Study On Characteristics And Mechanism Of Loess Landslides In Big Xi An Area

"13th Five-Year" period is a key period for the construction of Xi'an metropolis started,Xi'an's construction of a wide range of complex topography,and the population density in this area is relatively high and human engineering activities,high strength,will cause the extensive development of landslide.In the landslide disaster of the great Xi'an area,the loess landslide is particularly prominent,affecting the development of the regional economy and the safety of people's lives and property,which makes the relevant research of this kind of landslide is of great significance.The Loess Landslide in Xi'an area as the research object,through field geological survey,indoor data collection,analysis of the characteristics and influencing factors of typical loess landslides in the study area,summarizes the temporal and spatial distribution of loess landslide;the physical and mechanical properties of landslide soil indoor test;typical loess landslide in the natural conditions,the heavy rain is calculated by the finite element software,the deformation and failure features of loess landslide analysis,puts forward the model and failure mechanism of loess landslide in Xi'an area.The following results are obtained through research:(1)Based on the landslide data collected in the greater Xi'an area,the distribution and characteristics of the Loess Landslides in the area are analyzed by field investigation.From the aspects of topography,geomorphology,rainfall,geological structure,earthquake and human engineering activities,the paper analyzes the effect of loess landslide,and summarizes the influencing factors of typical loess landslide in great Xi'an area.(2)Experimental study on influence of water content on soil density,internal friction angle and cohesion by soil physical mechanics;through the conventional three axis test of loess,analyzed the stress-strain relationship under different moisture content of loess under different confining pressure.(3)Based on the typical loess landslide mapping and exploration,combined with laboratory test results,using finite element software to establish two-dimensional numerical model of loess landslide,loess landslide stability in natural and heavy rain condition calculation,deformation characteristics of typical loess landslide analysis.(4)The Loess Landslide in Xi'an area are summarized,the Loess Landslide in Xi'an area as the "tension shear slip" mechanism of deformation and destruction,the "tension-weak structural plane shear mode" and "tension-homogeneous shear mode" two modes.