Tests for dynamic mechanical properties of coal impact compression under passive confining pressure
JIAO Zhenhua1, MU Chaomin2, WANG Lei1, CUI Zhili3, YUAN Qiupeng1, ZOU Peng1, WANG Jiong2
1. State Key Lab of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan 232001, China;
2. School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China;
3. School of Mechanics and Optoelectronic Physics, Anhui University of Science and Technology, Huainan 232001, China
Abstract：In order to study the dynamic mechanical properties of coal under impact load, Split Hopkinson Pressure Bar test system was used to carry out the impact compression tests of coal samples under different strain rates and different stress states by exerting circumferential constraints through the steel sleeve. The results show that: the strain rate and constraint state both have significant influence on the stress-strain behavior and failure mode of coal samples. With the increase of strain rate, the stress-strain curve of coal sample under passive confining pressure has obvious yield platform, and the plastic flow enhanced. When the strain rate ranges from 30.4 s-1 to 328.7s-1, under radial free condition the peak stress of coal sample is 15.32-69.53MPa, and under passive confining pressure is 15.11-104.46MPa. When the strain rate is higher than 100s-1, the peak stress of coal sample under passive confining pressure is significantly higher than that under radial free condition. Due to the passive confining pressure of sleeve constraint, the failure mode of coal sample trend to compress shear failure mode, which is obviously different from the brittle fracture under radial free condition. Under the impact load, the passive confining pressure of coal sample is in the process of unconstant change, and the passive confining pressure increases rapidly with the increase of axial pressure, which show a positive quadratic function relationship.
焦振华1，穆朝民2，王磊1，崔智丽3，袁秋鹏1，邹鹏1，王炯2. 被动围压下煤冲击压缩动态力学特性试验研究[J]. 振动与冲击, 2021, 40(21): 185-193.
JIAO Zhenhua1, MU Chaomin2, WANG Lei1, CUI Zhili3, YUAN Qiupeng1, ZOU Peng1, WANG Jiong2. Tests for dynamic mechanical properties of coal impact compression under passive confining pressure. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(21): 185-193.
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