Study On 3-Dimensional Network Simulation Based On The Character Of Structural Planes In Rock Mass

The 3D network simulation of structural planes in rock mass is not only an important part of the block theory, but also an important subject of study on rock mass mechanics. However, conventional methods of dominant groups partitioning do not consider the character of structural planes and index weight effected on grouping results when building 3D network model of structural planes, and there is a lack of quantitative index to evaluate the character of structural planes. Meanwhile, the existing technology for 3D network simulation can not search the key block sliding triggered due to the propagation of interior structural planes. In order to further improve the technology of 3D network simulation to characterize the spatial distribution of structural planes more realistic to solve the problems, this paper carried out some relevant researches, and the main contents and conclusions were as follows.Based on the principles of the Analytic Hierarchy Process, weight distribution and comprehensive evaluation of eight factors which affect the mechanical character of structural planes in rock mass were conducted. The quantitative index of CSPC value was introduced for character of structural planes, and an evaluation system was established for character of structural planed in rock mass. It partitions the grade and corresponding mechanical parameters of structural planes by CSPC value. A new classifying method called CSPC method was proposed for character of structural planes. It can calculate the CSPC value of structural planes which lays foundation for dominant groups partitioning based on the character of structural planes in rock mass, determine the grade of structural planes, and as well as semi-quantitatively forecast the mechanical parameters of structural planes.The coalescence strength was regarded a standard to estimate whether the ligament was coalescence or not. Numerical simulate method was used to calculate the coalescence strength and peak strength of 175 samples in different arrangement projects for discontinuous structural planes. The coalescence coefficient was introduced to quantitatively describe the ratio changing between coalescence strength and peak strength, its affect by the dip angle of ligament and structural planes, friction coefficient of structural planes, and lateral stress and continuity rate has been studied. The functional correlation was quantitatively analyzed between coalescence strength with above factors and peak strength, and coalescence criterion of ligament was provided for discontinuous structural planes in rock mass. This criterion could be used to judge whether two discontinuous structural planes should be connect or not, and the 3D network model based on this criterion could search the key block sliding triggered due to the propagation of interior structural planes.Based on the theory of variable fuzzy sets, a new method of dominant groups partitioning based on the character of structural planes in rock mass was proposed. Compared with traditional method, it could not only consider the geometrical orientation information effected on grouping results, but also consider the character of structural planes and index weight effected on grouping results. Meanwhile, this method could also forecast the mechanical parameters of every group, which effectively reduces the difficulty of selecting mechanical parameters for block stability analysis.Based on the above findings, the paper proposed the detailed algorithm flow of the results application, and then programmed using software VC++. The program has been achieved five functions which were partitioning grade of structural planes, forecasting mechanical parameters of structural planes, identifying and judging discontinuous structural planes, and partitioning dominant groups based on the character of structural planes. It laid a good foundation for more realistic characterized the spatial distribution of structural planes.