不同含水率下花岗岩残积土循环剪切特性研究

doi:10.13722/j.cnki.jrme.2022.0121

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摘要为了研究花岗岩残积土在动荷载作用下的剪切特性，分别在不同的含水率(13%，17%，21%和25%)、竖向应力(50，75和100 kPa)、剪切幅值(1，3，6和9 mm)和剪切频率(0.1，0.5，1和2 Hz)下进行一系列水平循环剪切试验，研究花岗岩残积土在循环剪切过程中剪应力、竖向位移的变化规律，并通过扫描电子显微镜对残积土体微观结构的变化进行分析，揭示不同含水率土体的剪切破坏机制。试验结果表明：循环剪切过程中残积土峰值剪切强度和残余剪切强度均随含水率的升高先增大后减小；含水率越高、竖向应力越大，土体最终竖向位移越大，体积剪缩现象越明显；当剪切幅值不小于3 mm时，土体发生循环剪切软化现象，且幅值越大，软化程度越高；当含水率为13%，17%和21%时，土体平均峰值剪应力随剪切频率的增加先增大后减小，当含水率为25%时，土体平均峰值剪应力随剪切频率的增加而增大。

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	刘飞禹1
	梁崇旭1
	王军2
	刘洪波3

关键词 ：岩石力学, 花岗岩残积土, 含水率, 剪切幅值, 剪切频率, 循环剪切

Abstract：To study the shear characteristics of residual soil derived from granite under dynamic loading，a series of horizontal cyclic shear tests were conducted under different moisture contents(13%，17%，21% and 25%)，vertical stresses(50，75 and 100 kPa)，shear amplitudes(1，3，6 and 9 mm)，and shear frequencies(0.1，0.5，1 and 2 Hz). The variations of shear stress and vertical displacement of the residual soil during the cyclic shear process were investigated，and the changes in the microstructure of the residual soil were analyzed using scanning electron microscopy to reveal the shear failure mechanisms of soils with different moisture contents. The experimental results showed that the peak shear strength and residual shear strength of the residual soil increased first and then decreased with increasing moisture content during the cyclic shear process. Higher moisture content and vertical stress resulted in greater final vertical displacement of the soil and more significant volumetric strain. When the shear amplitude was equal to or greater than 3 mm，the soil exhibited cyclic shear softening，and the degree of softening increased with larger amplitudes. For moisture contents of 13%，17% and 21%，the average peak shear stress of the soil initially increased and then decreased with increasing shear frequency. However，for a moisture content of 25%，the average peak shear stress of the soil increased with increasing shear frequency.

Key words： rock mechanics granite residual soil water content shear amplitude shear frequency cyclic shear

引用本文:

刘飞禹1，梁崇旭1，王军2，刘洪波3. 不同含水率下花岗岩残积土循环剪切特性研究[J]. 岩石力学与工程学报, 2023, 42(8): 2048-2057.
LIU Feiyu1，LIANG Chongxu1，WANG Jun2，LIU Hongbo3. Study on cyclic shear characteristics of granite residual soil under different water contents. , 2023, 42(8): 2048-2057.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0121 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I8/2048

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