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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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

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	Articles by authors
	WANG Qiang1
	2
	XIE Xiongyao1
	2
	HUANG Zhonghui3
	QI Yong4

Cite this article:

WANG Qiang1,2,XIE Xiongyao1, et al. Study of settlement troughs over quadruple-tube parallel shield tunnels crossing railway tracks[J]. , 2017, 36(S2): 4235-4243.

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

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