谈用有限元双系数折减法计算边坡安全系数

Discussion on calculating slope safety factor by finite element double strength reduction method

对目前的研究作了简单回顾,发现目前研究的重点在于如何确定合理的配套折减原则和边坡的整体安全系数.通过比较分析得出结论:1)唐芬等所提出的配套原则相比于最短路径原则更具有物理和力学上的意义,但对c和tanφ 按固定比例折减是否有更充分的依据,有待研究.2)双安全系数法的安全系数有明确的力学意义,而等效单一安全系数法在这一点上显得不太明确.由于目前的设计规范安全系数是单一安全系数,建议提出更加有明确力学意义的单一安全系数,或者在相关规范中给出双安全系数的规范取值,以便工程应用.

A brief review of the current researches reveals that the current research focuses on how to determine a reasonable matching reduction principle and the overall safety factor of the slope. Through comparative analysis, the conclusions are drawn: 1)The mactching principle proposed by Tang Fen et al. has more physical and mechanical significance than the shortest path principle, but whether there is a more sufficient basis for the reduction of c and tan ? in terms of a fixed ratio remains to be studied. 2)The safety factor of the double safety factor method has a clear mechanical significance, and the equivalent single safety factor method is not clear at this point. Since the current design specifications use a single safety factor, it is recommended to propose a single safety factor with more explicit mechanical significance, or to give separate allowable values of the double safety factor in the relevant design codes for engineering application.