岩质高切坡预应力锚索超前支护研究.pdfVIP

第 卷第 期 Vol. No. 土 木 工 程 学 报 年 月 CHINA CIVIL ENGINEERING JOURNAL 岩质高切坡预应力锚索超前支护研究 何思明1,2 张晓曦3 欧阳朝军1,2 (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) 摘要：本文采用极限分析上限定理研究了遵循Hoek-Brown 强度准则岩质高切坡超前支护问题。首先研究了无支护岩 质高切坡的稳定性，给出了无支护岩质高切坡稳定计算方法。其次，分析了预应力锚索超前支护岩质高切坡的力学机 制，推导了相关计算公式和预加固荷载确定方法；最后分析了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。 关键词：岩质高切坡；极限分析；预应力锚索；屈服加速度 中图分类号： 文献标识码： 文章编号： Study on pre-stressed anchorage reinforced rock cut slope He Siming 1,2 Zhang XiaoXi 3 Ouyang Chaojun 1 (1. Key laboratory of Mountain Hazards and Surface Process, Chinese Academy of Science, Chengdu 610041,China ； 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041,China ； 3. Schoole of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China) Abstract : The kinematic approach of limit analysis is used to analyze the stability of rock cut slopes reinforced by pre-stressed anchorage with Hoek-Brown strength criterion. First, the case of rock cutting slope without reinforced is considered and a procedure is developed to calculate the safety factor for the slope. Then, the stability of rock cutting slopes reinforced with pre-stressed anchorage is analyzed. Expressions are derived allowing the force needed to increase the safety factor to a desired value .last, the yield acceleration and permanent displacement of reinforced rock slope with pre-stressed anchorage under seismic is investigated. A study is carried out to illustrate the effect of cut mode, strength parameters of rock slope on rock cutting slope stability Keywords : rock cut slope ；upper bound method ；pre-stress