【摘要】 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。更多还原

【Abstract】 Anchoring technology has played an important role in slope reinforcements in engineering practice. However,the failure mechanism of anchored slopes subjected to seismic loads is not fully understood at present. Therefore,the study of dynamic behavior of anchored slopes is of great significance for the optimal design of slope reinforcements. In this paper,the pseudo-dynamic method is used to simulate the input of acceleration-time history. Based on the upper bound theorem of limit analysis,the mathematical expressions of the required reinforcement force when the layered rock slope under seismic loads is in critical status and the factor of safety of it are then deduced. Finally,the parametric studies on the influence of the dip angle of bolt,the dip angle of joint surface,seismic acceleration coefficients,seismic amplification factor,joint cohesion,joint friction angle on the required reinforcement force when the slope is in critical status are discussed. The results indicate that the stability of layered rock slope is influenced to some extents by all the parameters mentioned above. In addition,with the increase of joint friction angle,the horizontal seismic acceleration coefficient and seismic amplification factor have greater effects on the required reinforcement force,while the dip angle of bolt,the dip angle of joint surface,the vertical seismic acceleration coefficient and joint cohesion have less influence on it.更多还原