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 Iine 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 conclusions : 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 subgrade engineering, on which the small influence is made by landslide. In the most cases of building a railway line in the area of single structural system, it can be designed in many ways, on which the small influence is made by landslide.
2007, Vol. 24 
