中尼铁路喜马拉雅山越岭段主要水文地质问题及选线研究

Study on the main hydrogeological problems and route selection along the Himalayan Mountain section of China-Nepal Railway

中尼铁路喜马拉雅山越岭段水文地质条件极其复杂。本文采用综合勘察方法,分析了喜马拉雅山越岭段的水文地质特征,针对喜马拉雅山越岭段第四系富水地层、突涌水风险及弱成岩地层水稳性等水文地质问题提出了选线原则。采用3种计算方法综合预测了3个选线方案的涌水量,并评估了3种线路方案的突涌水风险。经分析比较,认为CK方案的水文地质条件较优,研究结果为中尼铁路喜马拉雅山越岭段选线提供了依据。

The hydrogeological conditions of the Himalayan section in China-Nepal Railway are extremely complex. The main problems of Himalayan section are analyzed with comprehensive investigation methods. The route selection principles are proposed according to the hydrogeological problems, such as the Quaternary water-rich strata, groundwater gushing, the stratum stability affected by groundwater. Three calculation methods are used to predict the water inflow quantity of the three route schemes, and the water inrush risk of the three route schemes is estimated. The hydrogeological conditions of scheme CK are better after comparison. The study result provides a basis for route selection and design of China-Nepal Railway.