考虑盲管排水和防水板隔水的隧道支护体系分担水荷载解析解

发布时间：2018-03-11 22:18

本文选题：隧道工程　切入点：水荷载　出处：《岩石力学与工程学报》2015年S2期 　论文类型：期刊论文

【摘要】：盲管排水和防水板隔水是富水区山岭隧道修建过程中的关键科学问题。研究围岩、注浆圈、盲管、防水板、初期支护以及二次衬砌共同承担水荷载相互作用,推导出基于盲管限量排水和防水板隔水效应的支护体系水荷载非线性解析式。引入盲管"导水系数"的概念,获得盲管和防水板是否正常工作,以及支护体系水荷载相互作用定量化关系,为排水量的"主动控制"提供依据。当盲管排水量增大时,初期支护、注浆圈和围岩承担的水荷载增大,二次衬砌水压力减小。以我国高速铁路祁连山大断面隧道为例,提出防水板隔水条件下,盲管排水量与衬砌外水压力、折减系数关系,实现盲管"主动排水",符合工程支护体系实际情况。提出合理的注浆圈厚度和渗透系数;随着水压力的增加,衬砌结构最不利位置由拱部向仰拱转移;墙脚压剪破坏、仰拱压弯破坏;确定衬砌结构极限承载力。研究成果可为富水隧道设计和施工提供依据。
[Abstract]:Blind pipe drainage and waterproofing are the key scientific problems in the construction of mountain tunnel in water-rich area. The interaction of water load on surrounding rock, grouting ring, blind pipe, waterproof board, initial support and secondary lining is studied. The nonlinear analytical formula of water load in support system based on the limited drainage of blind pipe and the water barrier effect of waterproof board is derived. The concept of "water conductivity" of blind pipe is introduced to obtain whether the blind pipe and waterproof board are working normally. The quantitative relationship of water load interaction in support system provides the basis for "active control" of water displacement. When the blind pipe discharges increase, the initial support, grouting ring and surrounding rock bear more water load. The secondary lining water pressure is reduced. Taking Qilian Mountain large-section tunnel of high-speed railway in China as an example, the relationship between blind pipe displacement and lining external water pressure and reduction coefficient is put forward under the condition of waterproof plate water insulation. Realize blind pipe "active drainage", accord with the actual situation of engineering support system. Put forward reasonable grouting ring thickness and permeability coefficient; with the increase of water pressure, the most unfavorable position of lining structure is transferred from arch to inverted arch; The ultimate bearing capacity of lining structure is determined. The research results can provide the basis for the design and construction of water-rich tunnel.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;西南交通大学土木工程学院;武汉大学土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51078318,51278427)
【分类号】：U453.6

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