边坡加固中预应力锚索失效机制与失效效应研究  

Research on failure mechanism and effects of prestressed anchor cables for reinforcing slopes

作　　者：李英勇[1,2] 张顶立[1] 张宏博[3] 宋修广[3] 

机构地区：[1]北京交通大学土建学院,北京100044 [2]山东省交通厅公路局,济南250002 [3]山东大学土建与水利学院,济南250061

出　　处：《岩土力学》2010年第1期144-150,157,共8页Rock and Soil Mechanics

摘　　要：预应力锚索已广泛应用于边坡加固工程中,由于其承受高拉应力作用,并长期埋置于潮湿的岩土环境中,在综合因素的作用下存在失效的可能性。结合实体工程中的大量监测数据,对预应力锚固系统长期稳定性的影响因素进行了深入分析,提出了预应力锚固系统的失效机制;为了分析锚索失效效应,确定合理的处理时机,分别进行了现场卸载试验及数值模拟,研究了单锚及群锚失效效应,提出了边坡局部失稳的判据,其结果可为类似工程提供借鉴。Although prestressed anchor cables have been used to reinforce slopes widely, they can happen to fail at some time because they have bear high-tension stress in moist environment and been influenced greatly by many external factors. In order to make sure of failure effects of anchorage system well, failure mechanisms are put forward firstly according to monitor data of an actual slope engineering. Then, unloading test of a cable at site was performed to get the influence on tension-force of neighboring cables. By adopting the numerical simulation, the influence on anchorage force of neighboring cables and stability of slope because of cable failure is analyzed in detail. Finally, failure criterion for part slope is put forward.

关 键 词：预应力锚固系统 失效机制 失效效应 失稳判据 

分 类 号：TU443[建筑科学—岩土工程]