引黄工程南干7号隧洞涌水原因分析及涌水量预测

Analysis of Cause of Water Gushing and Prediction of Its Amount in No.7 Tunnel,the South Main Line of the YRDP

引黄南干７号隧洞，全长４３．５ｋｍ，其中２８．５ｋｍ的洞线穿过宁静向斜核部，地下水位高出洞线５０～３００ｍ。本文分析了７号隧洞洞线的富水地层及其构造特征，含水岩性及其富水特征，区域隔水层、地下水的循环动态，开挖后的涌水因素及相邻隧洞的涌水现象；估算并预测了它的涌水量。最后对影响施工的因素和开挖隧洞的注意事项做了简要的阐述。

The whole length of No.7 tunnel in the South Main Line of the YRDP is 43.5km,of which 28.5km cross the syncline core area,the level of ground water in this area is 50 300m higher than that of the tunnel line.The water bearing stratum and its tectonic characteristics along the tunnel line,aqueous petrofabrics and its water enrichment feature,regional water resisting layer,dynamic circulation of the ground water,cause of water gushing after the tunnel excavation and water gushing phenomena of the adjacent tunnel are analysed.In addition,the amount of water gushing of No.7 tunnel is estimated and predicted.Finally,the factors influencing construction and the method of excavation for tunnel are explained briefly.