土工格栅加筋建筑垃圾土循环剪切试验

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中文摘要：为研究不同大小法向应力及剪切幅值条件下双向土工格栅加筋建筑垃圾土剪切特性，采用大型直剪仪对该加筋土开展单调直剪试验和循环剪切试验，揭示加筋建筑垃圾土循环剪切特性影响规律及工作机制。结果表明:建筑垃圾土在单调直剪试验和循环后直剪试验中均出现明显剪切软化现象，但同等法向应力条件下循环剪切后试样的界面抗剪增和残余强度均更高;在单调直剪试验中，剪切初期试样小幅度剪胀，随后明显剪缩，当剪切位移超过20 mm后试样剪缩速度变缓;在循环后单调直剪试验中，试样则表现出明显剪胀，且在相同剪切位移下会产生更大的体变;在循环剪切过程中，试样发生明显剪切硬化，且在循环剪切卸载方向上剪切硬化现象更为明显，阻尼比随界面刚度的增大而不断减小，在同一剪切幅值条件下，随着循环次数的增加，不同法向应力下界面阻尼比逐渐减小并趋于同一数值;不同方向上最大剪应力均随法向应力和剪切幅值的增大而增大，且随着循环次数的增加，剪切硬化程度也逐渐提高;循环后加筋建筑垃圾土试样抗剪强度明显提高，黏聚力和摩擦角增幅分别为22。4%和9。6%。

外文标题：Experiment on cyclic shear of geosynthetic reinforced construction waste soil

外文摘要：In order to study the shear behavior of geosynthetic-soil interface reinforcement of biaxial geogrid reinforced construction waste under different sizes normal stress and shear amplitude,Monotonic direct shear test and cyclic shear test of the reinforced soil were carried out by large direct shear apparatus,thus,the influence law and mechanism of normal stress and shear amplitude on shear characteristics of reinforcement-soil interface were revealed.Results show that obvious shear softening occurs in both monotonic and post cyclic direct shear tests,however,the interfacial shear strength and residual strength of the specimens are greater after cyclic shear under the same normal stress conditions.In monotonic direct shear test,the sample exhibits a small expansion at the initial stage of shearing,followed by significant shrinkage,the shear shrinkage rate slows down when the shear displacement exceeds 20 mm.In the post cyclic monotonic direct shear test,the specimen shows obvious dilatancy and produces larger volumetric strain under the same shear displacement.During the cyclic shearing process,the sample undergoes obvious shear hardening,and the shear hardening phenomenon is more obvious in the cyclic shear unloading direction,damping ratio decreases with the increase of interface stiffness,under the same shear amplitude,the damping ratio decreases with the increase of cyclic number and tends to the same value under different normal stresses.The maximum shear stress in different directions increases with the increase of normal stress and shear amplitude,with the increase of cycle times,the degree of shear hardening also increases gradually.The shear strength of reinforced construction waste soil increased significantly after cyclic loading,and the increase of cohesion and internal friction angle is 22.4%and 9.6%respectively.

外文关键词：

geotechnical engineeringreinforced construction waste soilbiaxial geogridcyclic shear testmonotonic direct shear test

作者：

李丽华、李孜健、肖衡林、曹文哲、周鑫隆、黄少平

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作者单位：

湖北工业大学土木建筑与环境学院,武汉 430068

湖北工业大学河湖健康智慧感知与生态修复教育部重点实验室,武汉 430068

关键词：

岩土工程加筋建筑垃圾土双向土工格栅循环剪切试验单调直剪试验

基金：

国家自然科学基金项目国家自然科学基金项目湖北省自然科学基金创新群体项目湖北省重点研发计划项目湖北工业大学杰出人才基金项目

项目编号：

52278347U22A202322024AFA0092022BCA059XJ2021000501

出版年：

2024

DOI：

10.13229/j.cnki.jdxbgxb.20220930

吉林大学学报(工学版)

吉林大学

吉林大学学报(工学版)

CSTPCD北大核心

影响因子：0.792

ISSN：1671-5497

年,卷(期)：2024.54(6)

参考文献量11