各向同性浅埋隧洞复合衬砌外水压力影响因素  

Isotropic Shallow Buried Tunnels

作　　者：杜恒恒 DU Hengheng(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]华北水利水电大学地球科学与工程学院,郑州450046

出　　处：《科技和产业》2025年第5期108-114,共7页Science Technology and Industry

摘　　要：以某灌区1号隧洞为工程背景,采用“堵水限排”的防水设计原则,探讨各向同性浅埋隧洞复合衬砌条件下外水压力的影响因素。建立复合衬砌简化模型,解析推导隧洞衬砌外水压力和渗流量随围岩渗透性、灌浆层渗透性、衬砌渗透性以及水头变化的解析解。同时运用Midas有限元软件计算不同条件下隧洞衬砌外水压力和渗流量大小,验证解析解的合理性。研究表明,灌浆圈的渗透性和厚度对衬砌外水压力和渗流量的影响较大,应当重视灌浆圈的施工。随着排水孔入岩深度的增大,隧洞衬砌外水压力逐渐减小。因此,在较高地下水头作用环境下,隧道上设置排水孔是降低外水压力的最有效措施。Taking the No.1 tunnel of an irrigation district as the engineering background,the waterproofing design principle of“blocking water and limiting drainage”was adopted to explore the influencing factors of external water pressure under the composite lining condition of isotropic shallow buried tunnels.A simplified model of composite lining was established to analyze and derive the analytical solution of the variation in external water pressure and seepage volume in relation to the surrounding rock's permeability,grouting layer,lining permeability and head.At the same time,the Midas finite element software was used to calculate the water pressure and seepage volume under different conditions to verify the reasonableness of the analytical solution.The study shows that the permeability and thickness of the grouting ring have a greater influence on the water pressure and seepage volume outside the lining,and the construction of the grouting ring should be emphasized.With the increase of the depth of the drainage hole into the rock,the water pressure outside the tunnel lining gradually decreases.Therefore,in the environment of high groundwater head,setting drainage holes on the tunnel is the best effective measure to reduce the external water pressure.

关 键 词：堵水限排 衬砌外水压力 渗流量 解析解 数值模拟 

分 类 号：U455.91[建筑科学—桥梁与隧道工程]