期刊
JOURNAL OF HYDROLOGIC ENGINEERING
卷 18, 期 11, 页码 1557-1561出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)HE.1943-5584.0000455
关键词
Coupling; Groundwater flow; Inflow; Tunnels; Underground structures; Simulation; Coupled model; Groundwater inflow; Underground tunnel; Discrete fractured network
资金
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0717]
- Program for Non-profit Industry Financial Program of MWR [200901064, 201001020]
- Fundamental Research Funds for the Central Universities [2009B00514]
- Natural Science Foundation of China [51079043]
- project of National Key Development Program for Fundamental Research [2010CB951101]
Groundwater inflow during tunnel excavation is a common problem in practice. How to accurately predict its occurrence during the construction is still a challenging problem for tunnel designers. A numerical method, based on the coupled model involved in artery fractures described by a discrete fractured network model and ramification fractures and rock matrix described by the equivalent continuum medium model, is developed to calculate the groundwater inflow of underground tunnel. The model is calibrated with the observed groundwater levels in the study domain. The results in the model calibration show that calculated and measured groundwater inflows agree well. Sensitivity analysis indicates that groundwater inflow increases with the increase of precipitation rate, hydraulic conductivity of rock matrix and fracture aperture. The effect of fracture aperture on groundwater inflow is predominant, owing to the occurring of many artery fractures around the tunnel, which leads to much groundwater flowing to the tunnel through these fractures. (C) 2013 American Society of Civil Engineers.
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