既有岩溶富水隧址区新建隧道涌水量预测探讨

Discussion on Water Inflow Prediction of New-building Tunnel in Existing Karst Water-rich Tunnel Zone

涌水量预测是隧道勘察设计中的重点和难点,尤其在受邻近隧道排水影响条件下,涌水量预测更是难上加难。通过现场试验获取水文参数,采用4种传统预测方法和Modflow数值模拟法对春天门隧道涌水量进行预测,并与实际监测结果对比,得到:1)受既有邻近羊鹿山隧道排水影响,春天门隧道涌水量(22992.15m^3/d)远小于羊鹿山隧道(43177.536m^3/d);2)传统计算方法中,科斯加可夫公式法计算结果(22992.15m^3/d)与实际涌水量(13646m^3/d)最为接近;3)Modflow软件数值计算法也是一种较适用的涌水量预测方法,预测涌水量为18005m^3/d,较接近真实值。

Prediction of tunnel water inflow is key and difficult in tunnel survey and design,which is more difficult especially under the influence of drainage from adjacent tunnels.The hydrological parameters are obtained through field tests.Four traditional prediction methods and Modflow numerical simulation methods are used to predict the water inflow of Chuntianmen tunnel,and the results are compared with the actual monitoring results.Conclusions are drew:1)Influenced by the drainage of the existing adjacent Yanglushan tunnel,the water inflow of Chuntianmen tunnel (22 992.15 m^3/d) is much smaller than that of Yanglushan tunnel (43 177.536 m^3/d);2)In the traditional calculation methods,the calculation result of Kosgakov formula method (22 992.15 m^3/d) is closest to the actual water inflow (13 646 m^3/d);3)The numerical calculation method of Modflow software is also suitable method for forecasting water inflow,and its result is 18 005 m^3/d,which approximates the real value better.