高水压富水山岭隧道设计浅谈及工程实例

通过对地下水渗流场的理论分析,结合宜万线齐岳山隧道高水压富水地段现场具体处理情况,得出高水压富水隧道设计应注意的主要原则:"以堵为主,限量排放"是高水位富水隧道设计应遵循的基本原则,限量标准应根据隧道区域内具体情况类比确定;地层注浆是实现限量排放的主要方式,确定注浆加固圈范围时应确保注浆帷幕体自身的稳定;排水系统是衬砌结构设计中不可缺少的一部分,在完善可靠的排水系统下,衬砌结构承受的外水荷载能较大幅度地进行折减。

Discussion on the design of water - soaked mountain tunnels with high water pressure

Based on the theoretical analysis of the flow field of ground water and through the practice of Qiyueshan tunnel with high water pressure and water-soaked sections,several main principles about the design of this kind of tunnels are proposed:the main principle is "taking water-stopping precedence over limited discharge",the standard of the limited discharge is defined by analogy according to the concrete tunnel situation;curtain grouting is the main measure for the limited discharge;the stability of the grouted rock mass is ensured by properly determining the extent of grouted area;the drainage system is an essential part of the lining structure;under reliable design of drainage system,external water pressure acting on the lining structure can be reduced to a large extent.