to built three-dimensional rock slope block system.