SHPB test and analysis of cemented silty clay under confining pressure conditions

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (14) : 162-167.

GAO Chang-hui¹ , MA Qin-yong^1,2 , MA Dong-dong¹

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Abstract

To study the dynamic compression characteristics of cemented silty clay under confining pressure conditions, a series of split Hopkinson pressure bar (SHPB) tests were carried out under different confining pressures and strain rates. The effects of confining pressure and strain rate on the dynamic stressstrain curve, dynamic compression strength and failure mode of cemented silty clay were analyzed. The results show that the dynamic stressstrain curve of cemented silty clay includes three stages, namely, the elastic deformation, plastic deformation and failure stages. However, the failure modes of cemented silty clay are different in different stress states. Under uniaxial compression condition, the failure degree of cemented silty clay becomes serious gradually with the increase of strain rate, yet it shows a better integrity under confining pressure condition. Both the confining pressure and strain rate have an effect on the dynamic compression strength of cemented silty clay. At the same strain rate, the dynamic compression strength of cemented silty clay increases with the increase of confining pressure. Under the same confining pressure, the peak stress and peak strain of cemented silty clay increase with the strain rate increasing, which shows an obvious strain rate effect.

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cemented silty clay / confining pressure / SHPB test / dynamic compression strength / strain rate effect

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GAO Chang-hui1,MA Qin-yong1,2,MA Dong-dong1 . SHPB test and analysis of cemented silty clay under confining pressure conditions[J]. Journal of Vibration and Shock, 2018, 37(14): 162-167

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