三峡大坝及坝基施工期的特殊监控模型

针对三峡大坝施工期长、荷载变化复杂的特点，提出了施工期的特殊监控模型。编制了三维粘弹性有限元与无限元耦合分析程序。详细分析了泄洪坝段２＾＃坝块坝基开挖卸荷时基岩回弹变形的时间效应、坝体浇筑加载时基岩和坝体压缩变形的时间效应以及两者共同作用的时间效应，获得了施工期间坝基及大坝变形的全过程，从而解决了施工期间变形初始值的确定和全过程的力学模拟问题。

Special Monitoring Model for Three Gorges Dam and Bedrock in Construction Stage

In this paper, a special monitoring model is proposed for the Three Gorges Dam and the bedrock in the construction stage, and a 3 D viscoelastic finite infinite element coupled analysis program is developed. Then,the whole excavation process of the dam foundation and the pouring of the dam body in the 2nd dam block of the overflow section is simulated, and the time dependent deformation of the dam and the bedrock is studied in detail. The initial deformation of the dam and the bedrock is obtained. Therefore, the problems of the determination of the initial deformation and the mechanism simulation of the whole process in the construction stage are well solved.