软质岩高边坡路基改隧道方案研究

Schematic Study of Changing High-slope Subgrade with Soft Rock to Tunnel

随着高速铁路在西南山区的大规模建设,受站间距及曲线半径的影响,部分越行站需设于地形及地质条件恶劣处。云桂铁路白腊寨车站内路基就由于此种条件出现了极高边坡情况(101.7 m),为规避工程风险,对此路基地段进行了隧道方案研究,分析了各个方案的优缺点,并在工程地质、工程风险、工程投资及运营风险等方面进行了全面的比较,最终确定采用明挖隧道方案。

With large-scale construction of high-speed railway in the southwestern mountain region in China, and under the restrictions of the station spacings and curve radiuses, some overtaking stations have to be built at the positions where the topography and geology conditions are unfavorable. Because of above-mentioned restrictions, this phenomenon occurred in the Bailazhai Station of Kunming-Nanning Railway in the form of a extra-high subgradde slope of 101.7 meters high. To avoid project risk, the schemes of changing the subgrade to tunnel were studied, the advantages and disadvantages of every scheme were analyzed, and the relevant issues were compared comprehensively, such as the engineering geology, project risk, project cost, operation risk and so on. Finally, a scheme of opencut tunnel was determined.