基于矢量和法的加筋土边坡动力稳定性分析

Dynamic Stability Analysis of Reinforced Soil Slope Based on Vector Sum Method

对于地震作用下的加筋土边坡工程,考虑到传统加筋土边坡稳定性分析方法有一定的局限性,在已有的理论基础上,将矢量和法运用到加筋土边坡的动力稳定性分析上,同时对加筋土边坡工程动力稳定性影响因素进行了敏感性分析。建立二维加筋土边坡数值模型,将基于最大剪应变增量的边坡滑动面搜索方法运用到加筋土边坡动力稳定性分析的矢量和方法中,对模型进行动力稳定性分析,并通过合理的计算优化,提高了加筋土边坡的动力稳定性分析的计算效率。结果表明,矢量和方法在加筋土边坡的动力稳定性分析中是合理并且高效的;在地震作用下的加筋土边坡工程中,对动力稳定性影响较大的是地震荷载、加筋土边坡的填土黏聚力、内摩擦角以及加筋材料的耦合弹簧切向刚度。因此在加筋土边坡的抗震设计中,需要重点考虑采用黏聚力和内摩擦角较大的填土和切向刚度较大的加筋材料。

For the reinforced soil slope project under the action of earthquake, it is considered that the traditional stability analysis method of reinforced soil slope has certain limitations. On the basis of existing theories, the vector sum method is applied into the dynamic stability analysis of reinforced soil slope, and the sensitivity analysis is conducted for the dynamic stability influencing factor of reinforced soil slope project. A two-dimensional reinforced soil slope numerical model is established, and the slope sliding surface searching method based on the maximum shearing strain increment is applied into the vector sum method of dynamic stability analysis of reinforced soil slope to conduct the dynamic stability analysis of the model. And the reasonable calculation optimization can improve the calculation efficiency of dynamic stability analysis of reinforced soil slope. The result shows that the vector sum method is reasonable and efficient in the dynamic stability analysis of reinforced soil slope. The greater influences on the dynamic stability are the earthquake load, filling cohesion and internal friction angle of reinforced soil slope, and coupling spring shear stiffness of reinforced material in the reinforced soil slope project under the action of earthquake. Therefore, the emphasisshould be placed to use the greater cohesion and internal friction angle of filling and the greater shear stiffness of reinforced material in the earthquake resistant design of reinforced soil slope.