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《Journal of Geomechanics》 2017-02
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SIMULATION ANALYSIS OF THE INFLUENCE OF THE RESERVOIR WATER LEVEL FLUCTUATION RATE ON THE STABILITY OF SHUANGJIAPING ACCUMULATION LANDSLIDE IN YA'AN

LI Peng-yue;BA Ren-ji;NI Hua-yong;WANG Dong-hui;Chengdu Institute of Geology and Mineral Resources;  
The stability of reservoir bank slope after impounding has been a hotspot for research,the periodic fluctuation of the reservoir water level can change the seepage field of the slope and then affect its stress field which can induces the deformation of the rock-soil mass. The effect of the reservoir water level fluctuation is especially significant for the stability of the landslide. In this paper,Shuangjiaping landslide at the Pubugou Hydropower Station Reservoir Area is chosen as the research object. On the basis of investigation and analysis,according to the theory of unsaturated soil mechanics,taking the soil-water characteristic curve and permeability into consideration,the stability and seepage value of Shuangjiapingaccumulation landslide under steady-transient conditions were calculated under the action of reservoir. Using the Seep module of Geo Studio software to simulate the landslide groundwater fluctuation under the action of reservoir,the changes of the internal seepage field in accumulation landslide under different reservoir fluctuation conditions were calculated and the results are coupled to the stability calculationin the slopemodule. The study results show that,as the water level rising,the landslide stability rise at first then get lower,and the higher the rate of elevation,the greater the extent of the decrease of the landslide stability. In water level decline phase,the stability of the landslide shows the trend first reduce gradually recover,and the higher the water level decline rate,the lower the extent of the decrease of the landslide stability. The study results have an important significance for the geological disaster monitoring and early warning,disaster prevention and mitigation,regulation of the storage capacity of reservoirs.
【Fund】: 中国地质调查局地质调查项目(1212011220131 121201010000150015)
【CateGory Index】: P642.22
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