干湿循环作用下水泥改良泥质板岩粗粒土动力特性

发布时间：2018-06-04 02:32

本文选题：土动力学 + 粗粒土　；参考：《湖南大学学报(自然科学版)》2017年09期

【摘要】：为研究干湿循环作用对水泥改良泥质板岩粗粒土的动力稳定性影响,以标准养护龄期达28d的水泥改良泥质板岩粗粒土为试样,设计干湿循环条件下的改良土大型动三轴压缩试验.通过试验研究改良土动弹性模量、阻尼比和动应力强度等力学特征参数随干湿循环次数变化的规律,分析围压对干湿循环效应的影响,探讨干湿循环作用的影响机理.研究结果表明:1)随着干湿循环作用次数增加,最大动弹性模量和动强度均有所衰减,但衰减到一定程度后逐渐趋于稳定;2)最大阻尼比随着干湿循环作用次数增加而增加,但增加到一定程度后逐渐趋于稳定;3)干湿循环作用下,围压越大,最大动弹性模量和动强度的衰减幅度越小,最大阻尼比的增加幅度也越小.
[Abstract]:In order to study the effect of dry and wet cycling on the dynamic stability of cement-modified muddy slate coarse grained soil, the cement modified muddy slate coarse grained soil with a standard curing age of 28 days was taken as the sample. A large dynamic triaxial compression test of improved soil under dry and wet cycle was designed. The variation of dynamic elastic modulus, damping ratio and dynamic stress intensity of improved soil with the times of dry and wet cycles is studied. The influence of confining pressure on the effect of dry and wet circulation is analyzed, and the mechanism of the effect of dry and wet circulation is discussed. The results show that the maximum dynamic modulus of elasticity and dynamic strength decrease with the increase of dry-wet cycle times, but tend to stabilize gradually after decreasing to a certain extent) the maximum damping ratio increases with the increase of dry and wet cycles. However, the larger the confining pressure, the smaller the attenuation amplitude of the maximum dynamic modulus of elasticity and the dynamic strength, and the smaller the increase of the maximum damping ratio.
【作者单位】：中南大学土木工程学院;湖南理工学院土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51308210)~~
【分类号】：TU41

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