地震波斜入射下重力坝的动响应分析

Dynamic Response Analysis of Gravity Dam under Oblique Incidence of Seismic Wave

为研究地震波斜入射对重力坝动力响应的影响,利用FLAC3D,基于某碾压混凝土重力坝,研究了不同角度仅SV波、仅P波以及SV波和P波同时斜入射下的坝体动力响应。重点分析了坝体顺河向位移、竖直向位移、主应力及抗滑稳定。结果表明,SV波和P波同时斜入射时,坝体的各项动响应随着入射角度增加均朝不利方向发展,顺河向及竖直向位移增幅最大达28.1%、53.4%,第一和第三主应力增幅分别达14.0%和11.2%,说明动力分析时考虑地震波同时斜入射是必要的。

In order to study the influence of oblique incidence of seismic wave on the dynamic response of gravity dam,the FLAC3D is used to study the dynamic response of a RCC gravity dam under the separate oblique incidence of SV wave,the single oblique incidence of P wave and the simultaneous oblique incidence of SV wave and P wave.The displacement along the river,the vertical displacement,the principal stress and the anti-slip stability of the dam body are analyzed emphatically.The results show that,when the SV wave and P wave are incident obliquely at the same time,the various dynamic responses of the dam develop in unfavorable directions as the incident angle increases,the maximum increase in displacement along the river and in the vertical direction is 28.1%and 53.4%respectively,and the increase of the first principal stress and the third principal stress reach 14.0%and 11.2%respectively,indicating that it is necessary to consider the simultaneous oblique incidence of seismic waves in dynamic analysis.