网格划分对边坡稳定有限元分析的影响

The Effect of the Mesh on the FEM Analysis of Slope Stability

网格划分对边坡稳定性有限元分析的准确性有很大影响,而目前对此影响的研究相对不够。以有限元强度折减法在边坡稳定性分析中的一标准算例为依据,探讨ABAQUS中网格划分技术、网格形状、网格密度、局部加密网格、网格生成算法和单元积分方法对边坡稳定性计算的影响。最后用一复杂土坡案例分析以上诸因素对边坡稳定性分析的敏感性,得出在适当范围内加密网格可节约计算时间,二次积分单元计算精度高但更耗成本等结论,对边坡稳定分析的网格划分具有一定参考价值。

Meshing has great impact on the accuracy of the FEM analysis of slope stability ,but its research is currently insufficient .By employing ABAQUS and on the basis of an standard calculation example of slope stability which was ana-lyzed by FEM Shear Strength Reduction Method ,the effects of meshing techniques ,mesh shapes ,mesh density ,partial-ly-refined mesh ,mesh algorithm and element integration on account of slope stability were investigated .At last ,the ef-fects of above factors on the sensitivity of slope stability were analyzed on a complex soil slope .the results indicate that the increase of the refinement of the mesh in proper regions can reduce computing time ,quadratic integration element method has higher calculation accuracy but with larger computational expense and so on .These findings have a certain reference value for the meshing of the analysis of slope stability .