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A case study on ground treatment for a rock tunnel with high groundwater ingression in Taiwan
Authors:Dar-Jen Tseng  Bin-Ru Tsai  Lung-Chen Chang
Affiliation:1. Third District Project Office, Taiwan Area National Expressway Engineering Bureau, Taipei, Taiwan;2. Sinotech Engineering Consultants Inc., Taipei, Taiwan;1. Department of Applied Mechanics, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, China;2. School of Civil Engineering, Central South University, Changsha, China;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China;2. Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel;3. China Railway Liuyuan Group Co., Ltd, Tianjin 300308, China;1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China;2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;3. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan 430072, China;4. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. Institute of Tunnel and Underground Structure Engineering, School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;3. School of Highway, Chang’an University, Xi’an 710064, China;1. Geotechnical & Structural Engineering Research Center, Shandong University, Jinan, Shandong 250061, China;2. School of Qilu Transportation, Shandong University, Jinan, Shandong 250061, China;3. School of Civil Engineering, Shandong University, Jinan, Shandong 250061, China;4. Shanxi Water Conservancy Construction Engineering Bureau Co., Ltd, Taiyuan, Shanxi 030006, China
Abstract:This paper presents a case study on the collapse caused by sudden groundwater ingression in the Pinglin pilot tunnel, and the treatments developed for the adverse ground conditions encountered. The ideas for the ground treatment are to reduce groundwater pressure as well as to consolidate the fractured zone in rock formations. The paper highlights the importance of paying particular attention to the ground treatment process and grouting quality control. Ongoing adjustments of grouting mixture and pressure may be necessary with the changing ground conditions.
Keywords:Case study  Collapse  Groundwater ingression
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