Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer |
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| Authors: | Hai-Min Lyu Shui-Long Shen Yong-Xia Wu An-Nan Zhou |
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| Affiliation: | 1. MOE Key Laboratory of Intelligent Manufacturing Technology, Department of Civil and Environmental Engineering, College of Engineering, Shantou University, Guangdong, China;2. State Key Laboratory of Internet of Things for Smart City, University of Macau, Macau, China;3. College of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China;4. Civil and Infrastructure Discipline, School of Engineering, Royal Melbourne Institute of Technology (RMIT), Melbourne, Vic, 3001, Australia |
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| Abstract: | When pumping is conducted in confined aquifer inside excavation pit (waterproof curtain), the direction of the groundwater seepage outside the excavation changes from horizontal to vertical owing to the existence of the curtain barrier. There is no analytical calculation method for the groundwater head distribution induced by dewatering inside excavation. This paper first analyses the mechanism of the blocking effects from a close barrier in confined aquifer. Then, a simple equation based on analytical solution is proposed to calculate groundwater heads inside and outside of the excavation pit with waterproof curtain (hereafter refer to close barrier) in a confined aquifer. The distribution of groundwater head is derived according to two conditions: (i) pumping with a constant water head, and (ii) pumping with a constant flow rate. The proposed calculation equation is verified by both numerical simulation and experimental results. The comparisons demonstrate that the proposed model can be applied in engineering practice of excavation. |
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| Keywords: | Confined aquifer Waterproof curtain Dewatering Groundwater head |
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