【摘要】 《水工隧洞设计规范》(SL279—2002)推荐根据地下水活动状态确定外水压力折减系数,这种方法在水利行业已延续使用了几十年,存在前期勘察阶段使用困难的问题。提出在隧洞工程前期勘察设计阶段可根据岩体渗透性确定外水压力折减系数;施工阶段根据地下水溢出状态确定外水压力折减系数,并对前期成果进行验证和修正。更多还原

【Abstract】 It is recommended in 《The Design Specification of Structure Tunnel》(SL279—2002) that the reduction factor of external water pressure is determined according to the moving state of underground water and this method is lasted for many years in water conservancy field and the problem of using difficultly in fore-stage investigation stage is existed.It is suggested in this paper that the reduction factor of external water pressure can be determined according to the permeability of rock mass in fore-stage investigation and design stage for tunnel projects. During the construction stage,the reduction parameter of external water pressure can be determined according to the exit state of underground water and the fore-stage results must be verified and revised.更多还原