西宁至成都铁路热贡越岭段主要水文地质问题分析及选线

Analysis of main hydrogeological problems and route selection in Regong mountain section of Xining-Chengdu Railway

新建铁路西宁至成都线热贡越岭段地形及地质条件复杂,针对热贡越岭段弱成岩地层的水稳性、断层破碎带突涌水和水环境生态三个水文地质问题,综合分析了热贡越岭段地层的岩性及水文地质特征,并利用三种方法相结合计算预测了两个选线方案热贡越岭特长隧道的涌水量。提出了该区域水文地质选线原则,研究比较了从瓜什则盆地两侧边缘下穿的C13K和C25K选线方案。得出C25K方案水文地质条件较优的结论,为线路走向选择提供了科学依据,同时也为复杂水文地质条件下长隧道勘察设计提供参考。

The topography and geological conditions of the Regong mountain section in Xining-Chengdu Railway are complex. The lithology and hydrogeological characteristics of the Regong mountain section are comprehensively analyzed for the three hydrogeological problems in the area, such as the water stability of the stratum, the water burst in fault zone and the water environment. The water inflow of the two route schemes is predicted using three methods. The hydrogeological route selection principle is proposed in the region. Two underpass route schemes of C13 K and C25 K from the both sides of the Guashize Basin are studied and the C25 K scheme is superior in hydrogeological conditions. The study provides a scientific basis for the selection of the route direction, and also provides a reference for the survey and design of long tunnel under complex hydrogeological conditions.