Study On Geological Disasters And Evolvement Process In Ba Xie River Basin

Ba Xie River Basin is located in Loess plateau,the development of a wide range of geological disasters in recent years,especially in the most developed landslides and collapses,serious threat to local people's lives and property.Distribution development characteristics and evolution of geological disasters in the basin,has important implications for governance and new rural construction of geological disasters,it relies on 973 "loess soil-water interaction collapse mechanism research" in the field survey based on the laboratory and numerical simulation,analysis of the evolution of geological disasters in the study area,the results are as follows:(1)249 landslides,62 collapses,3 mudslides founded in field investgation.Landslide and collapse are classified by volume size,composition of matter and the form of motion classification.Count the number of landslides and collapses in each classification result.(2)Development Characteristics of landslide collapse region: ancient scarp mostly chair-shaped,multi-developed large landslide formed on the ancient landslide,if these huge landslides have certain external conditions,can develop into a high-speed remote landslide.On north shore,most landslides are developed in the layer of loess,or Loess-shale within the shear layer.Most of this landslides are medium and large landslide.On the south shore the landslides developed in the surface between loess and shale or developed in the inner layer of loess.Most of this landslides are medium and small landslide.The scale of landslides related in the thickness loess.Collapse developmental morphology of the study area were piled or erect,the accumulation of soil collapse like form mostly,mostly form the bedrock collapse upright shape collapses in ancient scarp and grade ? terrace scarp at the ba Xie River more development,collapse The development of the gravel layer control effect is obvious.(3)Distribution of landslide collapse study area: landslide development area along a river or ravine banded distribution,distribution differences clearly.The number of Landslides are different between north shore and south shore.On the north shore,most of landslides develop on II terraces.On the south shore,most of landslides developed on gully.Distribution of collapse performance on a region of collapse and the uneven distribution of zonal distribution along the valley.The unevenness of the collapse on the area includes the uneven distribution of the upper,middle and lower reaches of the Ba Xie River and the uneven distribution of the north and south sides.(4)Loess slope factors affect the stability of lithology,loess rock contact surface topography and hydrogeologic conditions,analyzes and summarizes the effect of each control factors.(5)The evolution process of landslide collapse in the study area is analyzed,and the numerical simulation is used to illustrate the deformation and failure characteristics of the landslide and the collapse of Chenhe village.