Uncertainty analysis of groundwater inflow into underground excavations by stochastic discontinuum method: Case study of Siah Bisheh pumped storage project,Iran |
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| Affiliation: | 1. Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Hafez 424, Tehran 15875-4413, Iran;2. Curtin University, Western Australian School of Mine (WASM), Australia;1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. Jiangsu Research & Development Centre of Construction Safety and Disaster Mitigation, Xuzhou 221116, China;1. School of Earth and Environment, University of Leeds, Leeds, UK;2. Ruler Consult Ltd, London, UK;1. Mining Engineering Department, Nigde Omer Halisdemir University, Nigde, Turkey;2. Mining Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey |
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| Abstract: | This paper presents a framework for the near-field stochastic discontinuum modeling and uncertainty analysis of groundwater inflow into underground excavations by direct utilization of discrete fracture network (DFN) concept. The sources of uncertainty in the groundwater inflow into underground excavations in fractured rocks were classified into two different groups including the geometrical and hydraulic properties of fractures. The main input data for stochastic discontinuum modeling of groundwater inflow were captured from site investigations in Siah Bisheh pumped storage project in Iran. Detailed measurements of groundwater inflow into powerhouse and transformer caverns provided the possibility to determine the hydraulic aperture through back calibration. The validity of calibrated hydraulic aperture was explored by simulation results of the groundwater inflow into transformer cavern, and shows high accuracy when compared with data obtained from field measurements. The statistical results of these groundwater flow simulations with constant calibrated hydraulic aperture reflected the uncertainty associated with geometrical properties of fractures. Finally, the role of hydraulic properties of fractures on the uncertainty of groundwater inflow was investigated by the variation of standard deviation of hydraulic aperture through the sensitivity analysis. The results of this study demonstrated that the geometrical properties of fractures did much greater uncertainty in the groundwater inflow into underground excavations than hydraulic properties. Moreover, it was found that both the mean and standard deviation of simulated groundwater inflow into underground excavations decrease non-linearly by increasing the standard deviation of hydraulic aperture even though it is generally anticipated that the uncertainty of hydrogeological systems increases by increasing the variance of hydraulic parameters. |
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| Keywords: | Groundwater inflow Uncertainty Stochastic discontinuum Near-field DFN Hydraulic aperture Back calibration |
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