| Landslide is one of the common geological disasters in nature,and its occurrence mechanism,geological geomorphology,weather,hydrology and so on.Landslides not only pose a great threat to human life and public property.This paper takes Lidongcun landslide geological survey in Lishui City as an object to investigate the surrounding regional environment,geographical traffic,hydrology and landform.The geological hazard characteristics of HP1 landslide were investigated,the conditions and inducing factors of landslide formation were found out,and the mechanism of landslide formation was analyzed.Combined with the influence of slope infiltration under numerical simulation of rainfall condition,the macroscopic analysis of landslide stability,the analysis and evaluation of physical and mechanical parameters of landslide rock and soil mass,and the selection of parameters for landslide stability are discussed.Qualitative calculation and evaluation as well as slope stability evaluation are carried out,and suggestions for landslide prevention and control are put forward.The landslide exploration in Lidongcun has been integrated into engineering survey,engineering geological mapping,drilling,geophysical exploration,sampling and testing to investigate the geological conditions of the landslide area.The geological conditions of landslide exploration are of complex type,in which the HP1 of Lidongcun landslide is a bedded rock landslide,the plane shape is similar to that of a chair,the scale is medium,and the forming mechanism of landslide deformation and the influencing factors of its stability are found out.The Lidong landslide is located at the intersection of the structure and the influence of fault structure is the controlling factor of landslide formation.The landslide body HP1 has mostly declined and the accumulation of deposits has accumulated at the foot of the slope,which naturally achieves the effect of cutting the top and pressing the foot and is in a stable state as a whole.The slope south of HP1 slope has a good overall stability,with only a large thickness of the soil layer,loose structure and poor stability,and the slope of the tunnel entrance emergency side slope is poor in stability and prone to collapse.The influence of transient seepage of Rain Water infiltration on the stress and strain of soil slope is studied by using Midas/GTS finite element software and numerical simulation of slope infiltration under rainfall condition.Under the influence of rainfall,on the one hand,the pore water pressure of rock and soil mass increases sharply and the friction coefficient of potential sliding surface decreases,the effective stress of rock and soil reduces,and the anti-slide force decreases;on the other hand,the seepage field is formed in the slope body.Increase slope sliding force.The horizontal displacement,the total displacement,the maximum shear strain and the equivalent strain all increased to some extent,and the stability coefficient decreased obviously.The stability coefficient was 1.537 under the condition of no rainfall.The stability coefficient of the slope is 0.967 under the working condition,and the slope is unstable,so it is necessary to support the slope. |
PDF Full Text Request