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Effect of Excavation-Induced Groundwater Level Drawdown on Tunnel Inflow in a Jointed Rock Mass

机译：开挖引起的地下水位下降对节理岩体中隧道入流的影响

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摘要

Analytical and empirical methods used in current engineering practice for estimating inflow rate into a tunnel do not adequately account for the effect of groundwater level drawdown which triggers changes of the flow pattern as well as reductions of the hydraulic head. When there is no reservoir or a large body of water near the tunnel alignment, the groundwater recharge above the tunnel might not be fast enough to avoid a significant excavation-induced water level drawdown. This paper provides analytical methods for estimating groundwater inflow rate taking into account the groundwater table drawdown. The proposed analytical solutions presented here compare well with field observations as well as with results from numerical analysis using distinct element method which can adequately simulate the hydro-mechanically coupled behavior of joints in a rock mass.
机译：当前工程实践中用于估计流入隧道的流量的分析和经验方法不能充分考虑地下水位下降的影响，因为地下水位下降会触发流态的变化以及液压头的减少。如果在隧道路线附近没有水库或有大量的水，隧道上方的地下水补给可能不够快，无法避免因开挖引起的水位明显下降。本文提供了考虑地下水位下降的估算地下水流入量的分析方法。此处提出的分析解决方案与现场观测以及使用独特元素方法进行数值分析的结果进行了很好的比较，这些元素可以充分模拟岩体中节理的水力耦合行为。

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