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针对光滑粒子流体动力学方法(SPH)在滑坡模拟中建立粒子模型的难题,提出了基于地理信息系统(GIS)栅格数据的粒子排列与插入方法。根据该方法,建立了滑坡SPH粒子模型及相关粒子生成程序,进一步以结合摩尔-库仑破坏准则的SPH宾汉流体模型为核心,实现了运用SPH方法模拟滑坡破坏后三维运动的过程。该SPH模型在对唐家山滑坡的模拟中得到了验证,并预测了金坪子滑坡破坏后的影响范围。结果表明:基于GIS空间数据的滑坡SPH粒子模型具有可行性与良好的适用性。以GIS数据库为基础,开展滑坡灾害的模拟研究,将大大提高对滑坡等地质灾害的仿真分析,为滑坡灾害的预测与防治提供参考。
Aiming at the difficulty of establishing the particle model in the landslide simulation using the smooth particle hydrodynamics method (SPH), a particle array and insertion method based on the grid data of GIS is proposed. According to this method, the SPH particle model of landslide and related particle generation program are established. Based on the SPH Binham fluid model combined with the Mohr-Coulomb failure criterion, the SPH method is used to simulate the three-dimensional motion of the landslide. The SPH model is validated in the simulation of Tangjiashan landslide and predicts the impact of the Jinpingzi landslide. The results show that the landslide SPH particle model based on GIS spatial data is feasible and well applicable. Based on the GIS database, the simulation study of landslide disaster will greatly enhance the simulation analysis of landslides and other geological disasters, and provide reference for the landslide hazard prediction and prevention.