边坡抗滑桩加固的三维有限元计算

3D finite element computations for slope reinforcement with anti-slide piles

摘要:

本文以王山村滑坡为研究对象，围绕其工程中静力抗滑稳定问题，通过室内试验对影响王山村滑坡稳定性的地质构造、场地工程条件等内在因素进行分析评价。在此基础上，利用大型商业软件ABAQUS对边坡抗滑桩加固模型进行有限元计算分析。通过对加固在边坡模型底部、中部及上部3个常见桩位稳定性系数的计算，得到了3个桩位的稳定性系数。计算结果表明：加固在模型中部桩位的安全系数最高，为1.58。为综合考虑静力作用下坡脚应力集中及动力作用下的坡顶加速度放大效应，设计了加固在边坡中点附近的上部桩位和下部桩位，并分别对其稳定性进行求解，计算结果显示两种桩位都具有较高的安全系数，分别为1.35和1.56。最后通过对模型坡面上5种桩位安全系数的对比，验证了上部桩及下部桩的可行性，可作为工程实践的参考方案。

关键词:抗滑桩;三维有限元方法;安全系数

Abstract:

With the Wangshan Village landslide as study subject, and with regard to the static anti-sliding stability in the project, indoor and field tests were conducted to analyze and evaluate the intrinsic factors affecting the stability of the Wangshan Village landslide, such as geological structures and site engineering conditions. The commercial software ABAQUS was used then to compute the model for slope reinforcement with anti-slide piles. The safety factors for the bottom pile, middle pile and top pile on the slope have been calculated and obtained. The calculation results show that the middle pile has the highest safety factor with 1.58. In view of the stress concentration at the foot of the slope under the static load and the acceleration amplification effect at the top of the slope under the dynamic load, the upper pile position and the lower pile position were designed around the middle of the slope, and the safety factors of two new positions were calculated. The results show that the safety factors of two positions are fairly high. Finally, comparison of the safety factors of five different pile positions on the slope has verified the feasibility of the upper pile and the lower pile, and the results can be taken as reference for the engineering works.

Key words:anti-slide pile; 3D finite element; safety factor