动静加载下煤的破坏特性及机制的试验研究

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Abstract Failure characteristics and mechanism of coal are the foundation of studying mechanism of rockburst under impact disturbance，which is investigated by the improved split Hopkinson pressure bar(SHPB) in the laboratory. First，based on the regression analysis of experimental data，there are the unique failure characteristics of coal，as fracture half-hard brittle rock，under coupled static and dynamic loads. Then，though the discussion of experimental result，the failure mechanism is analyzed. It is found that the main reason of the unique failure characteristics is the existence of much crack. Main failure mode is brittle expansion of fracture；the dynamic loading leads to crack propagation until to destruction，meanwhile，the static loading mainly changes the number of existing fractures and the size of the elastic energy in the fissures tip. At last，based on the result of the experiment，the rockburst hazad of coal under coupled static and dynamic loads is discussed. We know that there are the critical static loading and the optimal dynamic loading under coupled static and dynamic loads. The strength under the static and dynamic loads of the coal，as a dynamic load resistance index，can reflect the capacity of the resistance to dynamic loads. Fractal dimension，as a dynamic loading energy index，can be used to measure the intensity of dynamic loads damage.

Key words： rock mechanics rockburst under impact disturbance static and dynamic loading failure characteristics crack fractal dimension release rate of elastic energy

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	Articles by authors
	LIU Shaohong1
	2
	LI Fengming3
	LAN Hang1
	2
	PAN Junfeng1
	2
	DU Taotao1
	2

Cite this article:

LIU Shaohong1,2,LI Fengming3, et al. EXPERIMENTAL STUDY OF FAILURE CHARACTERISTICS AND MECHANISM OF COAL UNDER COUPLED STATIC AND DYNAMIC LOADS[J]. , 2013, 32(s2): 3749-3759.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3749

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