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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。
Based on the theory of cumulative damage induced by Longgang’s soil under irregular load, a permanent deformation analysis method for earth-rock dam based on cumulative damage theory is proposed. The static and dynamic deformation characteristics of an earth-rock dam dam are tested by using large-scale static and dynamic triaxial apparatus. The static and dynamic stress-strain relationship, cumulative strain model and corresponding material parameters are determined. Using this method, the permanent deformation characteristics of the earth-rock dam under construction of the dam and its completion after the M7.2 Iwate-Miyagi M7.2 earthquake in Japan on June 14, 2008 were studied respectively. The results show that the calculated settlement value of dam body in dam body basically agrees with the measured value in the field and the predicted value of dam settlement after completion is within a reasonable range by comparison with other measured values.