覆盖型岩溶区高速铁路综合选线研究

Research on comprehensive route selection of high-speed railway in covered karst area

南玉高铁沿线覆盖型岩溶和膨胀岩(土)广泛发育,岩溶发育程度强烈,膨胀岩(土)多呈弱—中等膨胀性,给高速铁路勘察设计、施工运营全生命周期均带来较大风险和挑战。通过分析沿线地形地貌、特殊的岩溶地质特征和工程环境特点,提出针对性的勘察方法和选线原则,前期选线贯彻“短距通过,傍山绕避”原则,针对确实无法绕避的岩溶强烈发育区,提出“双向跨越”思路,安全、经济地跨越深溶槽,以期为覆盖型岩溶区高速铁路勘察设计及工程建设提供借鉴。

Along the Nanning-Yulin high-speed railway developed the covered karst and swelling rock(soil)widely,karst development degree is strong,swelling rock(soil)is mostly weak-medium expansion,brings greater risk and challenges to high-speed railroad survey,design,construction and operation of the whole life cycle.The paper proposes targeted line selection principles by analyzing the topography,special geological characteristics of karst along the line,and the characteristics of the engineering environment.The preliminary line alignment study implements the line selection principle of“pass through short distance and then alongside the mountain”.For areas with strong karst development that cannot be bypassed,we propose the idea of“two-way crossing”to safely and economically cross the deep karst troughs.The research results can provide reference for the survey design and engineering construction of high-speed railway in covered karst area.