Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

Ijaz Ahmad, Muhammad Tayyab, Muhammad Zaman, Muhammad Naveed Anjum and Xiaohua Dong
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Ijaz Ahmad: Centre of Excellence in Water Resources Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Muhammad Tayyab: College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
Muhammad Zaman: Department of Irrigation and Drainage, University of Agriculture, Faisalabad 38000, Pakistan
Muhammad Naveed Anjum: State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Xiaohua Dong: College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China

Sustainability, 2019, vol. 11, issue 3, 1-17

Abstract: This study investigates a large deep foundation pit of a hydraulic structure rehabilitation program across the Indus river, in the Punjab province of Pakistan. The total area of the construction site was 195,040 m 2 . Two methods, constant head permeability test and Kozeny–Carman equation, were used to determine the hydraulic conductivity of riverbed strata, and numerical simulations using the three-dimensional finite-difference method were carried out. The simulations first used hydraulic conductivity parameters obtained by laboratory tests, which were revised during model calibration. Subsequently, the calibrated model was simulated by different aquifer hydraulic conductivity values to analyze its impact on the dewatering system. The hydraulic barrier function of an underground diaphragm wall was evaluated at five different depths: 0, 3, 6, 9, and 18 m below the riverbed level. The model results indicated that the aquifer drawdown decreases with the increase in depth of the underground diaphragm wall. An optimal design depth for the design of the dewatering system may be attained when it increases to 9 m below the riverbed level.

Keywords: dewatering; large deep foundation pit; numerical simulation; Taunsa Barrage (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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