Area Threated By Ddebris Flow’s Study On Optimal Layout Of Highway And Prevention And Cure Of The Disaster

With its full closed,full interchange,divided by the high level of the cars,highway promotes the rapid development of the national economy.The infrastructure of Western China is relatively backward,so it is necessary to speed up the construction of highway in this area.In the past,our country is mainly based on the terrain route design of highway,paying insufficient attention to geological disasters.In the new era,we should pay more attention to the geological hazard to optimize the layout of highway,basing on geological route selection.Dongchuan is located in the northeastern Yunnan fault zone,geological hazard happens frequently,and there is a typical debris flow disaster.The impact of debris flow and other geological disasters must be considered in the selection of the Gongdong highway route,and integrated prevention and control of debris flow ditch should be taken,exploring a reliable route selection,debris flow disaster’s prevention and control model for the construction of similar areas in the western region.This paper is relyed on the the Gongdong highway to study the optimal layout and disaster prevention and cure of area threatened by debris flow,making geological route selection basing on geological hazards specially debris flow.This paper discusses the evaluation of debris flow risk in order to optimize the layout of highway,and studies on the comprehensive prevention and control of Xiaobaini ditch combined with the route selection.This paper is mainly divided into two parts,the first part is the Gongdong high speed ratio from geological route selection.Firstly the paper studies the geological disaster especially debris flow disaster in Xiaojiang River basin,especially the environmental characteristics and distribution of debris flow.Then the principle and key points of geological route selection are established,making comparing routes’ primary selection and evaluating risk of debris flow.The danger of debris flow ditch is evaluated.Taking the Xiaobaini ditch route as an example to evaluate vulnerability of comparing routes’ infrastructure.Finally,an example is analyzed.Combining the risk assessment of debris flow to optimize the layout of the route.Xiaobaini debris flow route located in the C route threats directly C route and LongDongge road,and indirectly K route.Therefore,the second part of the paper studies comprehensive prevention and control of Xiaobaini ditch,which is a typical debris flow ditch.First of all,the comprehensive prevention and control mode of debris flow ditch and the damage of prevention and control structure are analyzed,The formation conditions and the characteristics of debris flow are also studied,mastering the basic data of prevention and control.Next,the prevention and control of the clear water zone,the formation zone,the circulation zone and the accumulation zone of the white mud ditch are studied.Then it designs prevention and control structure that is compatible with this basin according to its damage in Dongchuan,and a new type of sand retaining dam is designed.Further checkings tability of check dam engineering and stability and economic benefit analysis of the new sand retaining dam are made so as to achieve the purpose of comprehensive prevention and control of Xiaobaini debris flow to ensure the safety of highway bridges downstream,eliminate the hidden danger of blocking Xiaojiang River.