基于SPH法的九寨沟滑坡模拟研究

Simulation study of Jiuzhaigou landslide based on SPH method

为了提高有限元法在解决滑坡较大变形时网格畸变的计算效率和精度,以九寨沟区域滑坡处地层土壤材料参数为基础,采用SPH法建立边坡模型,通过改变粒子密度和瑞利阻尼参数,研究了九寨沟区域滑坡的缩尺斜面模型滑坡面发生状况,比较了不同参数下滑动面产生过程中的差异。结果表明,在应用SPH法分析地震边坡变形的过程中,平滑距离的调整易使计算精度发生变化,从而产生一定程度的误差,而平滑距离也会影响边坡的最终变形形态;在不同的SPH粒子密度和不同的瑞利阻尼参数下,滑动面的产生过程也呈现出显著差异。SPH法有效改善了有限元处理大变形时网格失真等问题,研究结果可为地质灾害易发区的滑坡灾害防治提供一定参考。

In order to improve the calculation efficiency and accuracy of the finite element method in solving mesh distortion of large landslide deformation,based on the soil materials parameters of the landslides in the Jiuzhaigou area,the SPH method was utilized to establish the slope model.By changing the particle density and Rayleigh damping parameters,the landslide surface occurrence of the scaled slope model of Jiuzhaigou lanolslides was studied and the differences in the sliding surface generation process under different parameters were analyzed.The results show that in the analysis of seismic slope deformation by SPH method,the calculation accuracy is easy to change when adjusting the smoothing distance,which results in a certain degree of error,and the final deformation of the slope can be affected by the smoothing distance.With the different SPH particle densities and Rayleigh damping parameters,the generation process of the sliding surface also shows significant differences.SPH method can improve the mesh distortion of large deformation by finite element method,and the results of this study can provide a reference for landslide diaster prevention and control in other geological disaster prone areas.