富水固结黏土层浅埋暗挖隧道工程实例研究  

Research on Shallow Buried Tunnel in Watery Consolidation Clay Layer

作　　者：刘魁刚[1] 

机构地区：[1]北京市轨道交通建设管理有限公司,北京100068

出　　处：《施工技术》2016年第1期88-91,共4页Construction Technology

摘　　要：北京地区浅埋暗挖法隧道通常采用普通管井降水,但是对于裂隙发育的富水固结状黏土地层,由于地层中裂隙的存在,垂直渗透系数和水平渗透系数差异巨大,普通管井降水半径小、形不成漏斗效应,效果极差。需采取地面井点降水结合隧道内明排的方式,才能保证隧道开挖及初期支护的质量、安全和施工效率。Ordinary well dewatering is usually used in Beijing when shallow tunnel by excavation.However,when it comes to fractured water-rich consolidation of clay-like formations,owing to the existence of fissure in layer,vertical permeability and horizontal permeability have huge difference,and ordinary well dewatering has small radius and can＇t form a funnel,resulting to the bad effect. In order to ensure the quality,safety and construction efficiency of tunnel excavation in primary support,measures like well-points dewatering on the ground combined with open-discharge inside the tunnel should be taken.

关 键 词：隧道工程 浅埋暗挖 降水 裂隙 渗透系数 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]