新建兰渝铁路兰州至广元段滑坡危害区划研究

Research on Regionalization of Landslide Dangerous Districts along the Line from Lanzhou to Guangyuan of Newly Built Lanzhou-Chongqing Railway

研究目的:兰渝铁路是国家《中长期铁路网规划》西北西南区际间的新通道。为了在该项目的建设前更好地了解沿线地质灾害情况,做到有的放矢,为兰渝铁路的顺利建设提供技术参考,也给该地区今后的各项基础建设施工工作储备资料。研究方法:对设计线路经过位置进行大范围的调绘、勘察,结合兰州—广元段滑坡不良地质资料等研究成果,充分分析、归纳了该段线路走行范围内滑坡分布、成因上的共性及规律。研究结果:完成了兰渝铁路加深地质工作,建立了滑坡危害区划,给出了相应的工程处理对策。研究结论:对于黄土高原河谷阶地区,线路方案多以填方工程设计,滑坡影响极小;对于黄土高原沟壑梁峁区,线路方案多以隧道、桥梁工程设计,对于大型以上的滑坡多以绕避为主,对于无法绕避的,要进行预防并治理;对于构造体系交汇影响区,线路方案以隧道工程为主,大、中桥较多,绕避了大部分滑坡;对于山间河流冲击谷地区,线路方案以隧道、路基工程为主,滑坡影响较小;对于单一构造体系区,线路方案各种工程都有,滑坡影响极小。

Research purposes： Lanzhou -Chongqing Railway is a new corridor between northwest and southwest of China planned in ＂ Mid - term and Long - term Railway Network Program＂. The purposes are to better know the geological disaster situations along the railway line before the construction, provide technical reference to the construction and do the preparation work of materials for the construction of foundations in the area in the future. Research methods： Based on the information about the unfavourable geology of landslide along the line between Lanzhou and Guangyuan, the full analyses and summary are made for the distribution of landslide in the area of line passing through and for the universality and law of the cause for formation of landslide through making investigation, drawing and survey in large scale for the area of line passing through. Research results： The further work on deep knowing about geology has been completed, the regionalization of dangerous landslide dangerous districts has been established and the countermeasures for engineering treatment have been given for construction of Lanzhou - Chongqing Railway. Research conclnsions：In the most cases of building a railway line in the area of valley terrace of loess plateau, it is designed to conduct filling, on which the small influence is made by landslide. In the most cases of building a railway line in the area of gully ridge of loess plateau, it is designed to build bridges or tunnels, but the railway line should be refrained from passing through the place where there are many large - sized landslide, and the treatment should be done in advance for the place where there are many large - sized landslide and the railway line has to pass through. In the most cases of building a railway line in the intersection of structural systems, it is designed to build tunnels and large or mid - sized bridges so as to avoid most of landslides. For most cases of building a railway line in the impacting area of a river, it is designed to build tunnels and conduct subgrad landslide. In the most cases of building a railway line in the ways, on which the small influence is made by landslide. e engineering, on which the small influence is made by area of single structural system, it can be designed in many ways, on which the small influence is made by landslide.