Discussion On Characteristics And Stability Evaluation Methods Of Argillaceous Landslides In Paleozoic In Zhaotong Area

Landslide is one of the more serious geological disasters,it often causes traffic interruption,rivers blocking,villages covering,and brings great threat to people’s life and property security.The author preliminary mastered the research status and methods according to collecting the home and abroad research of literature,which is about the landslide soil physical and mechanical properties.It has been clear about the shortcomings existing in the research of landslide soil engineering properties,namely,many scholars carried out extensive and in-depth research and discussion about the landslide soil,but the study of regional special landslide soil did not achieve satisfactory degree.That is unable to meet current and future demand for a regional geological hazard prevention and control work.Therefore,this paper takes the palaeozoic group pelite rock(Mudstone.Clay rock.Shale.Slate)soft easy to slide in the composition of rock and soil mass special landslide in Zhaotong area as the research object.Through the data collecting,field investigating,indoor physical mechanics testing to analyse the pelite rock landslide soil engineering characteristics.That will be conducive to perfect and improve the level of landslide soil theory and practice,there are both academic significance and guiding significance of disaster prevention and reduction.The paper obtained the main research results as follows:(1)According to the position of sliding surface、mechanical properties、the rock mass structure、the landslide scale、joints and fissures to categorize the pelite rock landslide occurrence,lay a foundation to study landslide formation conditions.Statistics,The number of landslide development in fully weathered layer and strongly weathered layer interface is most,accounted for 71.1%.The pelite rock landslides in the majority with small traction type.Artificial slope cutting to pelite rock medium weathered layer in slope number accounts for more than 90%of the slope,and artificial slope cutting to strongly weathered layer probability compared with smaller,accounts for only about 60%.(2)According to the statistics analysis of Palaeozoic group pelite rock’s physical and mechanical index in the studied area,the cohesive force and internal friction angle of the fully weathered pelite rock is lesser compared with strongly weathered.moisture content,void ration is larger;the internal friction angle will reduce with the moisture content,it presents good negative correlation relationship.(3)Establishing 3D slope model with the typical pelite rock landslide in the study area to analyse its stability,combined with the quantitative evaluation method of comprehensive evaluation.After that,using the limit equilibrium to verify the availability of the 3D method.As a result,the limit equilibrium calculate the safety factor should be safe,for all of this is because the reason is the FLAC3D to simulate the sliding slope unstability is more real,more resistance close to actual.(4)From topography and geomorphology.geological structure,rock and soil property and structure,surface water and groundwater,artificial slope cutting four aspects to discuss the Paleozoic in the study area pelite rock landslide forming conditions,and according to the result of calculating to design the prevention methods.