摘要
为研究不同加载比对砂砾料动力特性的影响,利用大型动三轴试验机对NY水库筑坝砂砾料进行不同围压和加载比作用下动模量和阻尼比试验,并采用等效线性粘弹性模型分析动模量和阻尼比的变化规律。试验结果表明:等效线性模型对1/Ed与εd试验数据拟合较好,拟合度均大于0.90,不同加载比作用下砂砾料的动模量仍可用等效线性模型进行描述;围压和加载比对砂砾料动模量和阻尼比影响较大,围压相同时,随加载比的增大,砂砾料Edmax不断增大,最大阻尼比不断增大;加载比相同时,砂砾料Edmax随着围压的增大而增大;对比分析不同加载比作用下砂砾料动应力-动应变关系、动模量和阻尼比的变化,建议砂砾料动模量和阻尼比试验加载比应≥1.5。
In order to study the influence of different loading ratios on the dynamic characteristics of gravel materials,the dynamic modulus and damping ratio tests of NY reservoir dam gravel materials under different confining pressure and loading ratio are carried out by using a large-scale dynamic triaxial testing machine.The variation law of dynamic modulus and damping ratio are analyzed by using the equivalent linear viscoelastic model.The test results show that the equivalent linear model fits the 1/Ed and εd test data well,and the degree of fit is more than 0.90.The dynamic modulus of sand and gravel under different loading ratio can still be described by the equivalent linear model.The confining pressure and loading ratio have great influence on the dynamic modulus and damping ratio of sand and gravel.When the confining pressure is the same,the Edmax and the maximum damping ratio of sand and gravel increase with the increase of loading ratio.When the loading ratio is the same,the Edmax of sand and gravel increases with the increase of confining pressure.The changes of dynamic stress-strain relationship,dynamic modulus and damping ratio of sand and gravel under different loading ratios are compared and analyzed.it is suggested that the loading ratio of dynamic modulus and damping ratio of sand and gravel should be≥1.5.
作者
王景
Wang Jing(Xinjiang Water Conservancy and Hydropower Survey and Design Institute of MWR,Urumqi 830000,China)
出处
《吉林水利》
2021年第12期7-13,共7页
Jilin Water Resources
关键词
砂砾料
加载比
动模量
阻尼比
动应力-动应变
sand gravel
loading ratio dynamic modulus
damping ratio
dynamic stress-dynamic strain
