单轴压缩下宏观裂纹倾角对煤体特性影响研究

doi:10.13722/j.cnki.jrme.2016.0878

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Abstract To investigate the influence of macro-crack dip angles on the coal characteristics，acoustic emission(AE) tests under uniaxial compression of coal samples with different dip angles pre-existing crack were carried out by YAW4306 electric mechanical test system and CTA–1 acoustic emission monitor. AE signal characteristics in test process were analyzed，and the effects of macro-crack dip angles on AE response characteristics，peak stress and crack propagation modes were studied. The results show that：the existence of macro-cracks in specimen under uniaxial compression has a significant impact on AE signals，and the response of AE signals is of high consistency with the applied load，so it can well reflect the internal rupture development when macroscopic defects appear under uniaxial compression. The peak stress increase with the dip angles of the cracks，which presents quadratic function relationship by curve fitting. When the dip angle of pre-existing cracks is 0°，15°，30°and 45°respectively，the major crack morphology of coal samples in the failure process is wing crack，accompanied by subtle secondary cracks. While the dip angle rises to 60°and 75°，anti-wing cracks appear on the surface of the coal specimen. There is no obvious propagating crack on the surface when the dip angle reaches to 90°，and the coal samples show a splitting failure mode.

Key words： rock mechanics macro-crack acoustic emission(AE) peak strength crack propagation modes

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	Articles by authors
	LI Dexing1
	2
	WANG Enyuan1
	2
	LI Nan3
	KONG Xiangguo1
	2
	WANG Xiaoran1
	2

Cite this article:

LI Dexing1,2,WANG Enyuan1, et al. Research on the coal characteristics of macro-crack dip angles under uniaxial compression[J]. , 2017, 36(4): 3206-3214.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0878 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I4/3206

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