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研究目的:宝中铁路增建二线线路方案比选重点为六盘山区越岭方案的研究工作。由于该区域地质条件复杂,控制线路方案主要地质因素有滑坡、泥石流、地质构造、高烈度地震区、地应力、软质围岩及水文地质条件等,地质选线成为线路穿越六盘山区方案的主要依据。研究结论:根据各方案的地质条件比较,均衡坡西方案以两座特长隧道穿行于六盘山基岩山区,避开了滑坡等不良地质,隧道工程躲避了主干断裂的影响,围岩为岩性单一的白垩系地层,洞口少,浅埋段短,在地震频发的六盘山区,铁路工程的修建和运营风险明显降低,工程地质条件最优。
Research purposes: The comparison and selection of the project of adding second-line in Baozhong Railway will focus on the research work on the scheme of crossing the ridge in Liupan Mountains. Due to the complex geological conditions in this area, the main geologic factors of the control line program are landslide, debris flow, geological structure, high intensity seismic area, geostress, soft surrounding rock and hydrogeological conditions, and the geological alignment becomes the route through Liupan Mountain mostly according. Research conclusions: According to the geological conditions of each program, Equilibrium Slope West Project uses two special tunnels to walk through the mountainous area of bedrock of Liupanshan, avoiding the adverse geological conditions such as landslides. The tunneling project avoids the influence of main fault and the surrounding rock is lithology In a single Cretaceous formation, there are few openings and short shallow sections. In the frequent earthquake-prone Liupan Mountains, the risk of construction and operation of railway projects is significantly reduced, and the engineering geological conditions are optimal.