Inverse modelling of groundwater flow around a large-scale underground cavern system considering the excavation-induced hydraulic conductivity variation |
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| Institution: | 1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Chinese Academy of Sciences, Institute of Rock and Soil Mechanics, Wuhan 430071, China |
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| Abstract: | This study proposed an inverse modelling procedure for evaluating the anisotropic hydraulic conductivity and its variation induced by excavation in fractured rocks by integrating a strain-dependent hydraulic conductivity model. The time-series measurements of both hydraulic head and discharge were used to construct the objective function for improving the reliability, which was solved with a combined method of orthogonal design, transient groundwater flow modelling, artificial neural network and genetic algorithm-based optimization for reducing the computational cost. The proposed methodology proves its effectiveness by successful inverse modelling of the groundwater flow around the underground caverns at the Jinping-I Hydropower Station. |
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| Keywords: | Underground cavern system Inverse modelling Hydraulic conductivity Seepage control Fractured rocks |
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