公路岩质边坡稳定性评价的能量法研究  

Study on Energy Method for Estimation of Highway Rock Slope Stability

作　　者：王根龙[1,2] 张军慧[1] 李巨文[1] 常中华[2] 苏天明[3] 

机构地区：[1]中国地震局防灾科技学院,河北三河065201 [2]中国科学院地质与地球物理研究所,北京100029 [3]交通部公路科学研究院,北京100088

出　　处：《公路交通科技》2009年第12期1-6,16,共7页Journal of Highway and Transportation Research and Development

基　　金：中国博士后科学基金资助项目(20090450565);交通部西部交通建设科技项目(200831822353);防灾减灾青年科技基金资助项目(2008A10);三峡库区三期地质灾害防治高切坡防护工程科研项目(2008SXG01-5)

摘　　要：针对公路岩质边坡稳定性分析评价问题,根据能量法原理和塑性极限分析上限定理,建立了岩质边坡平面滑动的屈服机构。在刚塑性假定条件下,视岩质边坡的滑体为刚体,没有内能耗散,视滑面为塑性区,能量耗散主要集中在滑面上,根据能量法可以得到简化后的虚功率方程。综合考虑作用在岩质边坡上的后缘裂缝静水压力、沿滑面扬压力、重力、水平地震惯性力、锚固力等外力,按照强度折减法,推导得出了公路岩质边坡稳定性评价的能量法上限解。通过典型算例,将能量法上限解和刚体极限平衡法稳定系数计算结果进行了对比分析。Aimed at stability analysis and evaluation for highway rock slope, based on the theory of energy method and the upper bound theorem of plasticity limit analysis, a yield mechanism of planar failure surface for rock slope was established. On the assumption that the sliding mass of rock slope was treated as rigid body without internal energy dissipation while the sliding surface was treated as plastic zone where the energy dissipation mainly generates, the simplified virtual power equation in limit state was obtained by using energy method. With consideration of the hydrostatic pressure in back fissure, uplift pressure along slip surface, self-weight, horizontal seismic inertia force and anchorage force, the upper bound solution of energy method for highway rock slope stability analysis was deduced by means of strength reduction method. Through a typical case study, the computation results between the presented method and rigid body limit equilibrium method was compared.

关 键 词：道路工程 上限解 能量法 岩质边坡 稳定系数 

分 类 号：TD853.34[矿业工程—金属矿开采]