土料流变影响下樟树水库围堰应力变形问题探讨

Effect of Soil Rheology on Stress and Deformation of Zhangshu Reservoir Cofferdam

以位于江西省九江市德安县磨溪乡的樟树水库为例,在概述水库围堰基本情况及围堰应力变形受土料流变影响可能性的基础上,采用能充分反映堆体流变遗传特性的增量流变模型进行该水库围堰分层填筑施工过程中堰体及防渗墙应力变形过程的有限元分析。结果表明,土料分层填筑对该水库围堰和防渗墙应力变形存在一定程度的不利影响,防渗墙接头部也表现出不断增大的位移及局部剪切破坏,但这种影响完全在可接受范围内,无需采取应对措施。

Taking the Zhangshu Reservoir located in Moxi Township,Dean County,Jiujiang City,Jiangxi province as an example,the basic situation of the reservoir cofferdam and the possibility of the stress and deformation of the cofferdam being affected by the rheology of soil materials are summarized,the incremental rheological model,which can fully reflect the rheological genetic characteristics of the stack material,was used to carry out the finite element analysis of the stress and deformation process of the cofferdam and the cutoff wallsl in the course of layered filling construction of the reservoir.The results show that the layered filling of soil materials has a certain degree of adverse influence on the stress and deformation of the cofferdam and the cutoff wall of the reservoir,and the joints of the cut-off wall also show increasing displacement and local shear failure,but the impact is completely acceptable and no countermeasures were required.