四线并行盾构隧道下穿火车站股道沉降特征研究

doi:10.13722/j.cnki.jrme.2017.0420

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摘要

为了探究南宁地铁1，2号线四线并行盾构下穿火车站股道的沉降特征，建立基于叠加技术的Peck公式。利用Peck公式，分别计算每条隧道引起股道附加沉降，叠加各条曲线得到的沉降槽作为四线并行盾构掘进引起的股道总沉降，并分析2号线盾构施工沉降超限的原因。结果表明：叠加技术能够应用于四线盾构隧道引起股道沉降的计算，叠加得到的总沉降与自动化监测的结果基本一致，后行隧道引起的附加沉降槽的轴线向四线隧道中线发生偏移，但总的沉降槽轴线处于四线隧道中线处；给出富水圆砾地层中盾构推进导致地表沉降槽宽度系数范围，建议四线并行盾构隧道下穿重要风险源时，地层损失率控制在0.4%以内；泥岩的存在导致了2号线盾构在穿越13股道和11股道时发生沉降超限，合理提高开挖面泥水压力并减小压力波动，减缓盾构掘进速度并适当提高注浆压力是控制沉降的关键。

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关键词 ：隧道工程, 四线并行盾构隧道, 叠加技术, Peck公式, 地表沉降, 土体损失

Abstract：

In order to investigate the settlement characteristic of quadruple-tube parallel shield tunnels(QTPST) crossing railway tracks in Nanning metro line 1 and 2，a modified Peck formula based on superposition technique is conducted. It appears that one can construct additional settlement induced by each tunnel using the Gaussian function and combine the four curves to obtain a total settlement trough as the total settlement induced by QTPST. The filed results indicate that the superposition technique can describe the settlement trough induced by QTPST appropriately，which coincide well with the automatic monitoring results. There is an offset of the additional settlement trough from the axis of the related tunnel to the centerline of QTPST in transverse section while the total settlement trough is almost symmetric around the centerline of QTPST. The settlement trough width parameters are put forward as well as the ground loss ratio. A value of ground loss ratio is suggested smaller than 0.4% when QTPST crossing crucial buildings with high risk. By analyzing the tunnelling parameters of metro line 1 and 2，it is found that the existence of mudstone is the main reason that caused the extreme settlement when metro line 2 crossing track no. 13 and 11. It is beneficial to make the slurry pressure in tunnel face under control，slow down the advance speed and increase the synchronous grouting pressure for settlement control.

Key words： tunnelling engineering quadruple-tube parallel shield tunnels superposition technique Peck formula surface settlement ground loss

引用本文:

王强1，2，谢雄耀1，2，黄钟晖3，齐勇4. 四线并行盾构隧道下穿火车站股道沉降特征研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4235-4243.
WANG Qiang1，2，XIE Xiongyao1，2，HUANG Zhonghui3，QI Yong4. Study of settlement troughs over quadruple-tube parallel shield tunnels crossing railway tracks. , 2017, 36(S2): 4235-4243.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0420 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4235

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