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为研究地震作用对深厚覆盖层中坝基防渗墙的应力变形规律的影响并评价其抗震安全性,以黄金坪沥青混凝土心墙堆石坝为工程背景,在三维非线性静力分析的基础上,对坝基防渗墙进行了地震动力时程分析,动力计算中,坝体材料及覆盖层采用Hardin-Drnevich本构模型.计算结果表明,在地震过程中,防渗墙加速度和动位移反应均较小;横河向最大拉应力相比于静力工况增加了10.9%,防渗墙拉裂状况基本没有恶化;竖直向最大压应力为-33.62 MPa,增幅为0.9%;竖直向压应力最大值仅1.8%来自于地震波作用.综合看来,设计地震对防渗墙的应力变形状态影响不大.
In order to study the effect of seismic action on the stress and deformation of dam foundation impervious wall in deep overburden and evaluate its seismic safety, taking Huangjinping asphalt concrete core rockfill dam as the engineering background, based on the three-dimensional nonlinear static analysis , The dynamic time history analysis of the dam foundation impervious wall was carried out. In the dynamic calculation, the Hardin-Drnevich constitutive model was used for the dam material and the overburden. The calculation results show that during the earthquake, both the acceleration and the dynamic displacement of the cut-off wall The maximum tensile stress in Yokogawa increased by 10.9% compared with that in static condition, and the condition of impervious wall was basically no deterioration. The maximum vertical compressive stress was -33.62 MPa, an increase of 0.9% Only 1.8% of the maximum compressive stress comes from the seismic wave, which shows that the design earthquake has little effect on the stress-strain state of the cut-off wall.