某水电站大型倾倒体变形破坏特征及稳定性分析  

Analysis on deformation characteristics and stability of large dumping body at a hydropower station

作　　者：李刚[1] 赵其华[1] 陈强[1] 聂德新[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《人民长江》2014年第5期53-56,共4页Yangtze River

基　　金：地质灾害防治与地质环境保护国家重点实验室基金项目(SKLGP2010Z003)

摘　　要：针对黄河上游某水电站4号大型倾倒体发育的地质环境条件及工程地质特性,在现场调查资料的基础上,结合倾倒体斜坡表部变形破坏特征、岩层倾角和岩体波速变化等因素,确定了倾倒体的变形展布范围、变形破坏特征、岩体结构及坡体结构等。由室内直剪试验、岩体纵波速度与岩体质量以及岩体力学参数之间的相关性分别获得缓倾软弱结构面和倾倒体岩体的力学参数,并运用刚性极限平衡法对倾倒体的稳定性进行了评价。结果表明:该倾倒体在正常蓄水+地震工况下,斜坡稳定性较其他工况低,可能出现失稳破坏。其他工况下,倾倒体整体处于稳定状态,但是局部地方稳定性较差,处于欠稳定状态,可能产生小规模、小范围的下滑垮塌破坏。In the light of geological environment condition and engineering geological characteristics for development of No. 4 large dumping body at a hydropower station in the upstream of Yellow River and based on on-site investigation data, the deform-ation scope, deformation and failure characteristics, rock mass and slope body structures are determined by considering the fac-tors of the surface failure characteristics, the dip angle and the wave velocity of rock mass of the dumping body. The gentle-dipped weak structure plane and rock mechanics parameters of the dumping body are obtained by indoor direct shear test and the relation of longitudinal rock-mass velocity and rock-mass quality as well as rock mechanics parameters and the stability of the dumping body is evaluated by rigid body limit equilibrium method. The evaluation results show that the slope stability of the dumping body under the condition of normal impoundment and earthquake is lower than that of other conditions and stability fail-ure may occur;for other conditions, the dumping body is stable as a whole, but is poor in local area, and small scale landslide in a local scope may occur.

关 键 词：倾倒体 变形破坏 力学参数 稳定性分析 

分 类 号：TU459.2[建筑科学—岩土工程]