富水岩溶隧道隧底排水适应性研究与应用  

Adaptability Research of Drainage at Bottom of Water⁃Rich Karst Tunnel and Its Application

作　　者：包德勇[1,2] BAO Deyong(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China;National-local Jonit Engineering Research Center of Underwater Tunnelling Technology,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]水下隧道技术国家地方联合工程研究中心,武汉430063

出　　处：《铁道建筑》2023年第5期100-104,共5页Railway Engineering

摘　　要：以武九客运专线(武汉—九江)石马寨富水岩溶隧道为工程依托,通过数值模拟分析了仰拱下设置中心排水沟、仰拱填充层内设置中心排水沟两种排水方式下地下水渗流场、衬砌水压力分布规律和隧道结构受力特征。结果表明:仰拱下设置中心排水沟时因排水沟与排水孔共同排水,可明显减小隧底围岩孔隙水压力,仰拱承担的水压力较小,在高压富水条件下可有效降低仰拱隆起、翻浆冒泥等风险;与仰拱填充层内设置中心排水沟相比,仰拱下设置中心排水沟时仰拱中心处弯矩显著减小,边墙、仰拱部位安全系数明显增大,仰拱填充层与仰拱协同受力,隧底结构整体性增强。现场应用结果表明,仰拱下设置中心排水沟虽工序稍复杂,但防排水效果好,可在富水岩溶隧道中推广应用。Based on the water-rich karst tunnel in Shimazhai of Wuhan-Jiujiang Passenger Dedicated Line,the seepage field of groundwater,the distribution of lining water pressure and the structural stress characteristics of the tunnel under the two drainage methods of setting a central drainage trench under the inverted arch and setting a central drainage trench within the invert filling layer were analyzed by numerical simulations.The results show that,when the central drainage trench is set under the inverted arch,the drainage trench and the drainage holes can drain together,which can significantly reduce the pore water pressure of the surrounding rock at the bottom of the tunnel,and the water pressure borne by the inverted arch is relatively small,which can effectively reduce the risks of the inverted arch uplift and frost boiling and mud pumping under high-pressure water-rich conditions.Compared with the central drainage trench set within the invert filling,the bending moment at the centre of the inverted arch is significantly reduced when the central drainage trench is set under the inverted arch,and the safety coefficient of the side wall and the inverted arch parts is significantly increased,the invert filling layer and the inverted arch are synergistically stressed,and the structural integrity of the tunnel bottom is enhanced.The field application shows that although the process is slightly complicated,the central drainage trench under the inverted arch has a good waterproof and drainage effect,which can be promoted and applied in water-rich karst tunnel.

关 键 词：铁路隧道 隧底排水 数值模拟 流固耦合 中心排水沟 受力特性 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]