Study On Deformation And Failure Characteristics And Stability Of Landslide In Limestone Area

The geological environment of Zhenba county in Qinba mountain area is complex,the perennial rainfall is large,and geological disasters occur frequently,especially the number of landslides is much higher than that of landslides and debris flows.Taking Zhenba landslide of Zhenba area in the limestone area as the study area,the deformation and failure characteristics,and different types of typical landslide slope stability analysis by numerical simulation,the main research methods and results were as follows:(1)Through detailed field geological survey,the landslides in the study area were divided into rock landslide and soil landslide,and 70 surveyed landslide points in the study area were taken as samples to calculate the number and percentage of each type of landslide.It can be seen from the statistics that the number of downslope was the largest,followed by the reverse slope,the syncline slope,and the anticline slope phase was similar.(2)Summarizes the landslide disaster in the study area,according to the material composition,movement form and landslide section morphology,it is concluded that the study area soil landslide plane form is given priority to with semicircle and tongue,is given priority to with stepped and concave profile form and motion forms is given priority to with time type,however,rocky landslide plane form is given priority to with irregular and semicircle,profile shape is given priority to with complex shape and rectilinear,movement form is given priority to with traction(3)The structure of the various types of landslides in the study area type and failure modes are summarized,combined with the engineering geological conditions in the study area and the characteristics of slope structure,set up the earthiness landslides in the study area and a generalized model of rock landslides,the weight is only considered as well as natural conditions,the numerical simulation,through the analysis of the slope displacement,stress and plastic zone development characteristics,to verify the field survey results.(4)Combined with the engineering geological conditions and the characteristics of deformation and failure in the study area,the use of Midas GTS simulation software of two typical landslide stability coefficient and instability of damage simulation calculation with the finite element strength subtraction,compared to two kinds of working conditions of strain field,stress field and displacement of landslide do detailed analysis,and calculate the stability coefficient.The stability coefficient of soil landslide under natural condition is 1.64,rock landslide stability coefficient is 1.70,soil landslide stability coefficient is 1.03,rock landslide stability coefficient is 1.05.The results show that the landslide tends to be stable under natural conditions and unstable ? unstable under heavy rain conditions.The landslide deformation is large under the condition of heavy rain,so it is necessary to deal with the landslide in time and formulate the corresponding prevention measures.