A study on mechanical properties and fracture process of sandstone with prefabricated cracks under dynamic loading
SHI Hao1,2,3，ZHANG Houquan2，SONG Lei2，LI Ming2，LI Mingjing1，LIN Gang4，SHI Xin1，LONG Wei1，WU Jiehao1
1.Anhui Key Laboratory of Mining Construction Engineering, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
2.State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China;
3.China Coal Mine Construction Group Corporation Ltd., Hefei 230000, China;
4.Ecole Normale Superieure, Paris 75005, France
摘要深入研究缺陷岩石的动力特性对保障深部煤矿巷道等地下硐室在掘进爆破、老顶来压等强扰动作用下的长效稳定具有重要意义。本文基于天然裂纹长度的幂律分布假设，利用颗粒流软件建立了霍普金森压杆试验系统以及含不同数量分布裂纹的砂岩试件模型，研究了在冲击荷载作用下预制分布裂纹数量对砂岩试件强度、破坏等力学特性的影响。结果显示：（1）随预制裂纹数量NPC（Number of Prefabricated Cracks）的增加，砂岩试件强度近似呈线性减小趋势，而弹性模量降低规律更接近三次方程。并且，随NPC的增加，试件强度、弹性模量的离散性逐渐增大，试件峰后应力的降低过程也更为复杂。（2）随NPC的增加，试件的AE事件曲线由单峰值、高极值向多峰值、低极值转变。（3）冲击荷载作用下，试件中新生裂纹沿应力波传播方向渐进分布，由散斑形式逐渐连通扩展为片层状。并且随NPC的增加，试件的破坏模式由四周破坏形式转变为自左至右的渐弱破坏形式。（4）试件主要沿应力波传播方向发生破裂，并且NPC越少，倾角沿应力波传播方向的新生裂纹占比越大。
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.
石浩1,2,3，张后全2，宋雷2，李明2，黎明镜1，林钢4，施鑫1，龙伟1，吴捷豪1. 动载下含预制裂纹砂岩的力学特性及破裂过程研究[J]. 振动与冲击, 2023, 42(4): 28-38.
SHI Hao1,2,3，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. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(4): 28-38.
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