Experimental study on dynamic compression of unsaturated calcareous sand

ZHAO Zhangyong; QIU Yanyu; ZI Min; XING Huadao; WANG Mingyang

doi:10.11883/bzycj-2019-0066

Volume 40 Issue 2

Jan. 2020

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ZHAO Zhangyong, QIU Yanyu, ZI Min, XING Huadao, WANG Mingyang. Experimental study on dynamic compression of unsaturated calcareous sand[J]. Explosion And Shock Waves, 2020, 40(2): 023102. doi: 10.11883/bzycj-2019-0066

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ZHAO Zhangyong, QIU Yanyu, ZI Min, XING Huadao, WANG Mingyang. Experimental study on dynamic compression of unsaturated calcareous sand[J]. Explosion And Shock Waves, 2020, 40(2): 023102. doi: 10.11883/bzycj-2019-0066

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Experimental study on dynamic compression of unsaturated calcareous sand

doi: 10.11883/bzycj-2019-0066

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, the Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
3.
Navy 91058 Force, Sanya 572000, Hainan, China

Received Date: 2019-03-04
Rev Recd Date: 2019-05-23

Available Online: 2020-01-25

Publish Date: 2020-02-01

Abstract

Abstract

The dynamic compression tests of calcareous sands with different moisture contents under quasi-one-dimensional strain conditions were carried out using a calibrated SHPB system in the average strain rate ranging from 209 s⁻¹ to 1137 s⁻¹. The test results show that the calibration of the sensitivity coefficient of the semiconductor strain gauge and the dispersion of the pressure bar have a significant influence on the accuracy of the test results. When the strain of the calcareous sand is below 0.025, the tangential modulus of moist calcareous sand is higher than that of dry sand, but the opposite is true when the strain is above 0.025. The tangential modulus of moist samples decreases first and then increases with the increase of the water content. By analyzing the variation of axial stress-strain curve and lateral pressure coefficient of unsaturated calcareous sand after lock-in phenomenon, a model of the phenomenon of unsaturated calcareous sand is proposed.
- unsaturated calcareous sand,
- moist content,
- split Hopkinson pressure bar,
- semiconductor strain gauge,
- lateral pressure coefficient,
- lock-in phenomenon

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References

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