隧道大规模突涌水水量预测及抽排技术  

Prediction and Drainage Technology of Large-scale Water Gushing in Tunnels

作　　者：陈建国[1] CHEN Jianguo(The First Construction Division Co.,Ltd.,of China Railway Tunnel Group,Chongqing 401121)

机构地区：[1]中铁隧道集团一处有限公司

出　　处：《公路交通技术》2019年第4期111-115,122,共6页Technology of Highway and Transport

摘　　要：长大隧道突涌水发生后,若水量预测及抽排方案设计无充分理论依据,会给施工造成很大的困难。为解决某新建铁路隧道斜井进入平导施工时发生的特大高压突水淹井难题,根据地层特点和施工情况,分析了突涌水原因,初步拟定采取分阶段抽排水技术;并通过计算选取各阶段抽排水设备和组织方式,不同于静态水抽排,计算考虑了稳定的动态补给水量,同时对水源补给和抽排端水头差变化进行了理论计算分析,预防抽排过程中水量突然增大造成二次淹井。结果表明:抽排水方案的顺利实施,缩短了已施工软弱围岩段落浸泡时间,避免或降低了结构损坏程度,也尽早揭示了突水溃口情况,为后续处理创造了良好条件。If there is no sufficient theoretical basis for water volume prediction and pumping scheme design after water gushing in long tunnel,it will cause great difficulties in construction.In order to solve the problem of extra-large high pressure water gushing and flooding wells during construction of horizontal guide of inclined shaft of a newly built railway tunnel,the causes of water gushing are analyzed according to stratum characteristics and construction conditions,and a preliminary plan is made to adopt stage-by-stage pumping and drainage technology.The pumping and drainage equipment and organization mode in each stage are calculated and choosed.Different from the static pumping,the steady dynamic recharge water quantity is taken into account during calculation.At the same time,the theoretical calculation and analysis of the water supply and the change of the head difference at the pumping end are carried out to prevent the secondary flooding caused by the sudden increase of the water quantity during the pumping and draining process.The results show that the successful implementation of the pumping and drainage scheme shortens the soaking time of the weak surrounding rock sections,avoids or reduces the degree of structural damage,and reveals the situation of water gushing and burst as soon as possible,which creates good conditions for subsequent treatment.

关 键 词：隧道 突涌水 预测 阶段抽排 

分 类 号：U453.6[建筑科学—桥梁与隧道工程]