三峡非溢流重力坝应力位移模型试验研究

针对三峡水利枢纽工程非溢流重力坝横断面上的应力和位移进行模型试验研究.使用DH3816静态应变测试系统和千分位移计分别测量模型的应变和位移,对测试值进行计算分析和图形绘制.结果表明坝体的上游面出现了显著的拉应力集中现象,最大值出现在坝踵处,同时在下游面出现了较大的竖直压应力,最大值出现在坝趾处,但应力值均小于坝体混凝土和地基的抗拉及抗压强度;坝体位移呈抛物线状,坝体处于弹性状态,大坝运行状态较为正常.

Experimental investigation of stress-displacement model of non-overflow gravity dam of Three-Gorge water power plant

Aimed at the non-overflow dam of key water conservancy project of Three-Gorge,the model of stress and displacement of the dam's cross-section was investigated experimentally.The strain and displacement of the model were tested with static strain measurement system DH3816 and microdistancer,respectively.The measured data was processed,analyzed,and plotted as characteristic curves.It was shown by the investigation result that,within the upstream side of the dam,there was remarkable phenomenon of tensile stress concentration with a maximum at the dam's foot.Meantime,a greater vertical compressive stress occurred within the downstream side of the dam with a maximum at the dam's toe.These maximums,however,were all lower than the tensile and compressive strength of the concrete of dam's body and foundation.The displacement path took the form of parabola,the dam body remained in the elastic condition,and the operational state of the dam was normal in general.