地震作用下复合土钉支护边坡稳定性模型及应用  

Stability model of slope supported by composite soil nailing wall and its application under earthquake

作　　者：朱彦鹏[1] 马天忠[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2009年第5期112-115,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省科技厅攻关项目(2GS064-A52-040)

摘　　要：在考虑复合土钉支护结构与土体协同工作的情况下,根据土质边坡的破坏模式,考虑预应力锚杆中施加的预应力对稳定性计算的影响,根据极限平衡理论建立复合土钉支护边坡地震稳定性分析模型.推导计算机搜索法的边坡复合土钉支护滑移面动态搜索模式,实现随着复合土钉设计参数变化的复合土钉支护稳定性动态分析过程.较好地解决了地震作用下复合土钉支护结构稳定性分析问题.编制复合土钉支护边坡动力稳定性分析程序,结合具体工程实例进行验算.结果表明这种稳定性分析模型能够较准确地确定复合土钉支护边坡的最危险滑移面及其对应的稳定系数,具有较高的可靠度;该计算方法对土质较均匀的黄土地区是适用的.Taking into consideration the coordinated work of composite soil nail supporting structure with soil body and according to failure mode of soil slope, the seismic stability analysis model for composite soil nail supported slope was established by using limiting equilibrium theory, in which the influence of pre- stress in anchor on stability analysis was considered. The dynamic search pattern of slipping surface of composite soil nail supported slope was derived with computer searching, so that the dynamical analytical process of stability of composite soil nail supporting structure was realized in the case of changeable design parameters of composite soil nails. Therefore the stability analysis problem of composite soil nail supporting structure was well solved. Finally, the dynamical stability analysis program for composite soil nail supported slope was developed. The method was checked with an actual engineering case. The result showed that this model of stability analyses could be used to determine accurately the most dangerous slip surface in composite soil nail supported slope and the corresponding stability coefficient, exhibiting a higher reliability. This method was appropriate to be used for loess area with uniform soil.

关 键 词：复合土钉 边坡稳定性 地震作用 极限平衡理论 拟静力法 

分 类 号：TU432[建筑科学—岩土工程] TU753.7[建筑科学—土工工程]