盾构隧道施工引起的土层分层沉降规律实测研究

发布时间：2018-03-18 01:11

本文选题：地铁　切入点：盾构　出处：《隧道建设》2017年04期 　论文类型：期刊论文

【摘要】：为了获得北京地区盾构隧道施工引起地层位移的实测资料,并分析不同布置下双线盾构隧道引起的沉降特征,以北京地铁8号线二期工程为依托,分别在双线盾构区间隧道的平行段和交叠段设置分层沉降监测断面,研究盾构施工引起的不同深度处地层沉降规律。分析表明:北京典型地层不同深度的沉降槽曲线可用高斯分布来描述,沉降槽宽度随深度的增加不断减小;不同深度处,盾构到达监测断面前、超过监测断面1倍埋深距离、后期沉降这3部分大致各占总沉降的1/3;对于双线交叠盾构隧道,当先开挖下面的隧道再掘进上面的隧道时,沉降槽整体变深;北京典型地层条件下(地下水位以上),不同深度处沉降槽对应的地层损失率基本不变;施工中,盾构停机会使地层损失率和沉降量明显增大。
[Abstract]:In order to obtain the measured data of ground displacement caused by shield tunnel construction in Beijing area, and to analyze the settlement characteristics of double-line shield tunnel under different arrangement, based on the second phase project of Beijing Metro Line 8, Stratified settlement monitoring sections are set up in parallel and overlapping sections of double-line shield tunnel, respectively. The settlement law at different depths caused by shield tunneling is studied. The analysis shows that the settlement trough curve of typical strata in Beijing can be described by Gao Si distribution, and the width of settlement trough decreases with the increase of depth. The shield machine reaches the front of the monitoring fault and is more than twice the depth of the monitoring section. The settlement in the later period accounts for approximately one third of the total settlement. For the double-line overlapping shield tunnel, when the tunnel below is first excavated and then tunneled into the above tunnel, The formation loss rate corresponding to the settlement trough at different depths is basically unchanged under the typical formation conditions in Beijing. During construction, the formation loss rate and settlement will increase obviously when the shield machine stops.
【作者单位】：北京市勘察设计研究院有限公司;北京市轨道交通建设管理有限公司;
【分类号】：U455.43

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