Dynamic characteristics and damage mechanism of freeze-thaw treated red sandstone under cyclic impact

ZHANG Rongrong; SHEN Yonghui; MA Dongdong; PING Qi; YANG Yi

doi:10.11883/bzycj-2023-0449

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ZHANG Rongrong, SHEN Yonghui, MA Dongdong, PING Qi, YANG Yi. Dynamic characteristics and damage mechanism of freeze-thaw treated red sandstone under cyclic impact[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0449

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ZHANG Rongrong, SHEN Yonghui, MA Dongdong, PING Qi, YANG Yi. Dynamic characteristics and damage mechanism of freeze-thaw treated red sandstone under cyclic impact[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0449

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Dynamic characteristics and damage mechanism of freeze-thaw treated red sandstone under cyclic impact

doi: 10.11883/bzycj-2023-0449

ZHANG Rongrong^{1, 2
,},
SHEN Yonghui¹,
MA Dongdong^{1, 2
,
,},
PING Qi^{1, 2},
YANG Yi¹

1.
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan 232001, Anhui, China

Received Date: 2023-12-18
Rev Recd Date: 2024-02-29

Available Online: 2024-03-20

Abstract

Abstract

Studying the strength, deformation and damage mechanism of freeze-thaw treated rock mass under the action of cyclic dynamic disturbance was of important significance for reducing engineering disasters and improving rock breaking efficiency in cold regions. The cyclic impact tests of freeze-thaw treated red sandstone under two kinds of impact pressure were carried out to investigate the effects of cyclic impact number and freeze-thaw number on stress wave propagation, dynamic stress-strain curve, peak stress, and peak strain. In addition, the calculation method of cumulative damage factor, which can comprehensive consider the effects of cyclic impact and freeze-thaw, is proposed based on the Lemaitre strain equivalence principle. Finally, the microstructure characteristics of red sandstone after freeze-thaw and cyclic impact are analyzed in detail. Results show that red sandstone specimens treated with different freeze-thaw number show tensile failure mode under cyclic impact load. The cyclic impact number that red sandstone specimen can withstand is negatively correlated with freeze-thaw cycle number, and red sandstone specimen after 75 freeze-thaw cycles treatments reaches the failure state after the first impact loading. Moreover, the cyclic impact number mainly affects the jump point, abscissa corresponding to peak point and amplitude of transmitted waves, and the amplitude of reflected waves. While the freeze-thaw number shows a great effect on the jump point, abscissa corresponding to peak point, and amplitude of transmitted waves during the first impact process. The cumulative damage factor of red sandstone specimen exhibits a good negative correlation with the dynamic peak stress. After the combination effects of freeze-thaw and cyclic impact, the cracks inside red sandstone spread along the grain boundary and connect with the pores to form a complex network.
- cyclic impact,
- red sandstone,
- freeze-thaw cycle,
- split Hopkinson pressure bar,
- cumulative damage factor

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References(45)

References

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