Effect of highly pervious geological features on ground-water flow into a tunnel |
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| Authors: | J Moon S Jeong |
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| Institution: | 1. Samsung C&T Corporation, 1321-20 Seocho-2Dong, Seocho-Gu, Seoul, Republic of Korea;2. Yonsei University, school of civil & Enviromental Engineering, Sinchon-Dong, Seoul, Republic of Korea;1. National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing, China;2. Key Laboratory for Water Environment and Resources, Tianjin Normal University, Tianjin, China;3. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, USA;4. Xi''an Center of Geological Survey, China Geological Survey, Xi''an, China;1. School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China;2. State Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing, 100083, China;3. School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, 5005, SA, Australia;4. James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK;5. Department of Civil Engineering, School of Civil & Resource Engineering, University of Science & Technology Beijing, Beijing, 100083, China |
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| Abstract: | Current practice for estimating water inflow rate relies mostly on analytical solutions which assume a homogeneous, isotropic porous medium around a tunnel. Field measurements indicate that current engineering practice does not consistently make adequate estimate of ground-water flow into a tunnel during excavation due to various factors that analytical solutions do not properly take into account. Among the various factors affecting ground-water flow, the significance of a highly pervious feature located near the tunnel is discussed in this research. The highly pervious feature, which is located near an underground opening and connected to a large source of water, can provide a path for relatively high-head water to the joints intersecting the opening. This paper describes the influence of a highly pervious feature on the ground-water flow regime around a tunnel and the change of inflow rate as the tunnel approaches a highly pervious feature. |
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