边坡预应力单锚索耐久性分析及其失效特性研究  

Study on Durability and Failure Characteristics of Single Prestressing Cable for Slope Engineering

作　　者：张思峰[1] 宋修广[2] 李艳梅[3] 李英勇[4] 

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东大学土建与水利学院,山东济南250061 [3]山东省环境保护科学研究设计院,山东济南250013 [4]山东省交通厅公路局,山东济南250002

出　　处：《公路交通科技》2011年第9期22-29,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51108252);山东省自然科学基金项目(ZR2010EQ030;Y2007F83);山东省优秀中青年科学家科研奖励基金项目(BS2009HZ012)

摘　　要：岩土预应力锚索被广泛应用于高边坡加固工程中,作为一种深埋于地下的高应力结构,其工作环境中存在着一些以水为载体的腐蚀性介质,加之张拉力的波动变化等因素影响,其自由段及内锚固段均存在着长期耐久性问题。基于实际边坡锚固工程预应力监测数据及室内试验成果,深入分析了影响预应力锚固结构长期耐久性的各种因素,并提出了可能影响其服役寿命的决定性因素。在此基础上,进行了单根锚索失效特性的现场试验及数值模拟研究,分析了单锚失效对岩土体位移场、应力场及邻近锚索张拉力的影响,研究成果可为在役锚固工程长期安全性控制对策的制定提供依据。Geotechnical prestressing cables have been widely used in reinforcement of high slopes.But as a kind of high stress structure buried under the ground in which there are some water contained corrosion mediums together with the fluctuation change of tensioning force,its free section and interior bond section exist long term durability problem.Based on a large amount of monitored data obtained from an actual high slope and laboratory test results,some factors that can influence the long term durability of geotechnical prestressed anchorage structures were analyzed,and the determinant factors that can affect its service life were also put forward.Then,the field test and numerical simulation of a single cable failure were carried out to analyze the influence of single cable failure on displacement field,stress field of peripheral rock-soil mass and tensioning force of neighboring cables.The research results can provide a basis for establishment of long-term safety control countermeasures of existing anchorage engineerings.

关 键 词：道路工程 耐久性 失效特性 现场试验 数值模拟 预应力锚索 

分 类 号：U416.14[交通运输工程—道路与铁道工程]