After the excavation of the tunnel in water-rich regions, the groundwater is continuously discharged into the tunnel. Excessive discharge will cause the groundwater table to drop, which will destroy the normal growth of vegetation and ecological balance. In order to protect the ecological environment, the key is to develop an effective method to determine the tunnel drainage. In this paper, a method for calculating the limit drainage of the tunnel is proposed based on area-well method and the concept of ecological groundwater table in ecology and agronomy. Some conclusions are drawn as follows. (1) When the ecological groundwater table is constant, with the increase of groundwater discharge, the drainage influence range of the tunnel decreases, the rainfall supplement quantity within the drainage influence range decreases, and the total groundwater discharge quantity Q_t also decreases gradually. Since the decreasing rate of is greater than that of Q_t, there is a unit drainage that makes the total groundwater discharge equal to rainfall supplement. (2) A separated tunnel under construction in Fuzhou City is taken as an example; the limit drainage q₀ of the separated double tunnel is 0.48 m³/(m·d) considering ecological groundwater table.

中文翻译：

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基于生态地下水位的分体隧道极限排水案例研究

富水地区隧道开挖后，地下水源源不断地排入隧道。过量排放会导致地下水位下降，破坏植被的正常生长和生态平衡。为了保护生态环境，关键是要制定有效的确定隧道排水的方法。本文基于面积-井法和生态学和农学中的生态地下水位概念，提出了一种隧道极限排水计算方法。得出一些结论如下。(1)当生态地下水位一定时，随着地下水排放量的增加，隧道排水影响范围减小，补雨量排水内影响范围减小，并且总地下水排放量Q_吨也逐渐减小。由于 的递减率大于Q _t的递减率，因此存在一个单位排水量，使地下水总排放量与补雨量相等。（2）以福州市在建的分离式隧道为例；考虑到生态地下水位，分离双隧道的极限排水q ₀为0.48 m ³ /(m·d)。