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土石坝地震反应分析中,需要对有限网格的边界条件进行处理,以反应实际地基在空间上的无限性。分别采用黏性边界和刚性边界,对土石坝进行了动力分析。结果表明:随着坝高增加,黏性边界对坝顶加速度反应影响逐渐增大;对于均质坝,考虑黏性边界计算的坝顶加速度反应约比刚性边界低10%～30%;对于实际双江口直心墙土石坝,考虑黏性边界计算的坝顶加速度反应约比刚性边界低30%～40%左右。
In the seismic response analysis of earth-rock dam, the boundary conditions of finite grid need to be processed to reflect the infinite space of the actual foundation. The dynamic analysis of earth-rockfill dam is carried out by using viscous boundary and rigid boundary respectively. The results show that as the dam height increases, the influence of viscous boundary on the acceleration of dam crest gradually increases. For the homogeneous dam, the acceleration response of dam crest considering the viscous boundary is about 10% ~ 30% lower than the rigid boundary. For the actual In Shuangjiangkou straight-core earth-rockfill dam, the acceleration at the crest of the crest considering the viscous boundary is about 30% -40% lower than the rigid boundary.