半成岩地层采用群井降水技术的设计及应用  

Design & Application of Group Wells Dewatering in Hypabyssal Rock Stratum

作　　者：蒋盼平 Jiang Panping(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广东广州510010

出　　处：《市政技术》2022年第3期109-114,共6页Journal of Municipal Technology

摘　　要：第三系半成岩地层具有成岩度比较低、遇水易软化等问题,容易引起地下工程在开挖过程中的塌方、大变形、涌水等现象。鉴于此,对半成岩地层内采用地面群井降水的设计方案进行了详细介绍,并通过总结之前相关工程经验、结合降水试验和最终现场实施效果,证明了在半成岩地区采用降水措施可以得到良好的效果,降水后地层的摩擦角和黏聚力均有大幅提高,可以满足地下工程实施要求。该应用成果可为同类工程实施提供有益借鉴。Problems of lower diagenesis intensity,tendency to water-expanding often occur in tertiary hypabyssal rock stratum,which would cause collapse,large deformation and water gushing during construction.The design scheme of group wells dewatering method in hypabyssal rock stratum are introduced in detail.By summing up previous construction experience,dewatering tests and field effects,it’s proved that good results had been achieved by group dewatering methods in hypabyssal rock area.The friction angle and cohesion of the stratum had been substantially increased after dewatering and satisfied underground engineering requirements.This application result can provide beneficial reference for other engineering projects.

关 键 词：半成岩 群井降水 降水设计 

分 类 号：U231.3[交通运输工程—道路与铁道工程]