土钉支护内部整体稳定性c-φ-τ强度折减法  

c-φ-τstrength reduction method for internal stability of soil nailing

作　　者：郭红仙[1] 宋二祥[1] 陈肇元[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《岩土工程学报》2008年第S1期187-191,共5页Chinese Journal of Geotechnical Engineering

摘　　要：比较了土钉支护与纯土坡在稳定分析方面的不同。结合土钉支护边开挖边支护的特点,分析了施工阶段土钉轴力增量与土钉支护内部整体稳定性的关系,给出了c-ψ-τ强度折减法计算土钉支护内部整体稳定性安全系数的方法,该方法除考虑一般土坡稳定分析中对c及ψ的降低外,还考虑土钉工作内力的变化及其对抗滑的贡献,以及钉土之间相互作用程度的降低。采用该方法,对Clouterre项目1号墙浸水破坏时的内部稳定安全系数进行了计算,计算结果与TALREN程序一致。分析表明,c-ψ-τ强度折减法可用于计算土钉支护施工阶段、使用阶段和破坏阶段的内部整体稳定性安全系数。The difference of internal stability analyses between soil slope and soil nailing was addressed.The relationship between the soil nail incremental tensile forces and the internal stability during the construction prdcess was discussed by considering the construction features of soil nailing.The c -φ-τstrength reduction method to calculate the safety factor of internal stability was proposed.In this method,the authors not only considered the c and the strength-reduction,as the same as the stability analysis of soil slopes,but also considered the change of the nail internal forces and their contribution to the resistance slide force,and also considered the reduction of the interaction of soil and nails.The safety factor of internal stability calculated by the c -φ-τstrength reduction method for Experiment 1(Clouterre Program) was in agreement with the safety factor by TALREN Program.Analyses show that the c -φ-τstrength reduction method can be used to calculate the safety factor of internal stability of soil nailing during the construction process,in service and in failure condition.

关 键 词：土钉支护 内部整体稳定性 土钉力 安全系数 c-φ-τ强度折减法 

分 类 号：TU476[建筑科学—结构工程]