双向锚固岩石边坡抗滑稳定性拟静力分析

锚索加固是岩石边坡常用的支护措施,研究极端条件下加锚岩石边坡的稳定性,提出稳定性分析方法和控制手段是工程界迫切解决的问题。本文基于极限平衡理论,综合考虑冻胀力、水力条件、坡顶超载、地震荷载和多向锚固效应对岩石边坡的影响,建立了极端条件下双向锚固岩质边坡抗滑稳定分析计算模型,并重点分析了几种相关参数组合对岩石边坡抗滑稳定性的影响。计算结果表明:拉裂缝积水、冻胀力、出流缝被堵塞和超载不利于岩石边坡稳定性,安全系数随冻深、张裂缝积水、坡顶超载的增大而减小;而锚固效应及较小的锚固角则对抗滑有积极作用。工程设计中需合理考虑最不利荷载组合,且冻胀力的影响不容忽视。

Quasi-static Analysis of Seismic Stability of Double-directional Anchored Rock Slope under Extreme Conditions

Rock anchoring is one of the common methods of rock slope stabilization. The stability analysis and control manners of the stability of anchored rock slope under extreme conditions are generally an indeterminate problem in rock engineering. Based on the limit equilibrium method, a new computational model for evaluating anti-seismic stability of double-directional anchored rock slope under extreme conditions is presented after taking the frost-heave force, hydraulic condition, surcharge, seismic force and supporting effect of rock-bolts into consideration. The influence of combination of several related parameters on anti-seismic stability of rock slope was analyzed. Parametric analysis has shown that the water in tension crack, frost-heave force, blocked outflow fissure and surcharge have a disadvantage effect on the rock slope stability. The safety factor would be lowered with increase of depth of frost, water in crack and surcharge; the anchorage effect and small anchoring angle have an advantageous effect on the rock slope stability. In engineering design the unfavorable combination of loading should be properly considered and the frost heave should not be neglected.