基于3DEC的岩质边坡倾倒破坏稳定性分析

Stability Analysis on the Reclining Failure of Rock Slope Using 3DEC Method

倾倒变形是河谷地区层状岩质边坡失稳的一种典型变形破坏模式。为解决倾倒破坏的稳定性问题,利用3DEC软件在分析块体的运动和变形方面的优势,探讨岩质边坡倾倒破坏失稳动态过程及边坡变形破坏趋势,分析变形破坏关键区域对整个边坡失稳的影响,根据破坏机理进行稳定性分析判断,为治理设计提供依据。实例应用表明,该方法可以直观地模拟倾倒破坏的块体变形和运动特点;数值模拟结果表明,坡面第二级拉裂倾倒区域为变形破坏的关键区域,如继续发展将与后缘沉降区域贯通,边坡将进入失稳破坏阶段。

The reclining deformation is a typical deformation damage form for the instability of layered rock slope in the valley area.In order to rationally evaluate the stability of reclining failure in rock slope,the dynamic characteristics and reaction of blocks in rock mass failure and the deformation failure trend of the slope are modeled using 3DEC method.The effect of the key region on the contiguous blocks in the deformation failure is analyzed.Therefore,the stability of the slope is evaluated by the failure mechanism,which in turn provides useful input for slope design.A case study shows that it is an intuitional method to simulate blocks deformation and dynamic movement.The results of numerical simulation indicate that the region in the secondary slope is the key area in the reclining failure.As the deformation continues,the key region and the settling area in the rear will be through cut,which means that the slope goes into the instability failure stage.Accordingly,it is an effective method to evaluate the reclining failure of rock slope,which offers data and measures for slope design.