Study On Deformation Regularity Of Landslide Under The Influence Of Reservoir Water

Landslide is one kind of geological disaster with great hazard, the main force of which along the shear surface and mechanism is that the shear force exceeds the stabilizing force on the slip band. The crust rock and soil will became catastrophic phenomenon, a multiple of geological disasters. Landslide in the widely distributed worldwide, it is not only a threat to human life and property, but also the destructive power of the environment.This paper, baijiabao Landslide as an example is located on the right bank of xiangxi river in the Three Gorges Reservoir Area.Groundwater evolution regularity, landslide deformation model and landslide deformation law are target study. learned to understand the landslide of rock and soil composition, structural features, geomorphology, hydrogeology, geological environment, and landslide monitoring data from November2006to November2010Monitoring data was converted, projected and splited based on the consistency of the GPS monitoring data time,and then rain and groundwater, reservoir water are acquired the induction factor in this experiment.Firstly, choose the right factor which has significant with target study. The relationship between the induction factor and the target study are discussed,and then the target study data are clustered by K-means algorithm with the generated clustering centers. Analyzing of the Characteristic of the target study in the time series.By using of information gain in information subject and Gini in signal detection theory, the quantities of the sources contribution were also calculated by target study and induction factor. Lastly study on evolution of groundwater, deformation model and deformation law under the reservoir water level fluctuations on the two monitoring points located main profiler of the baijiabao landslide. The mainly conclusions are as follows:1. Groundwater evolution regularity under the influence of reservoir WaterSKI groundwater located on trailing edge of landslide distributed in a very small-localized region,where rain exists a quite strong influence. Section of the rainfall, the daily maximum rainfall,lagging behind one week rainfall, these three parameters on the SKI groundwater is significantly and positively correlated positively with groundwater. SK2groundwater located on leading edge of landslide is mainly affected by the rate of monthly reservoir water accumulated liters,monthly rainfall, and fluctuation rate of the reservoir water, it is combined effects of rainfall and reservoir water from the impact of factors.2. Landslide deformation model under the influence of reservoir waterGenerally according to the dynamics type, baijiabao landslide is mixed type by study on GPS monitoring points-ZG324and ZG325on the main profile. Landslide deformation model’s induced factors are SK2falling water, the cumulative fluctuation rate of reservoir water, accumulated liters rate of reservoir water, rainfall, SKI falling water. The relative translucency of the five factors are as follows:SK2falling water (0.2444)> the cumulative fluctuation rate of reservoir water (0.2222)> accumulated liters rate of reservoir water(0.2)> rainfall(0.1778)> SKI falling water(0.1556). Groundwater and reservoir water are important affecting factor for deformation model, landslide main impulse is was based on the additional groundwater hydrodynamic pressures in the front edge of landslide.3. Landslide deformation law in the period of different water level runningStudy on baijiabao landslide deformation law between post-diversion period:20062008(145-156m), landslide deformation was affected by rain factors, correlated significantly with two months rainfall, it was showed that fitting accuracy reached0.399mm;when in the normal water period:2008-2010(145-175m), landslide deformation was affected by reservoir water moves, it was showed that fitting accuracy reached2.194mm. Landslide deformation will be accelerated with entering a new hydrological environment, especially the sharp dropping of reservoir water,but with the landslide self adjustment, landslide deformation decrease gradually, towards the relatively stable direction during the next time the same hydrological environment.