Experimental study on the mechanical behaviors and particle breakage characteristics of calcareous sand from South China Sea under repeated one-dimensional impacts

OuYang, Haoran; Dai, Guoliang; Qin, Wenping; Zhang, Chengfeng; Zhu, Wenbo; Gong, Weiming

doi:10.1007/s11440-022-01463-2

Cited by 17 publications

(3 citation statements)

References 41 publications

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“…Therefore, the response characteristics of rock under dynamic loading should be understood to ensure the safety of rock engineering. [1][2][3][4][5] The split Hopkinson pressure bar (SHPB) method is recommended for studying the response characteristics of rock under dynamic loads by International Society for Rock Mechanics 6 and has been applied successfully in the study of the dynamic mechanical response of cemented tailings backfill, 7 the dynamic apparent modulus of calcareous sand, 8 the ratedependent stress-strain responses of limestone and dolomite, 9 the cracking behaviors of granite with persistent fractures, 10 etc. For underground rock engineering, damage is always due to two aspects: One is the sustained static loading from gravity and in situ stress, and the other is the dynamic loading from blasting construction.…”

Section: Introductionmentioning

confidence: 99%

“…12 With the increase in the number of impacts, the energy absorption capacity of calcareous sand exhibits a downwards trend. 8 Every impact causes the mechanical properties of rock to degrade. In the process of damage to failure, there are abundant changes in the nucleation, expansion, connectivity, and interaction of the mesocrack in the rock under the impact load.…”

Section: Introductionmentioning

confidence: 99%

“…The repeated impacts cause the fatigue damage to accumulate in the treated granite 12 . With the increase in the number of impacts, the energy absorption capacity of calcareous sand exhibits a downwards trend 8 . Every impact causes the mechanical properties of rock to degrade.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic response and damage evolution of red sandstone with confining pressure under cyclic impact loading

Wang

Guo

et al. 2022

Fatigue Fract Eng Mat Struct

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Abundant mesoscale damage occurs prior to rock destruction, and the change in porosity can reflect the dynamic mechanical characteristics of the rock. In this study, red sandstone specimens were dynamically loaded by a split Hopkinson pressure bar (SHPB) with confining pressure. The change in porosity was reflected by the new index of porosity variation rate (Rv), and the relationships between the cyclic impact and the dynamic characteristics and porosity variation were analyzed. The average filtering algorithm was emphasized to remove the noise of grayscale NMR images. It was concluded that the number of impacts before crushing gradually decreases with increasing air pressure for the overall trend, there is no obvious rebound, and the energy dissipation increases before the crushing of the specimens. There is an abrupt difference in the dynamic characteristics between the third impact and the fourth impact. The pore space changes from medium and large pores to micropores with impact loading. The peak of the microporous porosity difference curve shifts to smaller micropores. The new index can describe pore closure and expansion. The image processing method used in this work obtained accurate statistical information that confirms the presence of a large number of microcracks before crushing.

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