复杂条件下地铁超深竖井穿越多层承压水降水施工研究  

Research on the Construction of Multi Layered Pressure Water Dewatering for Subway Ultra Deep Vertical Shaft Crossing Under Complex Conditions

作　　者：营升 YING Sheng(China Railway 18th Bureau Group Corporation Limited,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2024年第4期195-198,210,共5页Railway Construction Technology

摘　　要：地下水是暗挖施工安全的重要控制因素,本文以北京地铁X号线起点区间大断面超深竖井施工为工程背景,通过竖井地下水治理方案比选、竖井降水方案模拟并建立多层致密含水层组地下水的二维非稳定渗流有限元数值模型,基于结果提出合理降水井井位、降水井结构、降水井数量及降水周期等设计参数;此外,以降水施工为研究对象,进行降水扰动变形分区评估,并建立三维地质数值分析模型,在保障降水效果的前提下,研究降水对邻近既有构筑物沉降及安全影响。Groundwater is an important control factor for the safety of underground excavation construction.This article took the construction of a large cross-section ultra deep vertical shaft in the starting section of Beijing Subway Line X as the engineering background.Through the comparison of vertical well groundwater treatment schemes,simulation of vertical well precipitation schemes,and the establishment of a two-dimensional unstable seepage finite numerical model of groundwater in a multi-layer dense aquifer group,reasonable design parameters such as well position,well structure,and number of wells were proposed based on the above.In addition,taking precipitation construction as the research object,a zoning evaluation of precipitation disturbance deformation was carried out,and a three-dimensional geological numerical analysis model was established.Under the premise of ensuring the effectiveness of precipitation,the impact of precipitation on the settlement law and safety of adjacent existing structures was studied.

关 键 词：多层致密含水层 二维非稳定渗流 扰动变形 数值模拟 沉降规律 

分 类 号：U455.9[建筑科学—桥梁与隧道工程]