Vulnerability Assessment Of The Highway Prevention Project Of Debris Flow

Highway plays an important role in transportation, and debris flow has seriously affected the normal operation of highway and road safety. China, whose mountain land area accounts for about two-thirds of its land area, is one of the wider distributions of debris flow and more serious national disaster in the world. Highway, as linear structures, unavoidable have to pass through various types of geomorphic unit, is involved in complex geological and topographical conditions, and is subjected to the threat of disasters. It caused some situations in western China under the interaction between natural factors and human activities, like wide spread landslides, diverse type; activity frequently, and serious disaster. In,recent decades, debris flow caused direct economic losses as much as several hundred million dollars average. Bridge, culvert and preventive engineering suffered serious disfigure. Debris flow is regional, and highway is linear, but the damage on the road by debris flow is point, so the influence will be in the linear and external aspect: Therefore, carrying out the vulnerability assessment on road debris flow control works not only can be aware of the counter-disaster ability of it and also can show great significance on improving the counter-disaster ability of it.This thesis, to the debris flow control works of G212 Longnan section, Yunnan S207 Dongchuan section, and Bomi-the south line of Sichuan-Tibet Highway to Lhasa as the basis, road to debris flow vulnerability assessment and prevention project grading classification as the main content, focus on the following aspects.Firstly, this thesis does an investigation on the development of the debris flow's internal and external dynamic conditions on the basis project regional, and also discusses the role in the formation of the debris flow and its characteristics. According to research needs, they proposed the road debris flow field research methods. And on the basis of the field investigation on debris flow control work, there are some impact factors of the damage have been analyzed.Secondly, on the basis of previous studies, they discussed the type and the applicability of the road debris flow control works. From the actual research, they proposed five integrated control model of debris flow. And they also make some analysis on its feasibility and its rationality. At the same time, they raised some biological measure of debris flow prevention, like forest engineering, animal husbandry measures, agriculture measures and so on. On the basis of the diagnoses of the control works, they explore the different types of damage control works and their causes which can offer the basis selection for the vulnerability evaluation.At last, based on the control works damage causes analysis, and followed the systematic principle, objective principle; dominant principle, optimize principle, practicability principle, and desirable principle, they can select the control works vulnerability norm, construct the highway vulnerability evaluation index system, and divide evaluation level. They also can select the secondary blurring comprehensive evaluation based on the AHP analysis, and then establish the road debris flow vulnerability assessment control model. Using these, they make the vulnerability assessment on the bridge, culvert construction, aqueduct engineering which they did research.On this basis, they select the BP artificial neural network ANN to construct the Control Engineering Vulnerability Index Prediction Model, and use culvert works as a training sample to do the research on the network, and then finally obtain the stably network structure and parameters. And based on this network, they will do some extrapolation prediction on some samples which are not trained.