花江北盘江大桥六枝岸高陡边坡稳定性评价

基于六枝岸边坡工程地质特征及可能出现的边坡变形破坏形式, 利用工程类比和经验方法初步确定边坡岩土体物理力学参数;采用极限平衡分析和三维有限差分方法分别分析了花江北盘江大桥六枝岸边坡的稳定性。结果表明, 各工况条件下, 二维、三维稳定性分析结果规律一致, 均满足边坡稳定性设计要求, 且有一定安全裕度;边坡各剖面的失稳模式基本以近似圆弧型整体失稳;相较于二维极限平衡法, 三维有限差分强度折减法计算得到的安全系数略大。

Stability Evaluation for High and Steep Slopes at Liuzhi Bank of Beipanjiang Bridge over Huajiang River

Based on the engineering geological characteristics of Liuzhi bank slope and the possible deformation and the forms of slope failure, the physical and mechanical parameters of the slope rock and soil were preliminarily determined by using engineering analogy and empirical methods. And the stability of Liuzhi bank slope of Beipanjiang Bridge over Huajiang River was also analyzed by using limit equilibrium analysis and three-dimensional finite difference method. The results show that the two-dimensional and three-dimensional stability analysis results are consistent under various working conditions, which all meet the requirements in the slope stability design with some margin of safety. The instability mode of each cross-section of the slope is basically a circular arc failure. In addition, compared with two-dimensional limit equilibrium method, the three-dimensional finite difference and strength reduction method can bring in a slightly higher safety factor.