土石坝各向异性渗流特性及对坝坡稳定的影响

Analysis of Anisotropic Seepage and Stability of Earth Rock Dam

基于饱和-非饱和理论,以均质土石坝为例,采用固定网格法,运用ABAQUS有限元软件分析了渗透特性各向异性情况下的浸润线、流速分布,将流场作为初始应力导入到坝坡的稳定性计算中,基本解决了坝坡渗流与稳定性分析耦合问题。计算结果表明,坝坡浸润线、下游溢出点随着各向异性的增大而抬升;坝坡安全系数随着各向异性程度的增大而减小,论证了考虑各向异性渗流特性的必要性。

Based on saturated -unsaturated theory , using the fixed mesh finite element method , the saturation line and the velocity distribution of a homogeneous earth dam are studied , by the finite ele-ment software ABAQUS.The problem of coupling seepage with stability of dam is solved basically , by calculated the flow field as the initial condition.The results shows that the saturation line is in-creasing with the increasing of permeability anisotropy coefficient , so do the downstream overflow point.The safety coefficient of dam decreases with the increase of the permeability anisotropy coeffi-cient.It is necessary to consideration of the permeability anisotropy in seepage analysis.