Risk Assessment Of Luding Highway Interchange Under Wu Li Debris Flow

Luding highway Interchange is an important part of the Ya’an to Kangding Highway Traffic conversion services。it is also an important protection late Erlangshan super specialty tunnel safety operations. According to the comprehensive consideration,the interchange project Located in alpine gorge area and need to go through two Debris flow valleys.The risk assessment on the debris flow valleys plays a crucial role to the site selection of Luding highway Interchange and discarded soil field. Because there are a lot of highway and railway will be constructed in Alpine Valley area,where Space is limited and Geological disasters developed. Therefore,how to choose position of the discarded soil field and control the two debris flow valleys is the key problem to these projects.This paper studies the highway design process by considering the hydrological and geological conditions,assessing the risk of the dam and Interchange project in two states.The paper gives a reasonable engineering design proposal in this way.In this paper, the outcome of institute can be to further improve design methods of discarded soil field,as well as providing a reference and guide for local disaster prevention and construction.The following understanding has been summarized:(1) This paper achieves the assessment of the Wuli debris flow by considering a variety of influencing factors,such as a detailed research on the regional geological background,the topography, vegetation, climate.The Quantified score of Wuli main ditch is 80 and Wuli tributary gets 72,which means that the debris flow is prone to outburst.(2)This paper utilizes field investigation and remote sensing images to analys the switch condition.The consequence shows that Wuli flow debris valley under generous topography and extreme rainfall conditions is more prone to occurring flow debris.(3) Regarding to scene survey data and the relevant norms, the study calculates values of the main features to Wuli flow debris. The peak debris flow is 237.599m3/s.The impact force of large stone is 2302.19 k N.The gaining height can value to 2.024 m.(4) This paper uses analogy to analyzing bridge pier hazard under flow debris. It calculated the maximum impact force which piers can hold out is 2636 k N.It is greater than the impact force of large stones.But lot stones entrained by debris flow will impact the pier several times in a short time,which could have caused devastating damage to piers.(5) Through establishing a digital Model of the dam,considering extreme case conditions which contains heavy rain and earthquake,the paper study the dynamic response of the dam with flac3 d.According to the simulation calculation,the dam under heavy rain ande earthquake is unstable and prone to overall instability.It is dangerous to the Ya’an to Kangding highway.(6) By analyzing the effectiveness of the dam which has been controlled, compared to engineering measures, this paper gives further recommendations to the highway design.