期刊
ENVIRONMENTAL EARTH SCIENCES
卷 75, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/s12665-015-5169-x
关键词
Ground fissure; Metro tunnel; Geohazards; Case history; Xi'an
资金
- National Nature Science Foundation of China (NSFC) [41372283, 51378004]
- Fundamental Research Funds for Central Universities [310821161022]
- China Postdoctoral Science Foundation [2015M570803]
- National Basic Research Program of China (973 Program) [2015CB057806]
Xi'an City is located at the central region of the Fenwei Plain, and there are 14 ground fissures (labelled GF1-GF14) which have been closely monitored in the urban area of Xi'an City. When a shield tunnel is constructed in a region with ground fissures, problems (such as cracking or failure of the tunnel lining, leakage of groundwater into the tunnel, damage to the completed tunnels and shield, and long-term instability) may be encountered due to the activity of ground fissure. To mitigate the adverse impact caused by the activity of ground fissure, a series of countermeasures are suggested in this paper, which include installation of movement joints, installation of a flexible layer for controlling deformation, foundation reinforcement with cement grouting, and improvement of existing water resistance. A case history regarding the metro tunnel (Xi'an Metro Line 1) which has been intersected the ground fissure 5 (GF5) obliquely was analyzed. The aforesaid countermeasures were applied to this case history. After improving the existing water resistance, the permeability of the surrounding soils was effectively reduced to about 4.0 x 10(-8) cm/s and the groundwater leakage into the tunnel was minimal. Observations of the accumulative ground surface settlement near the fissure verified the effectiveness of the countermeasures applied to this case history.
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