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A combined analytical-numerical method for groundwater inflow into circular tunnels in drained conditions
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A combined analytical-numerical method for groundwater inflow into circular tunnels in drained conditions
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A combined analytical-numerical method for groundwater inflow into circular tunnels in drained conditions
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Journal Article
A combined analytical-numerical method for groundwater inflow into circular tunnels in drained conditions
2021
Overview
The excavation and construction of tunnels in drained conditions essentially involves groundwater inflow, which results in water-table drawdown, groundwater inflow rate reduction, and pore-water pressure redistribution. A combined analytical-numerical method is proposed to estimate the groundwater inflow into circular tunnels in drained conditions. The method consists of three semianalytical formulas for shallow, deep, and lined tunnels, based on the trench model and the image method. Then, various two-dimensional cross-section numerical models are built, considering different model parameters like tunnel radius, initial water level, and lining. Based on the numerical results, the effects of the lining on the water inflow rate, drawdown, and water pressure are evaluated, and the semianalytical formulas are obtained by regression analysis. The most interesting finding is that the free surface intersects the tunnel boundary when r/h ≥ 0.062, which is regarded as a criterion for dividing shallow and deep tunnels in this study. The proposed semianalytical formulas, taking into account the effect of the drained condition, can provide better predictions of tunnel inflow compared to existing analytical formulas.
