反倾岩质边坡块状倾倒破坏模式研究

Study on the Failure Mode of the Block Toppling of the Toppling Rock Slopes

反倾层状边坡受单一结构面切割时,边坡的破坏模式尚未十分明确。提出一种依据单个岩块的运动状态等效为整体边坡的破坏模式的方法,同时利用三维离散元软件3DEC进行边坡块状倾倒破坏的行为模拟,对所提出的方法进行验证。研究结果表明,边坡破坏模式可分为倾倒破坏、倾倒—滑移破坏和滑移破坏三类。通过13个算例对比分析发现,提出的分析方法其计算结果与3DEC软件给出的模拟结果有较好的一致性,说明了该方法的可行性。深入分析了岩层倾角α、底滑面倾角β以及剪出口高度H与岩层厚度t比值(即H/t)的变化对边坡破坏模式的影响。

When a toppling rock slope was cut by a single structural plane, the failure mechanism had not been clearly clarified yet. A method that the movement of a single rock block was equivalent to the failure mode of the whole slope was proposed. At the same time, the behavior simulation was carried out on the block toppling of the slope by using the three-dimensional discrete element software 3DEC, so as to validate the proposed method. The results showed that the failure mode of the slope could be divided into three categories including toppling, toppling-sliding and sliding. By analysis on the 13 examples, the results showed that the proposed method was consistent with the simulation results given by 3DEC software, which further illustrated the feasibility of the proposed method. Furthermore, the influences of dip angle α,dip angle of dip structure β, as well as the ratio of cutting height H and rock thickness t （H/t） on the failure mode of the slope were deeply analyzed.