黄麻纤维加筋黄土动力特性研究

摘要/Abstract

摘要： 为探究黄麻纤维加筋黄土动力特性,将价格低廉且性能优良的天然黄麻纤维按照一定质量掺比加入到黄土中。利用动三轴设备,从动应力-应变关系、动弹性模量、阻尼比等指标分析不同黄麻纤维质量掺比下黄土的动力特性,并研究其加筋机理。结果表明:黄麻纤维加筋黄土的动应力随黄麻纤维质量掺比的增加,呈先增大后减小的趋势,且相同应变条件下,黄麻纤维质量掺比达到0.3%时,动应力达到最大;不同黄麻纤维质量掺比下的加筋黄土动弹性模量均大于素黄土,且动弹性模量随动应变的增加而下降;掺入一定质量的黄麻纤维可有效降低阻尼比,且不同围压(100 kPa、200 kPa、300 kPa)下最大阻尼比较最小阻尼比下降幅度均值分别为91%、120%、100%;SEM照片表示,过多纤维的掺入会使纤维互相纠缠,导致动力特性等指标下降。

关键词: 黄麻纤维, 黄土, 动三轴, 动应力-应变关系, 阻尼比, 动弹性模量

Abstract: In order to investigate the dynamic properties of jute fiber reinforced loess, the natural jute fiber with low price and good performance was added into the loess according to certain mass mixing ratio. The dynamic stress-strain relationship, dynamic modulus of elasticity, damping ratio and other indicators were tested to analyze the dynamic properties of loess with different mass ratios of jute fiber and to study the reinforcement mechanism. The test results show that the dynamic stress increases first and then decreases with the increase of jute fiber content. Under the same strain condition, the dynamic stress reaches the maximum when jute fiber mass ratio reaches 0.3%. The dynamic modulus of elasticity of loess with different jute fiber mass ratios is greater than that of normal loess and decreases with the increase of dynamic strain.The damping ratio effectively reduces by incorporating a certain mass of jute fiber, and the average values of maximum damping ratio decrease compared to minimum damping ratio at different surrounding pressures (100 kPa, 200 kPa, 300 kPa) are 91%, 120%, 100%, respectively. SEM images indicate that the incorporation of excessive fiber causes the fibers to be entangled with each other, resulting in the decrease of dynamic properties and other indicators.

Key words: jute fiber, loess, dynamic triaxial, dynamic stress-strain relationship, damping ratio, dynamic modulus of elasticity

中图分类号:

TU444

刘继鹏, 张哲. 黄麻纤维加筋黄土动力特性研究[J]. 硅酸盐通报, 2022, 41(5): 1663-1668.

LIU Jipeng, ZHANG Zhe. Dynamic Properties of Jute Fiber Reinforced Loess[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1663-1668.

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