Research on cumulative plastic strain characteristics of granite residual soil under cyclic loading

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (4) : 87-95.

YIN Song1,2，LIU Pengfei2，SUN Yuzhou2，LI Xinming2，YAN Pan2，WANG Zhiliu2

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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.

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

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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[J]. Journal of Vibration and Shock, 2024, 43(4): 87-95

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