基于流固耦合原理隧道穿越富水断层带设防长度研究  

Study on Tunnel through Water-rich Fault Fracture Zone Based on Solid-fluid Coupling

作　　者：张雨帆[1] 周佳媚[1] 周生波[1] 程毅 余乐[1] ZHANG Yu-fan;ZHOU Jia-mei;ZHOU Sheng-bo;CHENG Yi;YU Le(MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《铁道标准设计》2018年第8期111-116,共6页Railway Standard Design

基　　金：国家自然科学基金项目(51078319)

摘　　要：基于隧道渗流场的流固耦合原理,引入隧道穿越富水断层带设防长度概念,对隧道穿越富水断层带的加固范围进行研究。以广东揭阳某隧道穿越F2断层带开挖为依托工程,分析FLAC3D中内置的几种渗流模型在高富水断层带隧道开挖中应用的区别;通过数值模拟的方式,以隧道开挖后最终变形量及衬砌应力为控制标准,研究隧道穿越高富水断层带时的设防长度影响因素,并获得不同断层倾角下隧道穿越富水断层带时的设防长度。最终得出断层倾角小于42°的情况下,设防长度为1.5倍的隧道宽度。This paper conducts research on the reinforcing scope of the tunnel that passes through water-rich fault fracture zone based on the principle of fluid-solid coupling in tunnel＇s seepage filed and introduces the concept of fortification length. The subject investigated is the excavation of the tunnel through F2 fault zone at Jieyang in Guangdong Province. Firstly, the differences between several percolation models built into the FLAC3 D are analyzed when they are applied to the excavation in water-rich fault fracture zone. Then,the final deformation and lining stress of the tunnel in excavation completion stage are used as a control standard,and influencing factors of the fortification length of the tunnel through water-rich fault fracture zone are studied by means of numerical simulation. The fortification length of the tunnel passes through fault fracture zone with different dip angle is obtained. It is concluded that the fortification length is 1. 5 times of the length of the width of the tunnel,where the fault dip angle is less than 42 degree.

关 键 词：隧道 流固耦合 渗流模式 断层带 设防长度 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]