冻融循环下秸秆纤维改良土抗剪强度研究
RESEARCH ON THE SHEAR STRENGTH OF STRAW FIBER IMPROVED SOIL UNDER THE CONDITION OF FREEZE-THAW CYCLE
郑铭杰 1王锐 1敖彬 2刘宏庆 1李明博 1任俊洋1
作者信息
- 1. 东北林业大学土木与交通学院,哈尔滨 150040
- 2. 东北林业大学林学院,哈尔滨 150040
- 折叠
摘要
为研究冻融作用下水稻秸秆纤维改良土的抗剪强度特性,向素土中加入不同纤维长度、掺量的水稻秸秆纤维进行抗剪强度和抗冻融作用分析,结果表明当纤维配比为长度9 mm,掺量0.6%时,改良效果最显著;经历冻融作用后,黏聚力随冻融次数增加呈指数降低趋势,在前3次冻融作用下降低明显;冻融作用使加筋土内摩擦角降低,但内摩擦角随冻融循环次数增加变化不大.结论可为纤维改良土应用到实际工程中提供理论指导.
Abstract
This paper studies the shear strength of soil improved by rice straw fiber under freeze-thaw condition,in which the rice straw fiber with different fiber length and content was added into the plain soil to analyze the shear strength and freeze-thaw resistance.The results show that the improvement effectivenessis significant when the fiber ratio was 9 mm in length and 0.6%in content.After freezing-thawing cycles,the cohesionexponentially decreases with the increase of freezing-thawing cycles,and decreases significantly in the first three freezing-thawing cycles.The internal friction angle of reinforced soil decreases with the increase of freezing-thawing cycles,but the internal friction angle changes little with the increase of freezing-thawing cycles.The conclusions may provide theoretical guidance for the application of fiber improved soil in practicalengineering.
关键词
水稻秸秆纤维/抗剪强度/冻融循环/最佳参配比/黏聚力峰值Key words
rice straw fiber/shear strength/freeze-thaw cycle/optimal ratio/peak cohesion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据