雷家河水库围堰应力变形受土石料流变影响问题探讨

Discussion on stress and deformation of cofferdam of Leijiahe Reservoir affected by rheology of earth and rock

以雷家河水库工程为例,分析了其高土石围堰堰体在巨大水头影响下堰体内土石料流变对防渗结构变形及应力产生较大不利影响的可能,并在模拟堰体分层填筑施工等过程的基础上,应用能体现土体流变遗传性状的增量模型进行了该水电站围堰应力应变受土石料流变影响的有限元分析。结果表明,该水库围堰堰体防渗墙应力变形受土石料流变不利影响较为明显,且防渗墙接头处位移表现出不断增大的趋势,且局部已经发生剪切破坏,为此,必须采取有效措施应对处理。

Taking the Leijiahe reservior project as an example,this paper analyzed the possibility of adverse effects of rheology of earth and rock material in the cofferdam on the stress and deformation of impervious structure under the influence of huge water head.On the basis of simulated process of layered filling construction of the cofferdam,the finite element analysis of the stress and strain of the cofferdam affected by rheology of earth and rock was carried out by using the incremental model which can reflect the rheological genetic properties of soil.The results show that the stress and deformation of impervious wall of the reservoir cofferdam was obviously affected by the rheology of earth and rock,and the displacement at the joint of the impervious wall is increasing,and local shear failure has occurred.Therefore,effective measures must be taken to deal with it.