摘要
利用WYS-2000大型动三轴试验机,采用分级加载逐级施加轴向动荷载,研究不同固结比和围压下砂砾料滞回曲线的形态特征的变化规律。试验结果表明:砂砾料属于黏弹性材料,不同初始加载位置所对应的砂砾料滞回曲线形态与土体的滞回曲线形态相似;相同动应力水平条件下,围压和固结比的增大,降低砂砾料的塑性应变,提高砂砾料的弹性性能;围压和固结比对砂砾料滞回曲线的面积影响较大,相同动应力作用下,滞回曲线面积随围压的增大而减小,随固结比的增大而减小,即围压和固结比的增大提高砂砾料刚度提高,材料吸收的动应变能减少。试验结果为砂砾料阻尼比及动力特性分析提供依据。
Using WYS-2000 large-scale dynamic triaxial testing machine and applying axial dynamic load step by step,the variation law of morphological characteristics of hysteretic curve of sand gravel under different consolidation ratio and confining pressure is studied.The test results show that the gravel material belongs to viscoelastic material,and the shape of hysteresis curve of gravel material corresponding to different initial loading positions is similar to that of soil;Under the same dynamic stress level,the increase of confining pressure and consolidation ratio reduces the plastic strain and improves the elastic properties of sand gravel;Confining pressure and consolidation ratio have a great influence on the area of hysteresis curve of gravel material.Under the same dynamic stress,the area of hysteresis curve decreases with the increase of confining pressure and consolidation ratio,that is,the stiffness of gravel material increases and the dynamic stress absorbed by material decreases with the increase of confining pressure and consolidation ratio.The test results provide a basis for the analysis of damping ratio and dynamic characteristics of gravel material.
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》
2022年第3期19-23,共5页
Jilin Water Resources
关键词
砂砾料
动三轴试验
滞回曲线
动应力
残余应变
sand gravel
dynamic triaxial test
hysteretic curve
dynamic stress
residual strain
