基于累积损伤理论的土石坝地震永久变形分析

以龙冈的在不规则荷载作用下土体应变的累积损伤理论为基础，提出了基于累积损伤理论的土石坝地震永久变形分析方法。采用大型静力和动力三轴仪，对某土石坝筑坝材料的静动变形特性进行了试验研究，确定了筑坝材料的静力和动力应力应变关系、累积应变模型和相应的材料参数。利用该方法，分别对在日本2008年6月14日岩手?宫城内陆M7.2级地震作用下该土石坝的在建坝体和竣工后坝体的地震永久变形特性进行了研究。结果表明：在建坝体的坝内沉降计算值与现场实测值基本吻合，并且通过与其它土石坝实测值的比较，说明竣工后坝体的坝顶沉降预测值在合理范围之内。

Earthquake-induced permanent deformation of rockfill dams based on cumulative damage theory

Based on the Tatsuoka's cumulative damage theory of soil strains under irregular loadings, a numerical analysis method for the earthquake-induced permanent deformation of rockfill dams is proposed. The mechanical experiments of the rockfill materials are carried out by use of the large static and dynamic triaxial apparatus, and the material parameters related to the stress-strain relationship and cumulative strain model are determined. By use of the proposed method, the earthquake-induced permanent deformation characteristics of the rockfill dam under construction and after completion are studied respectively for the Iwate-Miyagi Nairiku earthquake of M7.2 on 14 June 2008 in Japan. The results show that the earthquake-induced settlement computed by the proposed method is basically consistent with the measured one under the construction of the dam. Moreover, the predicted value of the earthquake-induced settlement at the crest after the completion of the dam is within the reasonable range by comparison of the measured data of the other similar dams.