In Loess Ravine Terrain Bridge Foundation Structure Evolution Law And Risk Management During The Operation

With the rapid development of modern construction, bridge construction in our country got the unprecedented development opportunity. At this stage of the northwest mountain bridge, often attaches great importance to the construction phase of the safety and economy,and Bridges during the operation of all sorts of problems and didn’t get the attention it deserves. Loess ravine terrain structure of bridge foundation in all sorts of problems exposed during the operation, such as exposed soil pile, the pile foundation subsidence and erosion, caused by bridge deck drainage and rainfall concentrated on pile foundation scour,empty strap, cone slope abutment of subsidence problems, due to the mountainous Bridges during the operation of disasters didn’t get the attention and effective solutions, Bridges, in the wake of a operational safety risk tends to cause a huge amount of maintenance costs.Thesis on the basis of research results at home and abroad for reference, the lower part of bridge structure in northwest loess region wide range of research, and with the aid of entropy theory to the construction in the loess gully topography evolution law risk analysis on the risk of bridge foundation, on the basis of making management methods discussed in this paper. Paper main research content is as follows:First of all, on the northwest loess ravine terrain bridge lower part structure during the operation of various disasters for a wide range of research, to do system common disease classification, and then deeply analyses the characteristics of the cause of the diseases and disasters, on the basis of the established during the operating risk of bridge foundation in loess ravine terrain system, and analyze the characteristics and dynamic mechanism of risk system.Second, in disease research and risk system based on the analysis of the characteristics and dynamic mechanism using the entropy theory to establish the loess ravine terrain during the operating risk of bridge foundation evolution law research methods.Finally, the risk is based on the study of the evolution law, adapted to the bridge foundation in loess ravine terrain structure multi-level protection strategy, improve the level of safety performance and operation of the bridge.In loess ravine terrain operations during the bridge foundation risk evolution law and protection management study is very necessary, the paper research the northwest region of our country mountainous area of typical existing highway concrete Bridges have important guiding significance to the safe operation and management, at the same time, the planning and design of mountainous highway Bridges in the future has reference and guiding role.