【摘要】 湖南省凤凰至大兴公路K0+500-K5+000段穿越碳酸盐岩区,据地面调查及钻探揭露,公路沿线发育溶洞,对区内岩溶地质环境进行了调查。选取典型溶洞,采用有限元稳定性分析方法对岩溶体稳定性进行分析,路堑开挖后产生的位移为1.2mm,最大主应力为6.3MPa,运营状态下静力荷载20kPa,通过计算溶洞在路堑开挖后和车辆荷载作用下位移场与应力场变化情况,认为溶洞是稳定的。更多还原

【Abstract】 Fenghuang-Daxing highway k0+500-k5+000 section passes through carbonate rocks zone.According to ground investigation and drilling exposition materials,the paper verifies the limestone cave situation and investigates the karst geological environment.In order to evaluate the stability of typical karst cave,a series of finite-element analysis method was done,as well as a conclusion was drawn that if cuts is excavated according to the standard,the maximum displacement should be 1.2mm.The maximum principal stress was 6.3MPa under the excavating condition and the maximum static load was 20KPa in cave periphery.Using the present method,the stability of No.10 karst cave was calculated and the feasibility of design was evaluated.更多还原