颗粒流强度折减法和重力增加法的边坡安全系数研究

将强度折减法和重力增加法的思路引入离散单元法，对土坡安全系数的评价作尝试性研究。运用颗粒流软件，采用强度折减法和重力增加法对边坡进行稳定分析。结果表明颗粒流计算得到的结果与有限元和条分法计算结果比较接近，为计算边坡稳定开辟了一条新的途径。采用颗粒流求解边坡的安全系数不需要条分，也即不需要对条间力做假定，同时不需要假定滑移面的位置和形状，颗粒根据所受到的接触力调整其位置，最终从抗剪强度最弱面发生剪切破坏。最后对强度折减法的不等比例折减提出了不同观点，为今后的研究提供思路。

Slope safety factor by methods of particle flow code strength reduction and gravity increase

trength reduction method and gravity increase method are introduced into the discrete element method for experimental study of slope safety factor. The research of slope stability is carried on by using particle flow code (PFC) software and adopting strength reduction and gravity increase methods, and the result is close to the calculation results of finite element method and slice method. The method opens a new way for calculating slope stability. If using PFC to solve the slope safety factor, slice method is not needed, namely it does not need to make an assumption of the inter-slice force. And at the same time, it does not need to assume the position and the shape of the sliding surface, because the particles adjust their positions according to their received contact forces; and finally, the shear failure of the slope occurs on the weakest surface of shear strength. Different viewpoints are put forward about inequality proportion reduction of strength reduction method, which provide new speculations for future research.