摘要
为研究棕榈纤维掺加后对粉质黏土力学性能的影响,共设计5种纤维掺量和4种纤维长度,通过三轴固结不排水试验和扫描电子显微镜观察,研究加筋土力学性能变化规律和加筋机理。研究结果表明,加筋土与素土均呈现出中间大、两端小的鼓胀破坏状态,但由于纤维的掺加,使加筋土鼓胀并不明显,表明掺加纤维可有效改善土体抗变形能力;掺加棕榈纤维后,土体应力-应变曲线为较弱的应力强化型曲线;随着棕榈纤维掺量和长度的增加,加筋土偏应力峰值和黏聚力变化规律相似,基本呈现出先增大后减小的趋势,且均大于素土;棕榈纤维掺量和长度对加筋土内摩擦角的影响较小。
In order to study the effect of palm fiber on the shear strength of silty clay,a total of 5 fiber contents and 4 fiber lengths were designed,and the performance changes and reinforcement mechanism of reinforced soil were studied through triaxial consolidation undrained test and SEM test.The research results show that both the reinforced soil and the plain soil show a bulging failure state that is large in the middle and small at both ends.However,due to the addition of palm fibers,the bulging of the reinforced soil is not obvious,indicating that the addition of fibers can effectively improve the deformation resistance of the soil.After adding palm fiber,the soil stress-strain curve is a weaker stress-enhanced curve.With the increase of palm fiber content and length,the peak value of deviatoric stress and cohesion of reinforced soil are similar,showing a trend of palm first increasing and then decreasing,and both are larger than those of plain soil.The effect of palm fiber content and length on the internal friction angle of reinforced soil is small.
作者
吴靖江
潘世起
陈小羊
张鹏
沈笑秋
郑元勋
WU Jingjiang;PAN Shiqi;CHEN Xiaoyang;ZHANG Peng;SHEN Xiaoqiu;ZHENG Yuanxun(China Construction Seventh Engineering Division Co.,Ltd.,Zhengzhou,Henan 450004,China;School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China)
出处
《施工技术（中英文）》
CAS
2022年第9期142-148,共7页
Construction Technology
基金
国家自然科学基金面上项目(51878623)
中建七局科技研发课题(JTZB-TJDT-D005/2021)。
关键词
棕榈纤维
粉质黏土
加筋土
力学性能
试验研究
palm fiber
silty clay
reinforced soil
mechanical properties
experimental study
