Hazard Assessment Of Debris Flow In The Abandoned Highway Of The Luohe River Motion Characteristics Study

In recent years,debris flow has been frequently occurring,causing serious harm.The debris flow is a kind of special mountain sudden natural disasters,with the economic and social development of the western regions,mountain residents travel demand grow with each passing day of human engineering activities intensified,affected by environmental factors and engineering construction technology conditions,waste slag produced new highway engineering geological problems piled up,become a problem that can not be ignore.Piling up unreasonable waste residue provides a great deal of material source for debris flow development.The debris flow caused by unreasonable dumping and dumping of abandoned slag is called debris flow caused by highway debris flow.With different slag type natural debris flow,debris flow is a typical man-made debris flow,wide distribution,occurs frequently in remote mountainous areas of Western China,seriously affecting the mountainous area construction activities and people's lives and property safety,has become one of the geological disasters in mountainous areas in China is an important type of.According to statistics,as of the end of 2015,only 3 of the provinces and autonomous regions in Southwest China had 247 debris flow disasters,and the direct economic losses were as high as 384 million yuan.In this paper,a flower Luohe debris flow as the research object,based on survey results collected geological data and the detail investigation of debris flow in the study area,including the frequency and size of slag source reserves and distribution,the outbreak of debris flow,debris flow parameters calculation and analysis of motion characteristics etc..The geographical environment conditions,the formation model and characteristics of debris flow and the hazard of debris from the side slope of rural road excavation on debris flow are studied.On this basis,the risk evaluation index system suitable for highway debris flow was constructed,and the risk of debris flow was evaluated by the analytic hierarchy process.The movement characteristics of the debris flow by using FLOW2 D software simulation analysis,finally summarized on the basis of the formation mechanism of Luohe highway Jen slag type debris flow,put forward highway spoil debris flow,debris flow control characteristics and scheme of Luohe flower.The main research work and achievements are as follows:(1)through the collection of hydrological,meteorological and regional geological data,combined with field investigation and Analysis on the formation of Ahualuo gully landform,provenance,water conditions,and focus on the relationship between the formation and development of the regional geological environment and engineering construction and highway spoil debris flow.(2)through field investigation combined with the material composition and the basic physical properties of indoor experiment road slag,slag calculated such source rock average and maximum block size,reserves and distribution of survey Ahualuo ditch source of loose solids,and the accumulation of accumulation characteristics of debris flow body grading analysis,Ahualuo highway slag type debris flow sources and basic characteristics.(3)combined with the source characteristics of Ahualuo highway spoil debris flow and development characteristics,analysis of formation of the slag type highway debris flow and development trend.Based on the mechanical mechanism of debris flow starting,the model and process of debris flow debris flow are analyzed on the basis of full study of the source characteristics of highway debris.(4)combined with the source characteristics of Ahualuo highway spoil debris flow and development characteristics,through comprehensive consideration of many factors related with development of debris flow in the 4 selected,as a flower level indexes of debris flow risk degree of luohe.The number of methods through the analytic hierarchy process(AHP)on the related factors affecting the risk degree of debris flows are analyzed,and the weight of each evaluation factor in making calculations,in order to construct the index system of risk level Jen slag type debris flow Luohe highway evaluation and exploration of single channel highway spoil debris flow risk assessment model for Ahualuo,hazard assessment of debris flow.(5)through the collection of research areas related to hydrological and meteorological data,using FLO-2D software for 2D flood model under different rainfall frequency(10 or 20 years,50 years,100 years and 200 years)of Jen Luohe outbreak of debris flow numerical simulation,analysis of movement patterns and characteristics of a flower Luohe the outbreak of debris flow,disaster prediction scope and scale to establish criteria for the classification of debris flow hazard grade of the study area,and obtains the research area of debris flow risk distribution map.Finally,by using the gridding numerical terrain model,the flood model after adding the rheological equation is converted into an analytical model which can simulate the rheological behavior of debris flow,and the accurate and intuitive simulation results are obtained(6)from the source and sink flow two aspects,a detailed analysis of the formation mechanism of Jen Luohe highway spoil slag type debris flow.In the topography,channel and bedrock survey based exposed conditions,combined with the failure modes and characteristics of highway spoil debris flow,which is suitable for Ahualuo prevention scheme of the debris flow ditch proposal,and the use of software modeling,intuitively the existing engineering renderings.