Study On Characteristics And Hydrodynamic Model Of Yujiaping Landslide

Yujiaping landslide is located in Yujiaping Village,Jinjiang Town,Renhe District,Panzhihua City,and the rear part of the landslide is the security airport of Panzhihua.Landslide caused the airport runway to be severely damaged and forced to stop,after which the landslide body in the rainy season under the rain should be forward creep.,A serious threat to the lower reaches of the decline in the mouth of the Aqilu community,Panzhihua Jinjiang streets and railway community residents of about8,000 people,500 million yuan of assets security,its great harm,the danger is a large level.In this paper,the geological and geologic conditions,terrain and topography,stratigraphic lithology and geological structure of Yujiaping landslide are identified through a large number of field geological surveys in the field.The hydrogeological conditions in the landslide area,including groundwater and surface water.The characteristics of Yujiaping landslide are analyzed and studied.Through the field displacement and settlement monitoring and rainfall monitoring,the influence of rainfall on landslide deformation is analyzed preliminarily.Through the field pumping and water injection test,the permeability coefficient of different rock layers is obtained.The soil water characteristic curve of the soil was measured by the indoor pressure plate method,and the data was fitted with the VG model.The soil water characteristic curve was applied to the numerical simulation analysis of unsaturated soil seepage.The shear strength of soils in landslide area under different water content was studied by the shear strength test of soil with different water content.Based on the preliminary determination of the hydrodynamic model of the landslide,the seep/w module of geostudio software is used to simulate the landslide under different hydrodynamic modes.Combined with the slope/w module,the safety factor of the landslide,The simulation results were compared with the monitoring results,and the hydrodynamic model of Yujiaping landslide was determined.The main research results are as follows:(1)Through the analysis of the characteristics of Yujiaping landslide,it is divided into three zones:the fugitive landslide(?),the landslide slip zone(?)and the landslide slip accumulation area(zone?).(2)By monitoring the statistical analysis,the rainfall rate is large,and the deformation rate of the landslide body is large,which indicates that the higher the deformation rate is,the higher the rainfall is the main factor that the Yujiaping landslide slides.(3)Through the field pumping and water injection test,it is found that the permeability coefficient of the upper and middle soils of the zone?is relatively large,and the rainwater can be kept in the upper part of the rainfall,and the permeability coefficient of the middle and lower soil is relatively small And the permeability coefficient is relatively large.The groundwater mainly flows in the bottom of the landslide and excreted in the form of spring in the front of the landslide.Variation of groundwater recharge will have a pressure on the bottom of the landslide and adversely affect the landslide.(4)The soil water characteristic curve of the soil was measured by the indoor pressure plate method,and the data were fitted with the VG model.The correlation coefficient was close to 1,indicating that the fitting effect was good and the soil water characteristic curve application of the numerical simulation analysis.(5)The linear relationship between water content and cohesion is y=-0.6968x+38.7525,and the linear relationship between water content and internal friction angle is y=-0.3143x+22.0541(6)Geostudio software was used to simulate the landslide,and different hydrodynamic models were simulated by setting different boundary conditions and material parameters.The landslide is restored to the topography before sliding,and the rainfall boundary condition is 90.0mm before the landslide.The initial water level of the landslide is obtained by steady-state analysis.The unsaturated seepage is analyzed by transient analysis.In the submerged aquifer mode,The safety factor of the landslide decreased from 1.217 to 1.189 under the influence of the rainfall of90mm,and the safety factor of the landslide decreased from 1.217 to 1.189 under the confined aquifer model.In the mixed mode of diving and confined water,the rainfall of 90mm,The simulation of the front-end blockage to produce different pressure,with the pressurized water pressure rising,the safety factor is declining,when the front-end permeability coefficient K_B reduced to 0.1 times the back-end permeability coefficient K_A,the safety factor of landslide changes close to monitoring The actual situation of the data response,and in the process of landslide caused by the front of the situation is more common,it is determined that Yujiaping landslide belongs to the diving-confined water aquifer action mode.