Risk Management Of The Railway Subgrade In Earthquake Area

With the development of economy and railway construction in China, a rapid development of construction of the railway in southwest area of our country was obtained, and at the same time, the subgrade engineering safety and management work put forward higher request. Due to the realities that there are a lot of mountains in this area and their geological conditions are very complex, more risk exist within the railway construction.Such as the construction of railway subgrade in the earthquake area, which is a very important problem. The risk of designing and building of the railway subgrade in the earthquake area takes a significant effect on the safety of the southwest railway construction and operation. But little research has been done to assess the risk of railway subgrade construction. Therefore, during the southwest railway construction, risk assessment of the railway subgrade 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 in the earthquake area. The advantages and disadvantages of common methods of risk assessment are also discussed. The sensitivity of main stability factors of the embankment and cutting slope and gravity retaining wall in the earthquake area.are analyzed using the Lizheng software. The influential trends that each factor taken to the stability are obtained, and the factors are correspondingly sorted. By using the methods of analytic hierarchy process(AHP) and expert investigation method jointly, the risk assessment analysis model of railway subgrade in the earthquake area is established, the influence of the various risk factors on the safety of railway subgrade is obtained, and some reasonable suggestions about the high risk factors are provided.Finally, taken an example of some project, this paper states basic steps and methods of the risk management and offers some proposals about the design and the construction.