宝中铁路增建二线六盘山越岭地质选线

Alignment of Additional Second-line of Baoji-Zhongwei Railway in Liupanshan Mountain Summit Area

研究目的:宝鸡至中卫铁路增建二线须穿越的六盘山地区地层结构特殊,断裂构造发育,滑坡泥石流等不良地质较多,地质非常复杂,研究这些控制线路方案的特殊地层、不良地质及区域地质构造,提出具有针对性的地质选线建议供方案研究参考。研究结论:越岭地段一般地层复杂,不良地质发育,区域性地质构造比较集中,线路方案受地质条件控制。确定线路越岭方案前必须对线路可能通过区域进行大面积地质普查,初步查明区域内地层、不良地质及区域构造的分布及发育情况,然后进行多方案技术、经济比选。通过研究工作,线路避开了特殊地层及不良地质发育地段,绕避了区域大断层,明显改善了越岭区长隧道的工程地质条件和技术条件。

Research purposes： The additional second - line of the Baoji - Zhongwei Railway has to pass the Liupanshan Mountain area with the special stratum structure and the complicated and unfavorable geological conditions of development of fault structure and lots of landslides and debris flows. This paper studies the special stratum and the geological structure in the unfavorable geological condition area where the railway will pass in plan and proposes the alignment recommendations for the reference. Research conclusions：The mountain summit area is generally featured with the complicated stratum, the development of unfavorable geology and concentration of the regional geological structure. The railway alignment in this area is limited by the geological condition. Before determination of the alignment, the reconnaissance survey should be done in large range for the area where the railway probably passes in order to know the distribution and development situations of the stratum, the unfavorable geological conditions and regional geological structure, and the comparison should be made for optional plans in technology and economics. By doing these works, the railway can keep away from the special stratum, unfavorable geological area and big fault zone to improve the engineering geological condition and technical condition of the large tunnel in mountain summit area.