特大跨超浅埋地铁隧道下穿天桥过程稳定性控制

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Abstract By analyzing the key effect factors of the stability and using numerical simulation for the complex excavation condition of Huahuiyuan metro tunnel，the corresponding control methods were proposed. And the stability of ultra shallow-buried tunnel with super large-span in the process of crossing bridge was investigated based on the monitoring results from excavation site. The results show that：(1) Its difficult to form an arch after the ultra shallow-buried tunnel with super large-span excavation and the obvious ground deformation caused by the excavation shows skewed which lead to the subsidence of No.2 pile exceeds the warning value. So，some strengthening measures must be taken. (2) The phenomenon of equivalent stress concentration in different parts of the tunnel structure has different sensitivities to the change of flat rate：the most sensitive part is skewback while the equivalent stress concentration in the vault does not change along with the flat rate. (3) The deformations of ultra shallow-buried tunnel with super large-span are mainly influenced by the excavation of each part，in which the dominant deformation is caused by core soil excavation and then by upper hole excavation. As a result，both of them are the key control parts. (4) Both sides heading method assisted by advanced small pipe grouting，backfilling grouting，short-hole micro seismic blasting and so on can control the ultra shallow-buried tunnel with super large-span stability in the process of crossing bridge effectively.

Key words： tunnelling engineering ultra shallow-buried tunnel with super large-span crossing bridge stability control both sides heading method

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	Articles by authors
	LI Dong1
	2
	3
	HE Xingling1
	QIN Le1
	KANG Yong2
	4
	ZHOU Dongping1
	3
	GUO Chenye1
	3

Cite this article:

LI Dong1,2,3, et al. STABILITY CONTROL OF ULTRA SHALLOW-BURIED METRO TUNNEL WITH SUPER LARGE-SPAN IN PROCESS OF CROSSING BRIDGE[J]. , 2013, 32(s2): 3636-3642.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3636

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