Stability Analysis Under The Loading Of Rainfall On Huang Tupo Landslide And Optimizated Design Of Treatment With Double Slip Plane Slope

The three Gorges reservoir area because of its special water geographicalenvironment and the flood season rainfall and other factors affecting, is the frequentoccurrence zone of the landslide geological disaster, the reservoir area landslide type ismainly the accumulation landslide, and under the influence of the long-term geologicaltectonic movement and other conditions, appearing the double and even multilayersliding landslide. The rainfall induced slope instability is widespread throughout theworld, this kind of landslide research also is many, but most of the scholars’ research isfocused on the landslide phenomenon of the single deposit slope caused by the rainfalleffect, the research of the double sliding surface slope is rarely. Therefore, it isnecessary to strengthen the research of the stability evolution law of the double slidingslope under the condition of the rainfall loaded, and also provides the theoretical basisfor the prophylaxis and treatment of this type of landslide.This article takes the national natural science fund and the specialized researchfund for the ministry of education as the backing, takes the three Gorges reservoir areatypical double sliding slope, Huang Tu Po Lin jiang Ⅰcollapse landslide body as theresearch object, establishes the generalized model of the double sliding slope, applyingthe geotechnical engineering software Geo-studio by the different rainfall conditionloading to make the numerical simulation analysis of the stability evolution law of theshallow and deep slope body of the double sliding slope, and optimizing the design ofthe prophylaxis and treatment of the double sliding slope, getting some cognitionsduring the process of the research:1、By collecting the related data and the research result of the three Gorgesreservoir area typical accumulation landslide, analyzing and getting to know the basiccharacteristics and the water environment dynamic characteristics of the accumulationlandslide;2、Through the research of different rainfall factors and occurrence of debrislandslide in relationship to each other,realized that different conditions have differentinfluence to landslip,duration of rainfall,Rainfall intensity and so on all have influenceon the stability of debris landslide;3、The article uses the finite element analysis software Geo-studio and saturated-unsaturated seepage theory,The loess landslides based of the generalized model fornumerical simulation，simulation is the main law analysis of influence by the differentrainfall duration and rainfall intensity on double sliding slope stability. The articledivided into four kinds of rainfall loading:Short time rain,long time rain, short timeheavy rain,long time heavy rain.4、Through numerical simulation of double sliding stability of slope under differentrainfall load conditions:short light rain has little impact on the stability of the doublesliding slope, long time rain and short supply of the heavy rain of shallow sliding massof double sliding slope stability influence have more obvious, that is shallow slidingmass of the two kinds of rainfall conditions is more sensitive, it is harmful to the shallow sliding mass of double sliding slope,prone to shallow sliding body losesstability.It often occurred in the long rain rain,that makes the whole loading conditionof double sliding slope reaches saturation, the stability coefficient has obviouslydecreased, and finally tends to be stable, And the deep sliding body more susceptible tofailure.5、This paper adopt reinforced concrete retaining wall and vertical prestressedanchor rod retaining wall supporting structure to the role of joint governance doublesliding slope; Through establish the calculation model of double slidingslope.According to the Kulun earth pressure theory to calculate the active earth pressureof double sliding bodies and static soil pressure.Based on the composite retaining wallagainst sliding and overturning resistance of the overall stability checking,Because of itsgovernance depends on the slope of prestressed anchor rod anchor role to achieve theability to resist overturning,The shearing strength of the bolt to meet their slidingresistance.Applying prestress calculation of prestressed anchor,and get the unit lengthbolt on retaining wall under shear,In order to get the bolt retaining wall needs to set thenumber of unit length.Through the field of landslide anchor rod pull-out test,radiusfunnel effect to determine the critical anchorage depth and prestress anchor pullout testOptimization of prestressed anchor spacing,To achieve safety, economic of landslide.