列车荷载作用下压实花岗岩残积土累积变形特性试验研究

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摘要为研究列车荷载作用下应力及湿化条件对压实花岗岩残积土累积变形特性的影响，以围压、动应力幅值、含水率为变量，对压实花岗岩残积土进行循环空心扭剪和循环定向加载试验。结果表明：循环扭剪应力路径下主应力轴旋转效应增加了试样的累积变形量，甚至改变了累积变形的发展模式，该影响程度随试样含水率的增大而增大；试样的累积应变发展速率在加载初期（N＜100）时完成大幅度衰减，围压增大可加快累积应变发展速率的衰减，动应力幅值的增加会延长累积应变发展速率的衰减时间，循环扭剪加载时试样的累积应变发展速率衰减程度小于循环定向加载试验，含水率越高该效应越显著。通过预测模型能够对两种动力加载应力路径下的稳定型和发展型累积应变发展曲线能够进行拟合，对压实花岗岩残积土的累积变形作出较好预测。

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	尹松1
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	刘鹏飞2
	孙玉周2
	李新明2
	闫盼2
	王志留2

关键词 ：花岗岩残积土, 循环加载, 空心扭剪, 应力路径, 主应力轴旋转, 累积变形预测

Abstract：In order to study the influence of stress and humidification conditions on the cumulative deformation characteristics of compacted granite residual soil under train load, cyclic hollow torsional shear and cyclic directional loading tests were carried out on compacted granite residual soil with confining pressure, dynamic stress amplitude and water content as variables. The results show that the rotation effect of principal stress axis under cyclic torsional shear stress path increases the cumulative deformation and even changes the development mode of the cumulative deformation, and the effect degree increases with the increase of the water content of the sample. Sample rate of accumulated strain development at the beginning of the load (N < 100) complete greatly attenuation, the increase of confining pressure can accelerate the development of accumulated strain velocity attenuation, the increase of the dynamic stress amplitude will extend the accumulated strain development rate decay time, cumulative strain development of cyclic torsional shear loading when the sample rate attenuation degree directional load is less than the cyclic triaxial test, The higher the moisture content, the more significant the effect. The prediction model can fit the development curves of stable and developed cumulative.

Key words： Granite residual soil cyclic loading dynamic hollow cylinder test stress path principal stress axis rotation cumulative deformation prediction

收稿日期: 2022-11-14 出版日期: 2024-02-28

引用本文:

尹松1,2，刘鹏飞2，孙玉周2，李新明2，闫盼2，王志留2. 列车荷载作用下压实花岗岩残积土累积变形特性试验研究[J]. 振动与冲击, 2024, 43(4): 87-95.
YIN Song1,2，LIU Pengfei2，SUN Yuzhou2，LI Xinming2，YAN Pan2，WANG Zhiliu2. Research on cumulative plastic strain characteristics of granite residual soil under cyclic loading. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(4): 87-95.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I4/87

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