吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (6): 1612-1623.doi: 10.13229/j.cnki.jdxbgxb.20220930
• 交通运输工程·土木工程 • 上一篇
李丽华1,2(),李孜健1,2,肖衡林1,2(),曹文哲1,2,周鑫隆1,2,黄少平1,2
Li-hua LI1,2(),Zi-jian LI1,2,Heng-lin XIAO1,2(),Wen-zhe CAO1,2,Xin-long ZHOU1,2,Shao-ping HUANG1,2
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%。
中图分类号:
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