摘要
预应力锚索是治理高边坡稳定性的极为有效的方法。然而在边坡稳定性有限元分析中,往往会发现预应力锚索加固效果并不如实际情况下有效。造成这一现象是由于现有的预应力锚索的模拟方法没有很好地反映出锚索的工作机制,预应力锚索对于岩体不仅有应力贡献还具有刚度贡献,而且两者的发挥时机是不同的。通过评述现有各种预应力锚固模拟方法,分析对比了各方法的优缺点,介绍了在近年几十个边坡工程咨询工作中逐步完善起来的预应力锚固模拟的一系列改进措施,并提出了一套能够对锚索张拉、锁定、回灌等工序进行全过程仿真的新型锚索单元及其相应模拟新方法。最后结合锦屏一级水电站左岸坝肩边坡实例,给出了原有方法与改进方法之间对比例证。
Prestressed anchor cable have been widely used as a main reinforcement method in geotechnical engineering,and its effective reinforcement capabilities have been validated by many project cases.However,for the existing method of numerical simulation of prestressed anchor cable in slope has some disadvantages,the result of numerical simulation in FEM isn′t in accord with practical one.This paper tries to discuss these disadvantages about the existing method of numerical simulation of prestressed anchor cable in slope and put forward a series of measures.Then,the authors suggest a new method of numerical simulation of prestressed anchor cable in slope which will simulate the whole process in construction and operation period.At last,the abutment slope in Jinping Hydroelectrical Project illustrates the difference between the existing method and the proposed method.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2007年第2期254-261,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点资助项目(50479023)
高等学校博士学科点专项科研基金项目(2004070008)
关键词
岩石力学
边坡工程
预应力锚索
数值模拟
rock mechanics
slope engineering
prestressed anchor cable
numerical simulation
