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实践证明锚杆对边坡加固效果明显,但目前对地震作用下岩质边坡的锚固机制研究还不够深入,因此研究锚固边坡的抗震性能对于边坡锚固的优化设计具有重要意义。采用拟动力法模拟地震加速度时程曲线的输入,并基于极限分析上限定理推导地震作用下顺层岩质边坡临界无量纲总锚固力及锚固边坡稳定安全系数的表达式。通过算例对比分析锚杆倾角、节理面倾角、地震加速度影响系数、地震加速度放大系数、节理黏聚力与内摩擦角对边坡临界状态下总锚固力的影响。研究结果表明:边坡临界状态下锚固力与锚杆倾角、节理内摩擦角、水平向地震加速度影响系数及地震加速度放大系数正相关,与节理面倾角、竖向地震加速度影响系数及节理黏聚力负相关;随着节理内摩擦角的增大,水平向地震加速度影响系数及地震加速度放大系数对边坡临界状态下锚固力的影响越明显,而锚杆倾角、节理面倾角、竖向地震加速度影响系数及节理黏聚力的影响则逐渐减弱。
It has been proved by practice that the reinforcement effect of anchors to the slope is obvious. However, the research on the anchoring mechanism of rock slope under earthquake is still not deep enough. Therefore, studying the seismic performance of the anchored slope is of great significance to the optimal design of the slope anchorage. The quasi-dynamic method was used to simulate the input of the earthquake acceleration time history curve. Based on the upper bound theorem of limit analysis, the expression of the critical dimensionless total anchorage force and the stability safety factor of anchor slope under earthquake action were deduced. The effects of anchor inclination, joint inclination, seismic acceleration influence coefficient, seismic acceleration amplification factor, joint cohesion and internal friction angle on total anchorage force in critical condition of slope are analyzed and compared by examples. The results show that the anchoring force is positively correlated with the anchor angle, the internal friction angle, the horizontal seismic acceleration coefficient and the seismic acceleration amplification coefficient at the critical condition of the slope, and the influence factors of the joint inclination and the vertical seismic acceleration, With the increase of joint internal friction angle, the influence of horizontal earthquake acceleration factor and earthquake acceleration amplification factor on the anchoring force in the critical condition of slope is more obvious, while the inclination of anchor rod, the inclination of joint plane, the vertical earthquake The influence of acceleration influence coefficient and joint cohesion is gradually weakened.