基于FLAC-3D的强度折减法判据的研究

Analysis of Strength Reduction Method Criterion on FLAC-3D

运用FLAC-3D软件对一简单边坡进行了稳定性分析。分别利用计算收敛判据、塑性区贯通判据、有效剪应变增量判据和特征点位移突变判据求出边坡安全系数,并加以对比分析。着重对特征点突变判据进行研究分析,分析发现:监测坡顶和坡面中点位移比监测坡脚处位移更有效;仅从位移大小的突变作为判据标准不够严谨,提出一种通过观察特征点位移与折减系数相关曲线的斜率变化来确定安全系数,斜率突变处对应的折减系数即为安全系数。

FLAC-3D is used to analyze a simple slope The comparative analysis of the safety factors which were calculating by convergence criterion, plastic zone criterion, effective shear strain increment criterion and displacement mutation criterion. By the selection of the ＂feature points＂ and ＂mutations criterion for analysis,The top of the hill and the slope midpoint of displacement monitoring is more effective than detecting the foot of the slope at the displacement ; mutations only from the displacement size as a criterion standard is not stringent enough,and propose a feature point by observing the displacement reduction factor curve slope changes determine the safety factor, the slope of the mutation at the corresponding reduction factor is the safety factor.