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为了解模型坝地震残余变形的分布规律和破坏形态,进行了不同地震波输入的振动台试验。坝体的沉陷和水平变位总体量值很小,地震残余变形主要发生于下游坡河谷坝段附近;坝顶有少量沉降变形和下游坝坡浅层滑动,而上游坡未观察到明显的水平变位或沉陷;下游坝坡的颗粒松动,发生滚石或浅层滑动,并首先发生于坝顶河谷坝段附近,且随着地震动的加大,范围逐渐扩大,但没有发现深层滑动的迹象;坝体自振频率降低越多,说明振动对坝体造成的损伤越严重;双向或多向地震动输入不利于坝坡的稳定。
In order to understand the distribution law and the failure mode of the residual deformation in the model dam, shaking table tests with different seismic waves were carried out. The overall magnitude of the subsidence and horizontal displacement of the dam body is very small. The residual deformation of the earthquakes mainly occurs in the vicinity of the dam section of the downstream slope; there is a small amount of settlement deformation in the crest and shallow sliding of the downstream dam slope, but no obvious level is observed in the upstream slope Displacement or subsidence. The particles in the downstream slope are loosened, and the rockfall or shallow sliding occurs, and occurs first in the vicinity of the dam crevasse. With the increase of ground motions, the range gradually expands but no sign of deep sliding is found . The more the natural frequency of the dam is reduced, the more serious the damage caused by vibration to the dam. The input of bidirectional or multi-directional ground motion is not conducive to the stability of the dam.