Research On The Dynamic Response Under Severe Earthquake Of Weiganliang Slope In Qingchuan County

5·12Wenchuan earthquake induced a large number of mountain cracking or evendynamic instability,then a large-scale prototype testing ground appeared in the strongearthquake area venues.Through analysing research data about earthquake triggered slumpand other geological disasters,the author found that the deformation and fracture of theisolated thin strip ridge,multiple free surfaces hill body and slope gradient changing pointswere exceptionally strong and showed certain regularity.It shows that the law of motionDynamic Response.Then,the dynamic stability and dynamic response of the high intensityregions in the mountain and canyon slopes.are protuberant problems.This paper set Qingchuan Weiganliang slope as an example,and make the study slopwhich effected by512earthquake as an1:1natural prototype testing ground.Base on thedynamic background of the regional geological structure and the study area geologicalenvironment conditions and other information and through depth investigation and study,thispaper has analyzed and discussed the deformation and failure characteristics in the studyarea,the slope structural division and earthquake.This paper has analyzed seismic dynamicresponse characteristics,according to the role of the basic characteristics of the Wenchuanearthquake and seismic forces,and combined with the general slope dynamic responseanalysis of influencing factors and summary.Using the finite difference model to analyze theslope of the dynamic response under earthquake and confirming the rupture characteristics ofthe deformation of the slope and from the perspective of the stress-strain,based onthese,concluded a comprehensive analysis of the dynamic response of the law in the studyarea slopes.This paper mainly use the strength reduction of the limit equilibrium theory andnonlinear theory of dynamic stability of slopes to analyze and evaluate the dynamic stabilityof slopes.(1)The Weiganliang slope is steeply inclined forward layered slope,which is located in athin strip isolated mountain north slope.Control by topography,the structural characteristics of the slope and along steep slopes-crack the extent of bending in the historical evolution offactors,the slope has obvious regional characteristics.There is a certain regularity deformationand fracture of the slopes under the strong earthquake,that the top of the hill circle arc-shapedcrack deform extremely strong.There are some differences among the different sub-areasslopes deformation and fracture of degree under earthquake,but dynamic responsecharacteristics presents certain similarity in general.The earthquake show little effect to theslopes in the lower part of the accumulation of deformation and fracture, and in a sense,thereis a direct relationship between the slope of ground motion response characteristics and theslope structure,topography and lithology combination of factors.(2)Main epicenter in Wenchuan,the lack of slopes near the epicenter of the vibrationmonitoring section and the lack of in-depth understanding of the dynamic response of theslopes,and thus the vibration response of influencing factors combined with the general slopeWeiganliang slope deformation and fracture characteristics and strong aftershocks in theearthquake,Weiganliang slope vibration monitoring data,the dynamic response of the thinstrip isolated mountain.Weiganliang slope of rock and soil under earthquake seismic loadingcycle of tension and compression in the top of the hill to a large number of crack-the wrongshock cracks.Slope shock fracture development and distribution is characterized by a certaindynamic response regularity.The topography of the slope development and distributioncharacteristics of the earthquake cracks elevation amplification effect.Slope structure on thedynamic response characteristics of the control,slope slope table earthquake cracks developedat the top of the hill and slope to the point of gradient change parts,and the accumulation offracture development in less.Earthquake slope PGA amplification factor with elevation toshow the level of overhead and vertical amplification effect;the PGA amplification factor inthe level of overhead (NS) than vertical (UD) to large.(3)Using finite difference FLAC3Dsoftware,does each region area of slope for numericalcomputation.From the dynamic response process curve of slope,we can conclude thathorizontal displacement of slope appears some regularity,the maximal displacement appearedin the top area nearby,show the maximal displacement and seismic waves of the input werenon-synchronous.The acceleration response of the slope and the input of seismic wave aresynchronicity,and the acceleration curve and the seismic wave process are basic and same,Butthe biggest quantity of amplitude are certain differences;in general,present a largestacceleration in the top of slope and a smallest acceleration in the toe of slope.The sameelevation slope is within the big table slope change rule.Under the action of earthquake,Thiscycle of seismic wave tensile and compressive deformation lead to slope cycle in geotechnicalengineering is the main reason for the damage.The slope and top happen to rip mainly damageboth shear failure,in the slope show front shear sliding failure.Slope gradient changes on the velocity,acceleration and displacement of the dynamic response of the parameters such asdistribution and change rule has certain control function; the same elevation, the greater theslope,the more obvious response to the dynamic.Slope of elevation has obvious amplificationeffect on dynamic response.Different slope shape of slope earthquake speed,acceleration anddisplacement process curve, the quantity in there are some differences,But the same basiccurve shape.Slope of slope body structure is to control the slope dynamic instability or areimportant factors of the resurrection.The seismic wave amplitude values and frequency andslope dynamic response has a direct relationship.(4)Do the dynamic stability analysis of stained that based on the slope rock mass and thedynamics of the sliding-cut instability mechanism of shear strength reduction and based onthe theory of pseudo static strength balance method of bedrock slope.Analyse the numericalresults of comparative,despite various stability some limitations,the slope deformation andfracture phenomena macro basic agreement with each other.