暗挖交叠隧道地表沉降实测分析

发布时间：2019-04-13 14:24

【摘要】：北京地铁6号线北海北—南锣鼓巷区间隧道工程为北京地区首例暗挖交错重叠隧道工程,区间隧道从上下平行逐级过渡为左右平行,隧道开挖方式为先开挖右线隧道(下行隧道),再开挖左线隧道(上行隧道)。文章通过对该工程18个地表沉降监测断面实测数据进行分析,得出暗挖交错重叠隧道施工引起的地表变形规律。研究结果表明:(1)随着双线隧道角度的增加、距离的减少,地层沉降重叠效应显著增加,后建的左线隧道开挖对地表沉降影响也逐渐增加;(2)左线隧道施工改变了地表沉降槽的形式,使双线隧道地表最大沉降值的位置偏离右线隧道,沉降槽宽度增加;(3)既有结构的存在阻挡了地层变形的传递,减小了地表的变形,双线隧道的减小程度比单线隧道大;(4)采用深孔注浆的方式可以有效控制地表沉降,减少施工对周边环境的影响。研究成果可为同类工程地表变形控制提供参考。
[Abstract]:The Beihai-Nanluo-Gu-Xiang interval tunnel project of Beijing Metro Line 6 is the first underground overlapping tunnel project in Beijing, with the interval tunnel transitioning from upper to lower parallel to left and right parallel. The tunnel is excavated first in the right tunnel (downlink tunnel) and then in the left line tunnel (upstream tunnel). By analyzing the measured data of 18 surface settlement monitoring sections of the project, this paper obtains the law of surface deformation caused by the construction of the overlaying and overlapping tunnel. The results show that: (1) with the increase of the angle of the double-line tunnel and the decrease of the distance, the overlapping effect of the ground settlement increases significantly, and the influence of the left-line tunnel excavation on the surface settlement increases with the increase of the tunnel angle and the decrease of the distance. (2) the left line tunnel construction has changed the form of the surface settlement trough, which makes the position of the maximum settlement value of the double-line tunnel deviate from the right line tunnel, and the width of the settlement trough increases; (3) the existence of the existing structure blocks the transfer of ground deformation and reduces the deformation of the surface, and the reduction of the double-line tunnel is greater than that of the single-line tunnel; (4) Deep hole grouting can effectively control the surface settlement and reduce the influence of construction on the surrounding environment. The research results can provide reference for surface deformation control of similar projects.
【作者单位】：北京市基础设施投资有限公司;
【基金】：中央引导地方科技发展专项资金项目(Z161100004516014)
【分类号】：U456.3

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