摘要
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.
Based on a improved power law rheology model,the stress and deformation analysis of a standardized 300mhigh-concrete face rockfill dam with different pre-settlement periods was investigated.Considering the engineering safety and economic demand,the long-term deformation of rockfill dam with different pre-settlement rates were compared and analyzed.A new deformation quantitative control characteristic is then proposed.It has some reference significance to the criterion of deformation quantitative control of 300mhigh-concrete face rockfill dam.The simulated results show that the rheology deformation has an important influence on the standardized 300mhigh-concrete face rockfill dam.In addition,without consideration of the canyon shape and dam slope,the long term deformation of rockfill dam,the deflection of concrete face slab together with the deformation of the peripheral joint will be significantly improved with the post-settlement rate of 4mm per month and the pre-setllement period of 6months.As for the standardized 300mhigh-concrete face rockfill dam,the deformation of the peripheral joint is too large.Reasonable engineering measures should be taken to decrease it.And the sealing structure could be improved to raise the security standard.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2016年第2期180-186,共7页
Engineering Journal of Wuhan University
基金
国家自然科学基金优秀青年科学基金资助(编号:51322905)
关键词
300m标准面板堆石坝
流变
预沉降速率
量化
特性
standardized 300mhigh-concrete face rockfill dam
rheology
pre-settlement rate
qualitification
characteristic
