The Impact Of Vegetation On The Genesis Characteristics Of Debris Flow That On Line Domain Engineering And Disaster-bear Pattern Study

Abstract:Debris floes were widespread and cause serious harm in our country,especially harm to transport Camp security in line engineering,such as roads, railways.The currently existing norms at home and abroad lack of the vegetation systematically impact to debris flows,so that the ecological prevention and control of engineering lack of reliable basis. In Guangzhou to Lechang highway as the research area, the debris flow of the vegetation in the process of impact is analysised and ecological prevention and control measures are suggested, in this paper, the main work and research results were as follows:(1) Based on investigation of many debris flows along Leguang highway and the collection of basic data, analysis the role of the vegetation in the debris flow subsquently environment, focus on the role of vegetation to debris flow disaster suppression provenance and water constraints.(2) Based on the existing research on the role of vegetation to debris flow formation conditions and the activities, the paper discussed the role of vegetation in debris flow development and the influence of mechanical properties in the evolution process of analysis by taking example of the dayaoshan tunnel debris flow disaster. Based on the friction mechanics theory, Build a reinforced effect of root spreadsheet, calculates reinforcement force of fir to debris flows provenance.(3) For site investigation of phenomenon of the pine tree is not damage, the paper builds the pine trees on debris flow provenance plaxis finite element model of the role of reinforcement, simulates the pine root growth direction and the source tree spacing reinforcement effect. The numerical analysis results show that the vertical slope root growth effect is best. At the same time the paper gets the reinforcement effect best conifers distance threshold.(4) For the phenomena of debris flow shallow root bamboo piece damage in the study area, the thesis, considering the wind load, got the conclusion of the bamboo under the effect of the typhoon heavy rain will accelerate the crack propagation and failure mechanism of rainfall infiltration and the debris flow starts, by consulting the mud pumping of roadbed disease.(5) The paper analysis and summary of vegetation under the influence of debris flow model of bridge engineering and puts forward the vegetation in debris flow and debris flow disaster mitigation effect in the process of change of hazard-affected chain effect. For Leguang high-speed landslide engineering research area, the paper provides the mud-rock flow prevention and control of ecological suggestions and the certain theory basis for the debris flow disaster prevention and mitigation disasters.