基于FLAC~(3D)的强度折减有限差分法巷道稳定性分析

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。

ANALYSIS OF ROADWAY STABILITY BY STRENGTH REDUCTION FINITE DIFFERENCE METHOD BASED ON FLAC~(3D)

In this paper,through combined the strength reduction with finite difference software FLAC3D,make full use of FLAC3D is mode to simulate the plastic damage and plastic flow; using the the advantages of mixed discrete method being more accurate and reasonable than the finite element method is usually used in the discrete-integration method,it is analyzed more accurately the stability of the roadway. In software simulation,through continuous adjustment of the value of the influence of rock strength index c、φ,to change the value of the rock strength reduction factor F,it is got the developing condition of the roadway in generalized plastic zone under different reduction factor.When the generalized plastic zone tends to be cut through,or the mutation of the generalized plastic strain and displacement mutation,illustrate the reduction factor is the minimum safety factor of roadway. Through the stability analysis of 17101( 3) low suction roadway of Pansan mine,it is known that the roadway minimum stability coefficient is 1. 5.