残积土含水率对其动力特性影响试验研究
Test Study of the Influence of Moisture Content on Dynamic Characteristics of Residual Soil

选取厦门某建筑工程地基浅层残积土重塑试样,利用SDT-10微机控制电液伺服动态三轴测试系统,在呈正弦变化的动态荷载作用下,测试含水率分别为10%、15%、20%和23%时残积土试样的动应力-应变、动变形-作用时间(作用次数)、动弹性模量等动力学特性曲线与参数。分析试验数据表明:试样在动荷载作用下表现为黏弹塑性变形特性,且随着含水率提高,试样累积塑性轴向变形逐步增大,最大弹性模量逐步减少,但含水率由20%增至23%时,最大动弹性模量降低幅度不大。
In this study, we chose the shallow residual soil from a constructional engineering site in Xiamen as our remolded specimen, and used the SDT-10 microcomputer control electro-hydraulic servo dynamic triaxial test system as the main test equipment. Under sine dynamic loading, we tested the dynamic characteristic curves and parameters of the residual soil's dynamic stress-strain, dynamic deformation times (number of loads), and dynamic modulus of elasticity with moisture contents of 10%, 15%, 20%, and 23%. The analysis of the test data indicates that the specimens showed viscoelastic-plastic behavior, and the higher the moisture content of the specimen, the greater the cumulative plastic axis deformation, but the most elastic modulus slowly decreases. The extent of the decrease in the most elastic modulus is not great when the moisture content of specimen increases from 20% to 23%.