岩质高切坡预应力锚索超前支护研究  

Research of rock high cut slope reinforced by pre-stressed anchorage

作　　者：何思明[1,2] 张晓曦[3] 欧阳朝军[1,2] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《土木工程学报》2011年第12期101-107,共7页China Civil Engineering Journal

基　　金：科技部科技支撑计划(2011BAK12B03);国家自然科学基金(40872181);交通部西部科技项目(2008-318-792-85)

摘　　要：采用极限分析上限定理研究遵循Hoek-Brown强度准则岩质高切坡超前支护问题。首先研究无支护岩质高切坡的稳定性,给出无支护岩质高切坡稳定计算方法;其次,分析预应力锚索超前支护岩质高切坡的力学机制,推导相关计算公式和预加固荷载确定方法;最后分析加固岩质高切坡在地震荷载下的临界屈服加速度及其永久位移。揭示了开挖方式、强度参数对预应力锚索加固岩质高切坡的影响。A kinematic approach of limit analysis with Hock-Brown strength criterion is employed to analyze the stability of rock cut slopes reinforced by pre-stressed anchorage. First, the case of rock cut slope without reinforcement is considered and a procedure is developed to calculate the safety factor for the slope. Then, the stability of rock cut slopes reinforced with pre-stressed anchorage is analyzed. Expressions are derived for the force needed to increase the safety factor to a desired value. The yield acceleration and permanent displacement of reinforced rock slope with pre-stressed anchorage under seismic action is investigated. A study is carried out to illustrate the effects of cut mode and strength parameters of rock slopes on rock cut slope stability.

关 键 词：岩质高切坡 极限分析 预应力锚索 屈服加速度 

分 类 号：TU433[建筑科学—岩土工程]