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针对预应力锚索加固岩质边坡稳定性分析与评价问题,应用FLAC 3D建立了双滑面楔形体边坡模型,模拟了边坡边开挖、边锚固的施工过程及室内模型的超载破坏试验,分析了锚固岩体的位移和应力、节理裂隙面位移随工况的变化以及锚索预应力损失等问题.研究结果表明:预应力锚索加固作用提高了边坡整体的稳定性;分析边坡的整个破坏过程可知边坡的变化过程为柔性变化,而不是刚性变化;从锚索预应力变化情况可知锚索自上而下进入屈服状态,不同部位的锚索受力有先后、大小之分,呈不均匀分布;对锚固后边坡安全系数进行计算,计算结果与模型试验得出的结果相近.
Aiming at the stability analysis and evaluation of rock slope reinforced by prestressed cables, a double-wedge slope model is established by using FLAC 3D. The construction process of side slope excavation and side anchorage and the overload failure of indoor model are simulated The displacement and stress of anchored rock mass, the displacement of joint and fracture surface with working conditions and the loss of prestressing force of anchorage cable are analyzed.The results show that the reinforcement of prestressed anchorage cable enhances the overall stability of slope, The whole process of slope failure shows that the slope change process is a flexible change rather than a rigid change. According to the change of prestressing force, the anchor cable enters the yield state from top to bottom. Points are unevenly distributed; the safety factor of the slope after anchoring is calculated, and the calculation result is similar to that obtained by the model test.