循环剪切作用下砾石–格栅界面颗粒破碎特性研究

doi:10.13722/j.cnki.jrme.2020.0793

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摘要为了研究循环剪切条件下砾石–格栅界面剪切破碎特性，分别在不同循环剪切位移幅值、竖向应力、剪切频率和循环次数等条件下进行筋土界面循环直剪试验。通过分析循环剪切前后颗粒级配变化，并采用相对破碎率量化颗粒破碎程度。试验结果表明：各剪切位移幅值下滞回圈峰值剪切应力随着循环次数增加逐渐增大，剪应力会受到颗粒破碎影响产生波动；颗粒破碎主要是由于循环剪切作用，剪切位移幅值的增大促进颗粒相对破碎率的增加，并且两者符合双曲线函数关系；竖向应力、剪切频率与相对破碎率之间的关系均可用对数函数描述，最大相对破碎率分别为13.54%和11.22%；循环次数对颗粒相对破碎率影响较大，循环次数越多，颗粒破碎率越大；在不同试验条件下，通过双曲线函数拟合颗粒相对破碎率与输入塑性功之间相互关系效果良好，两者呈非线性正相关关系。

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	应梦杰1
	王军2
	刘飞禹1

关键词 ：土力学, 循环直剪试验, 颗粒级配, 相对破碎率, 剪切位移幅值, 塑性功

Abstract：In order to analyze the particle breakage of gravel-geogrid interfaces under cyclic shearing，cyclic direct shear tests of gravel geogrid interfaces were performed under different cyclic shear displacement amplitudes，normal stresses，shear frequencies and cycle numbers. The particle distribution change before and after cyclic shearing was analyzed，and the particle breakage was quantified by the relative particle breakage ratio. The test results show that the peak shear stress of each hysteresis loop increases gradually as the number of cycles increases，and fluctuates due to particle breakage. The relative particle breakage ratio increases with increasing the amplitude of the cyclic shearing displacement，obeying a hyperbolic function relationship. A logarithmic function can be used to describe the relationships between the normal stress and the shear frequency with the relative breakage ratio. The maximum relative breakage ratios are 13.54% and 11.22% for different normal stresses and shear frequencies. The number of cycles has a significant influence on the relative particle breakage ratio，and the larger the cycle number，the larger the relative breakage ratio. Moreover，under different test conditions，the relative particle breakage ratio has a non-linear positive correlation with the input plastic work，and the relationship between them can be described by a hyperbolic function.

Key words： soil mechanics cyclic direct shear tests particle distribution relative particle breakage ratio shear displacement amplitude plastic work

引用本文:

应梦杰1，王军2，刘飞禹1. 循环剪切作用下砾石–格栅界面颗粒破碎特性研究[J]. 岩石力学与工程学报, 2021, 40(7): 1484-1490.
YING Mengjie1，WANG Jun2，LIU Feiyu1. Experimental study on particle breakage of gravel-geogrid interfaces under cyclic shear. , 2021, 40(7): 1484-1490.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0793 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I7/1484

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