Study on cyclic shear characteristics of granite residual soil under different water contents
LIU Feiyu1，LIANG Chongxu1，WANG Jun2，LIU Hongbo3
(1. College of Mechanics and Engineering Science，Shanghai University，Shanghai 200444，China；2. College of Architecture and Civil Engineering，Wenzhou University，Wenzhou，Zhejiang 325035，China；3. GZEPI Zhengcheng Environmental Protection Energy Co.，Ltd.，Guangzhou，Guangdong 511300，China)
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.
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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2023, Vol. 42 
