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

被引：0
|
作者：
Shi H. [1 ,2 ,3 ]
Zhang H. [2 ]
Song L. [2 ]
Li M. [2 ]
Li M. [2 ]
Lin G. [4 ]
Shi X. [1 ]
Long W. [1 ]
Wu J. [1 ]
机构：
[1] Anhui Key Laboratory of Mining Construction Engineering, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan
[2] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou
[3] China Coal Mine Construction Group Corporation Ltd., Hefei
[4] Ecole Normale Superieure, Paris
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 04期
关键词：
number of prefabricated cracks; power-law distributed cracks; sandstone dynamic properties; split Hopkinson pressure bar simulation by particle flow code;
D O I：
10.13465/j.cnki.jvs.2023.04.004
中图分类号：
学科分类号：
摘要：
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. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：28 / 38
页数：10
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