基于SPH的土质边坡稳定性及失稳后大变形数值模拟  

Numerical Simulation of Stability and Large Deformation of Soil Slope Based on SPH Method

作　　者：唐宇峰[1,2] 施富强[1,2] 廖学燕[2] 

机构地区：[1]西南交通大学机械工程学院,成都610031 [2]四川省安全科学技术研究院,成都610045

出　　处：《地下空间与工程学报》2018年第1期280-286,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家科技支撑计划:西南山区干线公路路基灾变过程控制与动态调控技术研究(2015BAK09B01

摘　　要：本文采用光滑粒子流体动力学(SPH)法对土质边坡稳定性及其失稳后的大变形进行数值模拟研究。该方法既可以分析边坡的稳定性系数和潜在滑移面,又可以对土质边坡失稳后的大变形过程进行模拟,从而弥补了传统数值模拟分析方法的不足,为土质边坡稳定性及失稳后滑坡大变形分析提供了一种新的方法。首先,采用Fortran语言编写了模拟土质边坡稳定性及失稳后滑坡大变形分析的SPH程序;其次,采用一个经典算例,验证了本文程序和方法在进行边坡稳定性分析时的准确性;最后,为验证该法模拟黏性土质边坡滑坡大变形的准确性,笔者自行设计了一组黏性土体滑坡大变形物理实验并与SPH模拟结果进行了对比。研究成果表明,基于弹塑性本构模型及D-P屈服准则的SPH方法可以较准确的模拟稳定性系数及潜在滑移面,并且可以较准确地模拟失稳后的滑坡大变形发展过程,弥补了目前数值模拟方法的不足,是一种值得推广的新型稳定性及滑坡大变形分析方法。In this paper,the stability and large deformation after failure of a soil slope were analyzed based on Smoothed Particle Hydrodynamics（ SPH）. This method can not only obtain the safety factor and the glide plane of slope,but also the flow state of the soli after failure can be simulated,and a new way for the analysis of soil stability and large deformation after failure were provided by this method. Firstly,the stability and large deformation procedure of SPH was written in Fortran language. Secondly,through a typical example,the validity of this procedure to calculate the stability of slope was analyzed. Finally,in order to verify the accuracy of this method in simulating the large deformation of soil slope after failure,a number of experiments based on cohesive soil were carried out and were compared with the numerical results. The good agreements obtained from these comparisons show that slope stability safety factor and glide plane can be successfully calculated by Strength Reduction method based on SPH,and the move process of slope after failure can also be simulated accurately,the new method is a promising way in slope analysis.

关 键 词：光滑粒子流体动力学 稳定性分析 D-P屈服准则 强度折减法 滑坡大变形 

分 类 号：O319.56[理学—一般力学与力学基础]