Large-scale dynamic triaxial tests and dynamic characteristics of clay contaminated round gravel under subway cyclic load

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (7) : 245-254.

MA Shaokun1,2, TIAN Fapai1, HUANG Haijun1, ZHANG Jiabing1,2, DUAN Zhibo3, GONG Jian1,2

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Abstract

In order to investigate the long-term dynamic properties of clay-fouled round under cyclic subway loading, a series of saturated undrained dynamic triaxial tests were carried out by utilizing the GDS large-scale triaxial cyclic test system. The influence of clay fouling level (VCI) on round gravel's long-term dynamic properties under different confining pressures and dynamic stress amplitudes was analyzed. The experimental results show that with the increase of VCI, the cumulative plastic strain of the specimen shows a tendency of increasing and then decreasing, and the fouled clay changes from lubrication to filling. When the confining pressure is 100 kPa, the cut-off VCI is 30%, and when the confining pressure is 200 kPa and 300 kPa, the cut-off VCI is 20%. VCI has a large impact on shallow buried subway tunnels (σ3= 100 kPa), which threatens the safety of traveling, while it has a small impact on deep buried subway tunnels (σ3= 200 kPa, 300 kPa), which makes the subway operation relatively safe. With the increase of VCI, the elastic strain and dynamic pore-pressure ratio of the specimens first increased and then decreased, while the resilience modulus first decreased and then increased. However, the trends of all three changes become more obvious with the decrease of confining pressure and the increase of dynamic stress amplitude. Generally, the research results can be used as a reference for designing subway roadbed structures and their post-construction settlement predictions.

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cyclic loading / round gravel / clay fouling level / dynamic characteristics

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MA Shaokun1,2, TIAN Fapai1, HUANG Haijun1, ZHANG Jiabing1,2, DUAN Zhibo3, GONG Jian1,2. Large-scale dynamic triaxial tests and dynamic characteristics of clay contaminated round gravel under subway cyclic load[J]. Journal of Vibration and Shock, 2024, 43(7): 245-254

References

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