对强度折减法若干问题的讨论.pdf

第29 卷第4 期 岩 土 力 学 Vol.29 No. 4 2008 年4 月 Rock and Soil Mechanics Apr. 2008 文章编号：1000－7598 －(2008) 04 －1103－04 对强度折减法若干问题的讨论 杨有成，李 群，陈新泽，唐辉明 （中国地质大学工程学院，武汉 430074 ） 摘 要：强度折减法是数值模拟处理边坡稳定问题的常用方法，由于影响该方法计算精度的因素很多，所以该方法仍未在工 程界得到确认和推广。本文采用FLAC （显式拉格朗日有限差分法）进行计算，通过对算例结果进行比较，阐明了在边坡稳 定分析中边界范围和网格的疏密对强度折减法结果的影响，特别地，在边界范围上摆脱了数值模拟方法的建模原则的束缚， 即边界范围取足够大的原则，并用计算结果极好地证明了结论的可靠性。 关 键 词：强度折减法；FLAC ；稳定性系数；边界范围 中图分类号：TU 432 文献标识码：A Discussion on strength reduction using FLAC YANG You-cheng, LI Qun, CHEN Xin-ze, TANG Hui-ming ( Engineering Faculty, China University of Geosciences, WuHan 430074, China ) Abstract: When using numerical simulation methods to solve the stability of slope, the strength reduction method is in common use. But this method is not validated and generalized because there are many factors which affect the precision of results. Using the fast Lagrangian analysis of continua (FLAC) according to the comparison of results we can find out the influences of boundary range and density of the grid in the analysis of slope stability. Especially we get rid of the bondage that is the boundary range should be large enough which is the modeling principle. The results prove the reliability of the conclusions. Key words: strength reduction; FLAC; safety factor; boundary range 1 前 言 2 计算原理 C ϕ F C′ [1] ϕ ′ F F [2] [3] F 1 C′ F