地铁车站导洞双向开挖对地层沉降影响研究  

A Research of Two-way Heading Excavation of Subway Station on the Surface Subsidence

作　　者：李涛[1] 王帅[1] 陈慧娴[1] 刘波[1] 王珑桦 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《湘潭大学自然科学学报》2016年第3期23-29,共7页Natural Science Journal of Xiangtan University

基　　金：国家自然科学基金青年科学基金项目(51508556);北京高等学校青年英才计划项目(YETP0944);中央高校基本科研业务费专项资金项目(2009QL02)

摘　　要：地铁车站洞桩法导洞的开挖过程、方向及顺序是控制地层沉降的关键.基于北京某地铁车站施工过程中地层沉降的实测数据,建立三维有限差分数值模型,详细分析导洞双向开挖时地层的沉降规律;在此基础上,进一步分析了上覆土层厚度、洞径、洞距对地层沉降曲线中反弯点距离i的影响.结果表明:导洞开挖结束后地表沉降便随即趋于稳定,基本无滞后性;地层沉降主要在车站中心线左右30m范围内;横通道中心线反弯点距离i约为2.5倍洞距,其与洞径是近似线性的反比例关系,其与导洞埋深是近似线性的正比例关系.研究结果对类似工程建设具有参考意义.The pilot tunnel excavation process,the direction and the sequence of subway station hole pile method are keys to control strata subsidence.Based on the measured data of surface subsidence in the process of Beijing metro station construction,the 3dfinite difference numerical model is established and the subsidence regularity of two-way heading excavation is analyzed minutely.On this basis,the influences of the overburden thickness,hole diameter and hole spacing on the strata subsidence curve inflection point distance i are further analyzed.Results show that,after the pilot tunnel excavation the surface subsidence is stable immediately and nearly has no lag.Surface subsidence is mainly located in the area within the range of30 meters to the center line of the station.The i is about 2.5times of hole spacing.The relationship between hole spacing and i is proportional and linear.The relationship between overburden thickness and i is also proportional and linear.The results of the study have reference and significance for similar engineering construction.

关 键 词：地铁车站 洞桩法 数值模拟 地表沉降 沉降槽 

分 类 号：U231.3[交通运输工程—道路与铁道工程]