Risk Assessment And Decision Of The Railway Cuttings In Southwest Mountain Area

With the development of economy and society in china, a rapid development of construction of the railway in southwest area of our country was obtained. Due to the realities that there are a lot of mountains in this area and their geological conditions are very complex, the geological disasters occur frequently within the railway construction. During the railway construction in the southwest, cutting is often excavated in special and complex geographic environment, a large part of which are high and steep slopes. The risk of designing and building of the cutting section takes a significant effect on the safety of the southwest railway construction and operation. Since there are a large number of complicated factors that may determine the safety and risk in cutting segments, little research has been done to assess the risk of railway subgrade construction. Therefore, during the southwest railway construction, risk assessment of the cutting segments is very necessary to avoid engineering accidents and reduce risk loss.In this paper, an analysis of the present research situation and traditional methods of risk assessment has been done. Based on the existing methods of risk assessment of tunnel engineering, a mixed quantitative and quantitative method has been adopted according to the particular characteristics of railway subgrade construction. The advantages and disadvantages of common methods of risk assessment are also discussed. By using the methods of analytic hierarchy process and expert scoring jointly, the risk assessment analysis model of cutting sections is established, the influence of the various risk factors on the safety of cutting area is obtained, and some reasonable suggestions about the significant factors are provided.Based on the principle of orthogonal test, the sensitivity of main stability factors of cutting and anchoring slope are analyzed using the FLAC 3D finite difference software. The influential trends that each factor taken to the stability of the slope are obtained, and the factors are correspondingly sorted.Finally, taken an example of risk assessment and decision about a cutting area in a private railway project in Sichuan province, this paper addresses how to carry out risk assessment in a particular project, and proposes some constructive advises in designing and construction for the future.