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通过将强度折减法与有限差分软件FLAC3D相结合,充分利用FLAC3D对模拟塑性破坏和塑性流动采用的“混合离散法”比有限元法中通常采用的“离散集成法”更为准确、合理的优点,较为准确的对巷道的稳定性进行判定。在软件的模拟过程中,通过不断的调整影响岩石强度指标的c、φ,改变岩体强度折减系数F,从而得到在不同折减系数下巷道的广义塑性区发展状况。当广义塑性区趋于贯通,或广义塑性应变和位移发生突变,说明此时的折减系数就是巷道的最小稳定安全系数,并通过潘三矿17101(3)低抽巷的稳定性实例分析,得出巷道的最小稳定系数为1.5。
By combining the strength reduction method with the finite difference software FLAC3D, FLAC3D is more accurate than the “discrete integration method” commonly used in finite element method “Hybrid Discrete Method ” adopted in simulating plastic failure and plastic flow , Reasonable advantages, more accurate determination of the stability of the roadway. In the process of software simulation, the generalized plastic zone development of the roadway under different reduction factors is obtained through constant adjustment of c and φ which affect the rock strength index. When the generalized plastic zone tends to penetrate or the generalized plastic strain and displacement change suddenly, it shows that the reduction coefficient at this time is the minimum stable safety factor of the roadway. Based on the stability analysis of the 1734 (3) Obtained the minimum stability of the roadway factor of 1.5.