| Xiaqu Basin is located in the eastern segment of The Nyenqing Tanggula Mountain in Tibet Autonomous Region,between 30°27 ’-30 °56’NORTH latitude and 93°35 ’-94 °39’ East longitude.The overall shape of Xiaqu Basin is "Y" shaped.The main stream is 82 km long,with high mountains and deep valleys,steep terrain and glacier landform development.In this paper,using field investigation and visit,aerial drones,indoor experiment and numerical simulation methods to analyze chardonnay qu river debris slope area and research,clarify the chardonnay qu basin SLATE of the distribution and characteristics of debris slope,reveals the chardonnay qu basin SLATE debris slope on the cause of the distribution,and through the risk analysis and numerical simulation of debris slope stability were calculated.The research results can be used to prevent and control the debris slope along the highway in Xiaqu valley.The main conclusions are as follows:1.Xiaqu Watershed covers an area of about 2952 km2,with 28 debris slopes distributed along both sides of the highway.Debris slope disaster has a great impact on vehicle passage along the road.The reason for the concentration of clastic slopes in chardonnay basin is determined by the characteristics of SLATE.2.There are two developmental patterns of grooves in the source area of SLATE clastic slope in Xiaqu Basin: leaf shape pattern and drop shape pattern.There are three developmental stages in the clastic slope circulation area of xiaqu Basin: juvenile stage,mature stage and old stage.The accumulation area of SLATE clastic slope in Xiaqu basin is similar to landslide structure.The slope of source area,circulation area and accumulation area has great influence on the development of clastic slope in Xiaqu basin,and the slope of circulation area can even be used to judge the development period of clastic slope.3.Among the factors affecting the risk of detrital slope in Xiaqu Basin,the most influential factor is the volume of detrital slope,followed by the area of provenance,the height of detrital slope,the slope of accumulation area,the vegetation coverage of detrital slope and whether it threatens roads.Through numerical simulation,it is found that under natural conditions,the safety factor increases by about 0.2% after retaining structures such as retaining wall are built at the Angle of debris slope.Therefore,the stability of debris slope can be improved by building retaining structures such as retaining wall at the Angle of debris slope.For the control scheme of debris slope in Xiaqu basin,a corresponding control mode can be formed,that is,the risk level of debris slope can be determined by discriminating and classifying the risk,and then the corresponding control measures can be adopted according to the corresponding level. |
