单轴多级循环加载下原煤加卸载响应比演化特征

doi:10.13722/j.cnki.jrme.2017.1153

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Abstract In mining engineering，the periodic perturbation to rock mass induced by roadway excavation and mining affects the mechanical properties of surrounding rocks. Thus，studying the failure characteristic of raw coal under cyclic loading will help to understand the damage and deterioration mechanism of coal pillar，and to provide the effective means for the analysis of coal pillar instability. In this study，a uniaxial cyclic loading and unloading experiment at different stress levels on raw coal was conducted. Based on the experiment，a load/unload response ratio was defined according to the variation of elastic modulus to describe the failure characteristics of coal. Another response ratio was defined with the accumulative acoustic emission ring counts to describe the evolution of internal damage of coal. A three-dimensional numerical model was established and studied based on the geometric data obtained by CT scanning. The results show that the evolution of the load/unload response ratio of raw coal under uniaxial cyclic loading has three stages，showing a periodic W-shaped variation at each stress level. Moreover，the load/unload response ratio decreases with the increase of loading stress level. It is also found that the load/unload response ratio drops a little bit and then increases suddenly as the loading stress close to the peak stress. However，the load/unload response ratio reaches minimal and fluctuates near 1 as the specimen is on the verge of damage based on the analysis of acoustic emission ring counts.

Key words： rock mechanics cyclic loading and unloading load/unload response ratio three-dimensional numerical inversion method CT scan

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	ZHAO Yixin1
	2
	3
	GONG Shuang1
	2
	TENG Teng1
	2
	JIANG Yaodong1
	3
	YANG Zhiliang1
	2
	CHEN Kai1

Cite this article:

ZHAO Yixin1,2,3, et al. Characteristics of the load/unload response ratio of raw coal under uniaxial multi-level cyclic loading[J]. , 2018, 37(5): 1096-1105.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1153 OR http://www.rockmech.org/EN/Y2018/V37/I5/1096

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