土钉支护基坑抗隆起稳定性计算方法研究  

Estimating basal heave stability for soil nailed excavations

作　　者：朱磊[1] 龚晓南[1] 邢伟[2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,杭州310027 [2]国核电力规划设计研究院,北京100094

出　　处：《岩土力学》2012年第1期167-170,178,共5页Rock and Soil Mechanics

摘　　要：以基坑隆起破坏的根本原因是地基承载力不足为前提,运用Terzaghi地基极限承载力理论,推导了土钉支护条件下基坑抗隆起稳定性的计算方法。采用地基土单侧滑动失稳破坏假设,同时考虑了单侧滑动体上竖向抗剪力对抵抗基坑隆起所起的作用。通过基本算例,对影响基坑抗隆起稳定性的参数进行了讨论,并得出了各抗隆起安全系数与各因素之间的部分变化规律。与现有的基坑抗隆起稳定性计算方法对比分析表明,所建议的方法在实际工程应用中是可行的。The basal stability of soil nailed excavation systems has been investigated using Terzaghi＇s ultimate bearing capacity theory; and a simplified procedure is proposed for estimating basal heave stability. It is assumed that the basal heave failure is caused by bearing capacity failure; but only part of the failure surface presented in Terzaghi＇s bearing capacity is mobilized to evoke basal heave failure. The important factors affecting basal stability have been identified; and correlations between them and factor of safety are discussed from the results of parametric studies. Comparison with other methods has shown that the method proposed is more reliable to estimate basal heave stability.

关 键 词：土钉支护 抗隆起稳定性 地基承载力系数 参数分析 

分 类 号：TU470[建筑科学—结构工程]