Study On The Causes And Prevention Of Debris Flow In Longtangshan Area,Yunnan Province

The debris flow basin of the Shabagou in Longtangshan,Longling County is affected by regional faults,magmatic rock activities,neotectonic movements,external dynamic geological processes,and special geological,geomorphological,climatic,geotechnical conditions,earthquakes,and human engineering activities.The status quo has seriously restricted the pace of construction of Dayakou Village towards red tourist towns and ecological townships.This paper takes the debris flow disaster of Shabagou in Longtangshan area of Longling County,western Yunnan as the research object.After conducting comprehensive geological exploration in the field,it analyzes the geological conditions,the status of geological disasters and the causes of geological disasters in the study area.Based on the geological data and historical records of the area,the characteristics of debris flow hazards in the study area were analyzed and evaluated,and the parameters of a debris flow were calculated in detail.Finally,a complete control project was proposed as a reference.The main work and research results are as follows:(1)The study area is affected by factors such as regional structure,magmatic rock activity,unloading and earthquake,and other factors such as earthquake and human engineering activities,resulting in the development of various geological disasters.(2)Through comprehensive analysis and research,it is concluded that the main source of debris flow in Shabagou is landslide,which belongs to storm-valley,thin,high-frequency and development period debris flow,and its movement characteristics are motility and sorting.The risk level of debris flow is large;the intensity of activity is “strong”,which is a type of debris flow that is urgently controlled by Class I.(3)The debris flow path of Shabagou in Longtangshan is wide,the thickness of loose accumulation layer is large,the depth of pore water is shallow,and the water volume is large.The traditional intercepting dam foundation is difficult to meet the bearing capacity requirements of the dam,and the foundation construction is greatly affected by groundwater.The sub-governance research proposes the use of pile-based caps as the basic form of retaining dams,which can provide certain reference value for the design of such debris-drainage disaster control schemes with certain commonalities.