顺层高边坡双平面破坏分析方法研究

为了准确便捷地开展边坡破坏的评价分析,首先基于顺层高边坡双平面滑动机理建立了双平面滑体模型,然后根据极限平衡原理提出了边坡稳定性分析方法,最后采用离散元数值模拟和所提理论方法开展了典型顺层高边坡双平面破坏的对比分析。结果表明:理论方法与数值模拟计算所得边坡安全系数和滑体厚度近似一致;顺层高边坡双平面滑体可分为上部主动块和坡脚被动块,在主动块对被动块的挤压推力作用下,层理和缓倾节理相互贯通,形成双平面滑动面,发生双平面滑动破坏;边坡安全系数随滑体厚度增加而先减小后增加,存在一个最小安全系数对应的最危险滑体厚度。

Study on Analytical Method of Bedding High Slopes Against Bi-planar Failure

In order to carry out the evaluation and analysis of this type of slope failure accurately and conveniently, the bi-planar sliding model of the bedding high slopes was firstly established based on the bi-planar sliding mechanism. An analytical method of such slopes was then proposed according to the limit equilibrium theory. Finally, the comparative analysis of typical bi-planar failure of bedding high slopes was carried out using discrete element numerical simulation and the proposed theoretical method. The results show that:the theoretical analysis method is in approximate agreement with the safety factor of the slope and the thickness of the sliding body obtained from the numerical simulation. The bi-planar sliding body of the bedding high slope can be divided into the upper active block and the passive block at the toe of the slope. Under the thrust of the active block on the passive block, the bedding and gently joints penetrate each other to form a bi-planar sliding surface, and thus bi-planar sliding failure occurs. The safety factor of the slope decreases and then increases as the thickness of the sliding body increases, and there exists a most dangerous thickness of the sliding body corresponding to the minimum safety factor.