Study On The Applicetion Of Passive Flexible Protection To Debris Flow Disaster Management

Two-thirds of china's land is mountainous region and hilly,especially in the central and western regions.The terrain is large,the geological structure is complicated.It is easy to occur with heavy debris flow,landslide,landslip and other major geological disasters,a serious threat to the people's lives and property safety and transportation safety.As the unique advantages of the passive flexible protection in the aspects of safety,economy,environmental protection,the application of passive flexible protection,in the prevention slope hazard,is more and more widely.more and more researches on the rock impacts passive flexible protection.In recent years,passive flexible protection has been gradually introduced into the interception of debris flow,but for its research on the interception of debris flow is relatively rare,the load form for debris flow and rockfall impacts passive flexible protection is different,the dynamic response is not the same.Therefore,this paper studies the interception effect,damage type and basic design of passive flexible protection to intercept debris flow.The main research contents is as follows:(1)This paper conducts a field investigation for the interception of debris flow for eight VX-100 flexible protection systems in217 and 216 provincial roads of Sichuan from Litang County to Yading in Daocheng County.Draw up the investigation plan,carry on the qualitative and the quantitative investigation through the observation method and the experimental method,To clarify the basic situation.The interception performance and main failure types are analyzed,which provides the basis for the improvement measures and the basic design of the debris flow flexible protection structure.(2)Although the debris flow flexible protection system has good interception performance,But there are different types and different degrees of damage to local components,Analysis of failure of debris flow flexible protection structure,and put forward the improvement scheme and design countermeasures according to the main failure types,provide a reference value for the engineering application of debris flow flexible protection system to achieve the interception effect better.(3)The basic design principles and methods of the flexible protective structure of the debris flow are analyzed,the basic failure modes and the failure mechanism are pointed out,and the influencing factors of the foundation damage are summarized.Based on the field investigation and the basic design principle of the building structure.The calculation formula of pile pier strength,sliding friction between pile pier and soil,soil shear failure,gully bed erosion depth of foundation is proposed.These formulas provide a theoretical basis for the design of debris flow flexible protection structure.(4)Study the construction procedures and methods of the flexible protective structure of the debris flow,and put forward the construction precautions:it is necessary to ensure the installation quantity and position of the pressure reducing ring are correct;pay attention to the construction safety.