考虑预应力作用的土钉复合锚杆支护结构的稳定性分析  

Stability analysis of soil nail-anchor compound support structure with additional prestress

作　　者：王邓峮[1] 叶帅华[1] 朱彦鹏[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2015年第1期122-127,共6页Journal of Lanzhou University of Technology

基　　金：国家科技支撑计划项目(2011BAK12B07)

摘　　要：基于边坡圆弧滑动破坏,根据极限平衡理论和条分法,建立附加应力作用下边坡的稳定性分析模型.将锚杆预应力作为集中力考虑,估算预应力在支护边坡土体中引起的附加应力,从而将锚杆预应力的作用转化为了附加应力的作用.将土钉复合锚杆支护结构中锚杆和土钉的作用划分开来,在稳定性分析和计算中忽略锚杆附近一定范围内的土钉,作为安全储备;该范围以外土钉的作用在计算中予以考虑.该范围内的土体是受到预应力作用的土体,从而结合已有的土钉墙的稳定性分析方法和本文考虑预应力作用的锚杆支护边坡的稳定性分析方法,建立土钉复合锚杆支护边坡的稳定性分析模型,给出土钉复合锚杆支护边坡的安全系数计算公式.该方法同时考虑了锚杆的预应力作用和未受影响的土钉的作用,使得在土钉复合锚杆支护边坡的稳定性分析中能够给出定量结果.Aimed at the arc sliding destruction of the slope and based on the limit equilibrium theory and slice method,a stability analysis model was established for the slope subjected to the action of additional stress.The anchor prestress was considered as a concentrated force,the additional stress caused by prestress in the slope supported was estimated,so that the effect of anchor prestress was translated to that of additional stress.The effect of the anchor was separated from that of the soil nail.The nails at the neighborhood of the anchor was neglected in the analysis and computation of slope stability,making them a safety reserve.Out of the neighborhood,the existence of the soil nails was taken into consideration in the computation.The soil within the area of anchor neighborhood was subjected to the action of the prestress,so that the method available for stability analysis of soil-nail wall was combined with that presented in this paper for stability analysis of slope under action of prestress,to establish the stability analysis model of the slope with soil nail-anchor compound support and given out the computational formula of its safety factor.The effect of anchor prestress and unaffected soil nails were both considered in this method,so a quantitative result would be given in the stability analysis of the slope with soil nail-anchor compound support.

关 键 词：支护结构 土钉复合锚杆 附加应力 预应力 稳定性 

分 类 号：TU476[建筑科学—结构工程]