Strength of artificially frozen silty clay with different negative temperatures under dynamic and static combined loading and deformation characteristic analysis

MA Dongdong1, 2, MA Qinyong1, 2, HUANG Kun1, 2, YUAN Pu1, 2, YAO Zhaoming1, 2

Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (1) : 154-160.

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (1) : 154-160.

Strength of artificially frozen silty clay with different negative temperatures under dynamic and static combined loading and deformation characteristic analysis

  • MA Dongdong1, 2, MA Qinyong1, 2, HUANG Kun1, 2, YUAN Pu1, 2, YAO Zhaoming1, 2
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Abstract

Study the strength and deformation characteristics of frozen soil with various negative temperature conditions under coupled static and dynamic loads had important theoretical and engineering significance for improving the excavation and crush efficiency of frozen soil and ensuring the stability of frozen soil engineering. The static and dynamic stress-strain curve, compressive strength, deformation modulus and failure characteristics of artificial frozen silty clay with various negative temperatures were investigated with the help of a modified split Hopkinson pressure bar (SHPB) system. Test results indicated that under uniaxial dynamic compression condition, with the decrease of test temperature, the proportion of elastic stage of stress-strain curve of artificial frozen silty clay tended to decrease, and the decrease stage after peak stress gradually became obvious. Under three-dimensional coupled static and dynamic load, the stress-strain curves of frozen soil under different negative temperatures could be divided into elastic stage, plastic stage and failure stage. The temperature sensitivity of artificial frozen silty clay under impact load was stronger compared with that under static load, reflected dynamic brittleness characteristic of frozen soil. In addition, under impact loading, the temperature sensitivity of frozen soil under three-dimensional coupled static and dynamic loads was weaker compared with that under uniaxial state. Under dynamic uniaxial load, failure modes of frozen soil specimens with various negative temperatures were crushed. However, there were no obvious cracks for frozen soil under three-dimensional coupled static and dynamic load.

Key words

frozen soil dynamics / artificial frozen silty clay / negative temperature / compressive strength / deformation modulus

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MA Dongdong1, 2, MA Qinyong1, 2, HUANG Kun1, 2, YUAN Pu1, 2, YAO Zhaoming1, 2. Strength of artificially frozen silty clay with different negative temperatures under dynamic and static combined loading and deformation characteristic analysis[J]. Journal of Vibration and Shock, 2022, 41(1): 154-160

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