Study On Resurrection Mechanism And Evolution Stability Of The Liang Shui Jing Landslides Under The Running Of The Three Gorges Reservoir

Liangshuijing Landslides of Three Gorges Reservoir as the basis, using limit equilibrium theory based on the transfer coefficient,FLAC numerical simulation and Monitoring work and so on, study on stability evolution and resurrection mechanism of landslides under the running of the Three Gorges Reservoir, the conclusions as follow:First, decline of water level changes in the mode of action of groundwater on the slide mainly uplift the body weight effect, penetration and the softening soak sliding soil , in which the water level rising stage uplift the role of weight loss and soaking to soften in the main,drawing phase is dominated by penetration.Second, based on the transfer coefficient method and numerical simulation of landslide stability analysis shows that when the water level rises above water level stage, the landslide body of groundwater with the water level roses gradually sliding the front section of landslide in the landslide slip surface saturated area and increase the length of Groundwater uplift of the sliding body weight loss and its effect on sliding soil softening effect of immersion increased, the overall landslide is reduced,thus resulting in reduced coefficient of slope stability and landslide evolution trend of stability was "down -type ",the stability factor of the high-water basic value to run fixed;Drawdown phase, with the penetration of the landslide body of groundwater is increasing,the overall decline force of the landslide also increases, slope stability factor remains on a downward trend, after the water level dropped to 145m on early stage of low water level, with the groundwater further infiltration, penetration of the scope of the role of the sliding body gradually decreases, when the level of landslide body water is equal to the normal groundwater leve, the groundwater penetration of the landslide disappears, slope stability factor reaches the maximum, that is, high water level drawdown to the running early phase, landslide evolution trend of stability is"down-rise type".Third, From April 2009 to April 2011, through the analysis of landslide monitoring results, landslide trend was the overall deformation, the level of water decline rate greater than the level of water rise rate,landslide deformation rate of the high water level greater than the low water level period. Most of the monitoring points'deformation rate close to average, the rate of landslide overall displacement was lower. The second hydrological year of landslide deformation rate lower than the first hydrological year's level, show that the creep deformation of the landslide in main, no signs of high-speed startup, and the overall deformation of a slowing trend.Fourth, result of changes in water level decline in slope stability, when the overall stability of the landslide break through the limit equilibrium, internal forces will slide out of balance, sliding force is greater than the anti-sliding force, and ultimately produced a large deformation of the resurrection. Calculated based on the results of slope stability and the monitoring results, the level of reservoir water changes in the influence of the lower rate of slope stability factor decreases, the overall displacement rate is smaller, combined with in front of the sliding section's features of the big sliding body, relatively flat sliding surface, integrated to determine the deformation of the landslide after the resurrection to creep-based, high-speed start the damage will not be the case, the theoretical calculation of evolution trend of stability and monitoring results was basically identical.Fifth, Through study on the resurrection mechanism of the landslide and the evolution trend of stability, combined with the current object of the landslide hazard is only the Yangtze River waterway, proposed to continue monitoring the landslide, landslides and further understand the deformation in the water under the influence of trends, if no obvious decline signs of increased deformation, may be temporarily on the implementation of engineering control measures for landslide; If landslides occur the increased deformation, may endanger the Yangtze River waterway, it is recommended to take project management of landslides, project management is recommended cutting side load shedding program.