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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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

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	Articles by authors
	LIU Feiyu1
	LIANG Chongxu1
	WANG Jun2
	LIU Hongbo3

Cite this article:

LIU Feiyu1,LIANG Chongxu1,WANG Jun2, et al. Study on cyclic shear characteristics of granite residual soil under different water contents[J]. , 2023, 42(8): 2048-2057.

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

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