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采用高围压下的幂函数流变模型对不同预沉降周期下的300m标准面板坝进行应力、变形分析,在考虑经济性和安全性的要求下,对比和分析不同预沉降速率下的堆石体后期变形、面板应力变形和周边缝变形,提出可操作的变形量化控制的新特性,对300m级高混凝土面板堆石坝变形量化控制指标的确定具有一定的参考意义.结果表明,流变变形对300m标准面板坝具有重要影响,在不考虑河谷形状和坝坡因素的影响下,堆石体预沉降速率为4mm/月,预沉降周期为6个月,可显著减小堆石体后期变形,且明显改善面板应力变形性态和周边缝的变形;对于300m标准面板坝,周边缝的剪切、沉陷和张开值偏大,需采取合理的工程措施减小周边缝变形,或改进止水结构,提高其安全标准.
The power function rheological model under high confining pressure was used to analyze the stress and deformation of 300m standard face slab under different pre-settling periods. Under the requirements of economy and safety, the rockfill under different pre-sedimentation rates was compared and analyzed. The late deformation of body, the deformation of the panel and the deformation of the perimeter of the joint, a new feature of operational deformation control is put forward, which is of certain reference significance for determining the quantitative control index of 300m concrete faced rockfill dam. The results show that the rheological deformation It has an important influence on the 300m standard face dam. The pre-settlement rate of the rockfill body is 4mm / month and the pre-settling period is 6 months under the influence of the shape of the valley and the slope of the slope, which can significantly reduce the post-deformation of the rockfill body , And obviously improve the stress-strain behavior of the panel and the deformation of the perimeter seam. For the 300m standard face-plate dam, the shear, subsidence and openness of the perimeter seam are too large. Therefore, reasonable engineering measures should be taken to reduce the deformation of the perimeter seam or improve Water structure to improve its safety standards.