Effect of Excavation-Induced Groundwater Level Drawdown on Tunnel Inflow in a Jointed Rock Mass
Effect of Excavation-Induced Groundwater Level Drawdown on Tunnel Inflow in a Jointed Rock Mass
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DOI：
10.1016/j.enggeo.2009.09.002
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发表时间：
2010-02
影响因子：
7.4
通讯作者：
Joon-Shik Moon;G. Fernández
中科院分区：
文献类型：
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作者：
Joon-Shik Moon;G. Fernández
目前工程实践中用来估算隧道涌水量的分析和经验方法不能充分考虑地下水位下降的影响，地下水位下降会引起流态的变化和水头的降低。当隧道走线附近没有水库或大量水体时，隧道上方的地下水补给可能不够快，无法避免因开挖而导致的水位显著下降。本文给出了考虑地下水位下降时估算地下水涌水量的分析方法。文中提出的解析解与现场观测结果以及离散单元法数值分析结果吻合较好，能较好地模拟岩体节理的水-力耦合行为。
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.