宝中铁路增建二线六盘山区工程地质选线

Engineering Geological Alignment of Extended Second Line of Baoji-Zhongwei Railway in Liupan Mountain Area

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 study on the schemes for the railway passing the Liupan mountain area is crucial to the selection of the schemes for the extended second line of Baoji - Zhongwei Railway. As the geological condition of this area is complex, the geological factors of controlling the railway line schemes involves in the many geological conditions, such as the landslide, debris flow, geological structure, seismic region, high ground stress, the soft tunnel wall rock and hydrogeological conditions. The engineering geological alignment is crucial to the scheme for railway passing through the Liupan mountain area.Research conclusions： From the comparison of the geological conditions of the various schemes, it is concluded that with the west slope equalization scheme of building two extra - long tunnel through Liupan mountain area, the railway and tunnel can keep away from the area with unfavorable geological condition and the main fault zone, and the tunnel wall is of single lithology cretaceous stratum with less portal and short shallow section. In this way, the risks of construction and operation of the railway in the Liupan mountain area where earthquake occurs frequently are much cut, and the engineering geological condition is optimal.