土坝和混凝土坝接头抗震性能的估计

本文依据实验中所观察到的现象．建议用四个指标估计混凝土坝和土坝接头的抗 震性能．第一．用混凝土坝和土坝心墙接触面的动静压力比估计防渗体的松脱程度； 第二，用有、无接头时土坝坝面初始开裂的振动历时之比及心墙最大地震应力比估计 接头对土坝地震反应的影响：第三，用土坝作用在混凝土坝上的地震荷载．估计土坝 对混凝土坝稳定性的影响。文中还建议了估计这些指标的方法。

Evaluation of Earthguake Resistent Characteristics of a Junction between Concrete Dam and Earth Dam

On the basis of the phenomena observed in the experiments, four indices of earthquake resistant characteristics of a junction between concrete dam and earth dam are proposed in this paper. The first is the ratio between the dynamic loads and static loads on the joint interface, which is to evaluate the increment of porosity ratio of the clay core of the earth dam near the junction. The second and the third indices are respectively the ratio between the vibration durations until the earth dam cracks with and witbout junction and the ratio betwecn the maximum dynamic stresses in the two cases, which are to eyaluate the effect of the concrete dam on earthquake response of the earth dam. The fourth index is the ratio between the dynamic load in the direction of the river on the whole interface and the weight of the concrete dam per unit width, which is to evaluate the effect of the earth dam on the stability of the concrete dam. Methods of evaluating these indices are recommended.