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Numerical simulation of high slopes deformation characteristics at intake during reservoir water-storing operation of a reservoir of Minjiang River,China

CAO Yun-jiang;YANG Hao;HUANG Run-qiu;FENG Tao;TANG Hui-ming;HUANG Yu-feng;Hunan University of Science and Technology,Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection;School of Civil Engineering of Hunan University of Science and Technology;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology;Faculty of Engineering of China University of Geosciences;  
The previous geological investigation of some hydroelectric power station shows that the groundwater type in the junction region is mainly the Quaternary overburden pore phreatic water and bedrock fracture water.The water-level elevated 127 mafter reservoir water-storing,exerting agreat influence on the groundwater seepage field on the bilateral slopes of the strip ridge.This not only changed the pre-existent seepage field characteristics and the recharge,runoff,and drainage conditions of the slope groundwater,but also generated interstitial hydraulic pressure,making an impact on the slope stability.By using the geological-prototype and geological-mechanical model(GMD model)of the excavation slope,the seepage model of the strip ridge groundwater and the water-rock action mode are established during the reservoir water-storing.The seepage field change of the water-storing is further considered.Utilizing the numerical simulation,the high slope stability during different water-storing levels is studied.The deformation field characteristics as well as the stability situation of the high slope of the strip ridge are discussed in the water-storing process.3D artificial simulation shows that the reservoir spillway water inlet,the L11 horizon of EL.885 m platform(EL.840~852m),and the slope to the left of 2#tunnel are large deformation concentrated areas.The range of the rock mass deformation will be gradually enlarged along with the water-storing level elevating during the reservoir water level rises at the reservoir water inlet side slope.The displacement will be gradually increased.That the river displacement(Y direction)on the reservoir water intake slope is the bedding slip inside or the toppling failure outside is uncertain affected by the storage level.The interlayer shear rupture zone becomes the "transform fault"effect of the positive and negative displacements.
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