地铁车站拱盖法施工沉降监测分析及控制对策

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Abstract Zhongshan Park Station of Qingdao subway line No.3，which is constructed by arch cover method，locates in soil-rock composite layer. The maximal excavation depth is about 27.24 m. Upper overburden is composed of quaternary and highly weathered granite，and the lower part is consisted of medium-slightly weathered granite and granite-porphyry. The thickness of partially highly weathered rock layer is large and the medium-slightly weathered rock surface is partly steep，which makes the contact surface unstable. To ensure the excavation work，the ground subsidence was monitored and analyzed at the station. Results indicate that the subsidence emerges before the tunnel working face reaches to about 20 m in front of monitoring sections when the arch cover method was adopted. With the decrease of distance between the tunnel working face and monitoring sections，the subsidence velocity continues to increase. Generally，the value of subsidence is 7–15 mm when the excavation face was going through the monitoring sections. The velocity of ground subsidence increases to the maximum until the working face passes through the monitoring sections for 5–10 m. After the working face passes through the monitoring section for more than 10 m，the subsidence velocity begins to fall. Most of observation points have the trend to be stable after the working face passes through the monitoring sections for about 20 m. Supporting should be exerted and closed as early as possible to make sure that the supporting can play a good role. In addition，there is a interrelationship between the left and right pilot tunnels. It is indicated that the appropriate distance between the left and right pilot tunnels should be 2.5 times of the diameter of pilot tunnel. According to the monitoring and analysis results，a series of control measures are put forward，which are proved to be feasible and effective by practice.

Key words： tunneling engineering subway station arch cover method ground subsidence monitoring and analysis control measures tunneling engineering subway station arch cover method ground subsidence monitoring and analysis control measures

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	Articles by authors
	ZHANG Guangquan1
	2
	DU Zijian3
	SONG Jinquan2
	CAI Jiande2
	TAO Tiejun1
	2

Cite this article:

ZHANG Guangquan1,2,DU Zijian3, et al. MONITORING AND ANALYSIS OF EXCAVATION-INDUCED SUBSIDENCE OF SUBWAY STATION CONSTRUCTED BY ARCH COVER METHOD AND CONTROL MEASURES[J]. , 2012, 31(S1): 3413-3420.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/3413

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