基于光滑粒子法边坡失稳影响范围的模拟

基于光滑粒子流体动力学(SPH,smoothed particle hydrodynamics),以经典弹塑性本构模型为核心,结合一系列数值处理方法,探讨精确和便捷地对边坡失稳破坏影响范围的模拟方法与技术。文中借助地理信息系统(geographic information system,GIS)平台与C#编程建模,将边坡地形细节与特征创建成为SPH粒子,对模型部分边界粒子排列方式进行改进,最后应用到边坡模拟的实例中。结合GIS平台与Matlab开发了滑坡SPH粒子自动排列程序,将此模型与方法应用在美国华盛顿州Oso滑坡实例中,经过参照对比,数值模拟结果与滑坡现场收集数据较为吻合,验证了光滑粒子法及运动模型在模拟边坡失稳影响范围的适用性。

Modeling of influenced area after slope failure based on smoothed particle hydrodynamics (SPH)

The modeling of the influence scope after slope failure is one of the important approaches to quantify the risk of landslide hazard. In this paper, based on the Smoothed Particle Hydrodynamics (SPH) method, the classical elastoplastic constitutive model was employed to study the application of a more accurate and convenient method to simulate the influence scope of slope failure with a series of numerical treatments. Geographic Information System (GIS) platform and C# programming were adopted to build the model of the terrain details and features of the slope using SPH particles. At the same time the arrangement of boundary particles in the model were improved. Finally, a program that can automatically generate the data of landslide particles for calculation and simulation was completed. The model and method were applied to the Oso landslide case in Washington state, USA and the simulation results were basically consistent with the data collected from the field.It is verified that the SPH method and the model can be used to simulate the process and influence scope of slope failure.