A study on mechanical properties and fracture process of sandstone with prefabricated cracks under dynamic loading

SHI Hao1,2,3,ZHANG Houquan2,SONG Lei2,LI Ming2,LI Mingjing1,LIN Gang4,SHI Xin1,LONG Wei1,WU Jiehao1

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 28-38.

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 28-38.

A study on mechanical properties and fracture process of sandstone with prefabricated cracks under dynamic loading

  • SHI Hao1,2,3,ZHANG Houquan2,SONG Lei2,LI Ming2,LI Mingjing1,LIN Gang4,SHI Xin1,LONG Wei1,WU Jiehao1
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Abstract

The in-depth study on the dynamic characteristics of defective rock is of great significance to ensure the long-term stability of underground chambers such as deep coal mine roadway under strong disturbance actions like excavation blasting and main roof pressure. Based on the power-law distribution assumption of natural crack length, the Split Hopkinson Pressure Bar test system and the sandstone specimen model with different number of distributed pre-cracks are established by Particle Flow Code software. The effects of distributed pre-crack number on the strength and failure of sandstone specimens are studied. The results show that: (1) With the increase of the number of prefabricated cracks (NPC), the strength of the sandstone specimen decreases approximately linearly, while the decreasing law of the elastic modulus is closer to the cubic equation. Moreover, with the increase of NPC, the discreteness of the specimen strength and elastic modulus gradually increase, and the reduction process of the post-peak stress is also more complicated. (2) With the increase of NPC, the AE event curve of the specimen changed from the form of single peak and high extreme value to the form of multi-peak and low extreme value. (3) Under the action of impact load, the new cracks gradually distributed along the propagation direction of stress wave, and communicated and expanded from speckle form to lamellar form. And with the increase of NPC, the failure mode of the specimen changed from the surrounding failure mode to the weakening failure mode from left to right. (4) The specimens mainly fracture along the propagation direction of the stress wave, and the fewer NPCs, the larger the proportion of new cracks along the propagation direction of the stress wave.

Key words

split Hopkinson pressure bar simulation by particle flow code / power-law distributed cracks / number of prefabricated cracks / sandstone dynamic properties

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SHI Hao1,2,3,ZHANG Houquan2,SONG Lei2,LI Ming2,LI Mingjing1,LIN Gang4,SHI Xin1,LONG Wei1,WU Jiehao1. A study on mechanical properties and fracture process of sandstone with prefabricated cracks under dynamic loading[J]. Journal of Vibration and Shock, 2023, 42(4): 28-38

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