某抽水蓄能电站施工期地下洞室涌水量预测分析

洞室涌水量的准确预测对于确保抽水蓄能电站地下施工安全意义重大。综合考虑抽水蓄能电站水文地质条件和洞室施工布置情况,选用水均衡法、狭长水平坑道法和数值法3种方法分别对电站区地下洞室涌水量进行预测,并与洞室实测涌水量进行了对比。结果表明:水均衡法、狭长水平坑道法和数值法预测的洞室正常涌水量分别为4 409.58、4 976.78和4 242.24 m3/d,最大涌水量分别为5 167.56、5 463.31和4 763.43 m3/d。数值法预测的涌水量与实测值吻合较好,具有重要的参考价值。在下阶段洞室的施工过程中,数值法预测的涌水量可为管理部门在洞室排水设计等方面起到很好的指导作用。

Water inflow prediction of underground tunnels for a pumped storage power station during the construction period

Accurate prediction of the water inflow for the tunnels is of great significance to ensure the underground construction safety of pumped storage power station. Based on the hydro-geological conditions of the pumped storage power station and the layout of the underground tunnels, three methods including the water balance method, the long narrow horizontal tunnel method and the numerical method were used to predict the water inflow of underground tunnels in the power station area, and the simulated results were compared with the measured values. The results showed that the predicted normal water inflow values of water balance method, long narrow horizontal tunnel method and numerical method were 4409.58, 4976.78 and 4242.24 m³/d, respectively, and the largest inflows were 5167.56, 5463.31 and 4763.43 m³/d, respectively. Furthermore, the predicted water inflow using the numerical method agreed well with the measured value, which was an important reference. During the process of next construction stage, water inflow predicted from the numerical method can be a very good guidance for the management departments in design of drainage tunnel.