既有线下邻近大断面地铁双隧道暗挖施工对地表形变的影响

doi:10.13722/j.cnki.jrme.2014.s2.085

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Abstract Based on a real project Jiaomen West Station in Beijing，details of two-dimensional finite element model for numerical analyses of surface ground subsidence are presented. Interpretation methods for parameters of soil-cement mixtures used to reinforce and pre-support excavation are proposed. Further numerical studies on the design and construction issues which significantly affect the ground subsidence caused by covered undercutting are then conducted. The study concludes that the proposed methodology to interpret the parameters of soil-cement mixtures is valid by comparing the simulation results and observed data. Moreover，the settlement trough under existing station structures is still in line with overseas research for Greenfield single tunnel，unconfined compressive strength of soil-cement mixture 1.5 MPa to 2.0 MPa is capable of making the excavation stable. The study also indicates that the surface ground subsidence has a correlation with pillar width.

Key words： tunnelling engineering large cross-sectional twin tunnels covered excavation grouting reinforcement leading ductule injecting numerical simulation

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	Articles by authors
	WANG Dongyuan1
	QU Huihong1
	LI Wenbo2

Cite this article:

WANG Dongyuan1,QU Huihong1,LI Wenbo2. ISSUES AFECTING GROUND SUBSIDENCE INDUCED BY COVERED EXCAVATION FOR LARGE CROSS-SECTIONAL TWIN TUNNEL UNDER EXISTING STRUCTURES[J]. , 2014, 33(S2): 4075-4085.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.085 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/4075

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