A case history of field pumping tests in a deep gravel formation in the Taipei Basin,Taiwan |
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| Authors: | James C Ni Wen-Chieh Cheng Louis Ge |
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| Institution: | 1. Department of Civil Engineering, National Cheng Kung University, Taiwan;2. Department of Civil Engineering, National Taiwan University, Taiwan;3. Environmental & Engineering Geology Division, Central Geological Survey, MOEA, Taiwan;1. Institute of Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan;2. Department of Civil Engineering, National Taiwan University, Taipei, Taiwan;1. National Central University, Jongli, Taiwan;2. National Chiao Tung University, Hsinchu, Taiwan;3. National Taiwan University, Taipei, Taiwan;4. Chia Nan University of Pharmacy and Sciences, Tainan, Taiwan;1. Department of Civil Engineering, National Chiao Tung University, 1001, University Road, Hsinchu 30010, Taiwan;2. Water Resources Planning Institute, Water Resources Agency, MOEA, 1340, Jhong-jheng Road, Wu-fong, Taichung 41350, Taiwan |
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| Abstract: | 33 large-diameter wells embedded in 2-m thick, 63-m deep diaphragm walls were constructed to reduce both the uplift pressures and the groundwater inflow during the excavations. As the actual thickness of the pumped aquifer is unknown, the installed wells are regarded as partial penetration wells. Single-well and multi-well pumping tests were conducted in the deep gravel formation of Taipei Basin to derive the hydraulic parameters and to investigate the drawdown characteristics at both the construction and remote sites. However, the tidal effect on the drawdown of both the pumping well and nearby observation wells was found significant. Additionally, wellbore storage, skin, and leakage need to be taken into account for deriving the hydraulic parameters. Hence, a method to remove these five factors influencing the drawdown curve is developed, which takes advantage from the late-time characteristics of drawdown data and the early-time behavior of drawdown. Some currently available semi-log graphic techniques are therefore proven applicable for parameter determination. Validity of the proposed method is verified by the good agreement between the calculated and the measured drawdown of both the pumping well and observation well. |
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