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东圳水库大坝位于福建省莆田市城厢区,该水利枢纽处于华南沿海地震带北段,由于水库建设时我国尚未有抗震设防烈度标准,因此亟需对其抗震稳定性进行复核。以东圳水库大坝为原型,结合已有的地震资料,选用Byrne液化模型,采用FLAC3D软件,研究了在50年超越概率10%、5%和2%地震作用下坝体填料的液化特征及最终位移情况。结果显示,在地震作用下,坝体上游砂砾石填料会发生局部液化,且液化区随着地震强度的增大而增加,但尚未出现大面积连续液化区;坝体填料发生液化后,产生了有限度的塑性变形,其变形量也随着地震强度的增大而有所增加;除坝顶较小区域外,坝体总位移量相对较小,对大坝整体稳定性不会产生显著影响。研究结论可以为大坝的抗震加固和治理措施的选择提供依据和参考。
Dongzhen Reservoir Dam is located in Chengxiang District, Putian City, Fujian Province. The water control project is located in the northern section of South China Coastal Seismic Belt. Since there is no seismic intensity standard in our country, it is urgent to check its seismic stability. Taking Dongzhen reservoir dam as a prototype and combining with existing seismic data, the Byrne liquefaction model was selected and the liquefaction characteristics of dam packing under 10%, 5% and 2% probability of surpassing 50% for 50 years by using FLAC3D software. The final displacement situation. The results show that the sand and gravel packing in the upper reaches of the dam will be locally liquefied under the action of earthquake and the liquefaction zone will increase with the increase of earthquake intensity but a large area of continuous liquefaction zone has not yet appeared. After the liquefaction of the dam packing occurs, With limited plastic deformation, the deformation amount also increases with the increase of earthquake intensity. The total displacement of the dam body is relatively small except for the small crest area, which has no significant effect on the dam overall stability . The conclusions of the study can provide the basis and references for the selection of dam anti-seismic reinforcement and control measures.