【摘要】 应用三维完全非线性动力弹塑性分析方法,研究了狭窄河谷中高土石坝的动力反应特性,通过计算分析,给出了不同河谷形状特性下高土石坝的剪应变和永久位移分布规律。结果表明:狭窄河谷地形导致大坝动力反应表现出较强的空间三维效应,河谷形状对坝体的剪应变和位移有显著影响;对称河谷时坝体的剪应变呈椭圆形往外延伸,最大值出现在坝顶心墙处;当河谷宽高比相对较小时,河谷形状对坝体的约束作用较强,位移增大的趋势相对较为明显;在同样河谷形状特性的情况下,宽河谷情况下的位移较缓岸坡情况下坝顶沉降要大些。本文结论可为狭窄地形强震地区的大坝设计提供依据。更多还原

【Abstract】 Three-dimensional nonlinear dynamic elasto-plastic analysis method is employed to study the seismic response characteristics of a high earth-rockfill dam in a narrow valley.The distribution rules of shear strain and permanent displacement are given with different topographies of valley.The results show that the dynamic response of the dam exhibits strong spatial three-dimensional effect of valley topography and that the shear strain and displacement of the dam has significant effects.For the symmetrical valley,the distribution of shear strain is extending out in an oval shape,and the maximum value appears at the crest of the core wall.When the shape factor of the ratio(L/H) is smaller,the constraint to the dam is stronger,and the displacement increases more obviously.Under the same ratio,the settlement of dam crest under a wider valley is larger than that under a gentler slope.The results are valuable for the design of high earth-rockfill dams with a narrow valley in meizoseismal areas.更多还原