Su Kai, Zhou Yafeng, Wu Hegao, Shi Changzheng, Zhou Li
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, 299 BaYi Road, Wuhan, 430072, China.
Changjiang Institute of Survey, Planning, Design and Research, Changjiang Water Resources Commission, 1863 Jiefang Avenue, Wuhan, 430010, China.
Ground Water. 2017 Sep;55(5):712-721. doi: 10.1111/gwat.12513. Epub 2017 Mar 22.
Groundwater inflow estimation is essential for the design and construction of tunnel and the assessment of the environmental impacts. Analytical solutions used in current engineering practice do not adequately account for the effect of the excavation-induced drawdown, which leads to significant change in pore water pressure distribution and reductions of the water level beyond tunnel. Based on the numerical analysis results, this article proposes semianalytical method to predict the height of lowered water level and groundwater tunnel inflow. The tunnel problem is conceptualized as two-dimensional flow in a plane perpendicular to the tunnel axis. The analytical formula, considering the effect of the excavation-induced drawdown, provides a better prediction of the tunnel inflow compared to the existing analytical formulas, even for the cases with inclined groundwater level.
地下水流估算对于隧道的设计与施工以及环境影响评估至关重要。当前工程实践中使用的解析解并未充分考虑开挖引起的水位下降效应，这会导致孔隙水压力分布发生显著变化以及隧道外水位降低。基于数值分析结果，本文提出了一种半解析方法来预测水位下降高度和隧道地下水流入量。将隧道问题概念化为垂直于隧道轴线平面内的二维流动。与现有的解析公式相比，考虑了开挖引起的水位下降效应的解析公式能更好地预测隧道的流入量，即使对于地下水位倾斜的情况也是如此。
