预应力锚索加固土质边坡的稳定性极限分析
Stability Analysis of Slopes Reinforced with Pre-tensioned Cables by Limit Analysis Method
作者：李新坡(中国科学院 成都山地灾害与环境研究所，四川 成都 610041)；何思明(中国科学院 成都山地灾害与环境研究所，四川 成都 610041)；徐骏(中国科学院 成都山地灾害与环境研究所，四川 成都 610041)
Author：(Inst. of Mountain Hazards and Environment, Chinese Academy of Sci., Chengdu 610041,China)；(Inst. of Mountain Hazards and Environment, Chinese Academy of Sci., Chengdu 610041,China)；(Inst. of Mountain Hazards and Environment, Chinese Academy of Sci., Chengdu 610041,China)
收稿日期：2005-09-09 年卷（期）页码：2006,38(5):82-85
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：边坡稳定性;预应力锚索;极限分析;强度折减法
Key words：slope stability; pre-tensioned cable; limit analysis;shear strength reduction technique
基金项目：中国科学院知识创新工程重要方向资助项目（KZCX2-306）
中文摘要
预应力锚索在边坡工程中应用广泛。针对预应力锚索加固边坡的稳定性分析问题，基于极限分析上限定理，把锚索锚固作用简化为边坡表面上的外力，推导了预应力锚索加固土质边坡的安全系数计算公式，计算结果合理。锚索的作用后改变了边坡临界破坏面的位置，如果不予考虑计算结果将偏于危险。根据分析结果，锚索可以有效地提高边坡的稳定性，锚索的最有效作用位置在边坡中部到坡脚附近。
英文摘要
Pre-tensioned cables have been extensively used to reinforce soil and rock slopes. In this paper, the kinematic approach of limit analysis is used to analyse the stability of soil slopes reinforced with pre tensioned cables. The action of a cable is simplified as a force acting on the surface of slope, and formulas are derived to calculate the safety factor of cable reinforced slope. The presence of cable changes the critical surface of reinforced slope. The assumption that the critical surface does not change with the addition of the cable would lead to non-conservative results for the factor of safety. According to analysis results, the most suitable location of the cable within the slope is near the slope toe.
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