采动断层活化分形界面效应的数值模拟研究

采动断层活化是采矿科学中的重要研究课题，以往的研究没有揭示断层面几何形态对它的影响，针对地质断层面的分形性质，构造了自仿射意义下的分形曲线及含有这种分形地质断层面的地质采矿模型，用数值方法模拟地下开挖引起分形断层面活化的现象，研究和总结了分形断层面对采动岩体沉陷的影响规律。研究表明，采动断层活化具有明显的分形界面效应；采动断层剪切滑移力学行为与其分形维数是相关的，不同分形维数的断层面采动后，导致其

NUMERICAL SIMULATION OF FRACTAL EFFECT INDUCED BY ACTIVATION OF FAULT AFTER COAL EXTRACTION

Activation of fault after coal extraction is an important research subject in the mining science. However,the effect of geometrical morphology of the fault surface on activation has never been revealed by the research in the past. Based on the fractal character of the fault surface, the self affine fractal curves and a geological and mining model are constructed to simulate the fractal character of the surface of the fault. Numerical method is applied to simulate the phenomena of activation of the fractal fault surface after underground coal extraction. The influence of fractal fault surface on subsidence of rockmass, after coal is extraction, is studied and the rules are summarized. The investigation has shown that after coal seam is extracted activation of fault has a remarkable fractal interface effect. And the gliding shear behavior of the fault after coal extraction is correlated with its fractal dimension. Different fractal dimensions of the fault will lead to different stress fields and displacement fields in the nearby rockmass.