摘要
堆石料动力特性对土石坝抗震设计至关重要,但目前的研究大多基于单向循环的振动三轴试验,忽略径向振动对土体的影响,这与实际的地震作用有明显区别。文章通过室内试验研究双向振动下堆石料动模量和阻尼比的变化规律,揭示单、双向振动作用下堆石料动力特性差异。结果表明:单、双向振动下堆石料的动模量和阻尼比的变化规律一致,随围压增大,动模量增大,阻尼比减小,相同条件下,双向振动的动模量较单向振动更小,阻尼比略大。双向且先期振动对动模量影响较大,对阻尼比影响不显著。研究结果可以为土石坝填料设计提供参考。
The dynamic characteristics of rockfill materials are very important to the seismic design of earth-rock dams.However,most of the current research is based on uniaxial cyclic vibration triaxial tests,neglecting the impact of radialvibration on the soil.It is significantly different from actual seismic effects.The variation laws of dynamic modulus anddamping ratio of rockfill materials under bidirectional vibration were investigated through laboratory experiments.Thedifferences in dynamic characteristics of rockfill materials were revealed under uniaxial and bidirectional vibration.Theresults indicate that the variations of dynamic modulus and damping ratio on the rockfill material under single andbidirectional vibration are consistent.As the confining pressure increases,the dynamic modulus increases and thedamping ratio decreases.Under the same conditions,the dynamic modulus of bidirectional vibration is smaller and thedamping ratio is slightly larger.The initial vibration has a significant impact on the dynamic modulus,and a slight effecton the damping ratio.The research results can provide a reference for the design of earth rock dams filling materials.
作者
黄志雄
HUANG Zhixiong(Guangdong Gaofeng Construction Engineering Co.,Ltd,Huizhou Guangdong,516000,China)
出处
《江西水利科技》
2025年第2期96-102,共7页
Jiangxi Hydraulic Science & Technology
关键词
堆石料
动力特性
动模量
双向振动
Rockfill material
Dynamic characteristics
Dynamic modulus
Bidirectional vibration
