Study On Subgrade Diseases Model And Prevention Measures Of Collapes Loess In Lanzhou Railway Administration

The jurisdiction of Baozhong line, Longhai line, Lanxing line in Lanzhou railway bureau,generally exists in collapsible loess subgrade. These loess subgrade in the process of operation, every rainy season subgrade will appear different degree of disease, in some cases is particularly serious, due to the economic level of construction technology limited. In recent years, with the general improvement in the future is being built orplanned construction of railway technical standards of the railway transportation.the construction will involve loess subgrade including collapsible processing problems of the foundation. Subgrade diseases causing the train running smoothness degree of variation, and sometimes even threat to traffic safety.This paper combines with the jurisdiction of Baozhong line、Longhai line、Lanxing line in Lanzhou railway bureau, generally exists in collapsible loess subgrade, to carry out the roadbed disease investigation, analysis of disease of roadbed and subgrade protection project properties. According to the properties of faced project, loess geological conditions, environmental conditions, building characteristics, superstructure and foundation design, seek indeed feasible foundation treatment measures. The main contents are as follows:(1) By reading the relevant literature on the characteristics of loess subgrade settlement, describe settlement characteristics of loess subgrade, the engineering geological characteristics of Lanzhou Railway Bureau under the jurisdiction of the Baozhong,Lanxing and Baolan line in loess area and regional evaluation.(2) Through the study of the Lanzhou Railway Bureau under the jurisdiction of the Baozhong, Lanxing and Longhai line widespread diseases of subgrade.And on this basis, analysis of the causes of diseases of railway subgrade in loess area.(3) Through the analysis of the Lanzhou Railway Bureau the jurisdiction of along various roadbed and retaining control measures.And on this basis, find out the causes of diseases of subgrade, provides the reference for theconstruction site.