硬煤冲击倾向各向异性特征及破坏模式试验研究

doi:10.13722/j.cnki.jrme.2018.1424

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Abstract The impact tendency of coal is a key factor triggering mine impact disasters，and the anisotropy of the impact tendency is resulted from weak structural planes such as beddings. In order to explore the influence of coal bedding on the impact tendency，three groups of standard coal samples collected from Tashan #4 coal seam were processed according to different bedding angles. The wave velocities and the mechanical parameters of the coal samples were respectively measured by the ZBL-U510 non-metal ultrasonic detector and the MTS815.04 rock servo stiffness test system，and the fracture characteristics of the coal samples were analyzed by scanning electron microscopy(SEM). The results show that Tashan #4 coal seam has typical hard coal characteristics and that every mechanical index shows strong anisotropy. The impact tendency of the samples is strongest at 90°of the bedding angle，followed by 0° and weakest at 45°. The stress-strain curves of the coal samples were summarized into three typical forms and the failure modes of the coal samples with different bedding angles were compared and analyzed. Based on the bearing characteristics and the difference of macro damage modes of the coal samples with different bedding angles，the failure modes for the impact tendency ranging from strong to weak are，in turn，sudden instability，progressive instability and ductile instability. The impact tendency of the coal samples with different bedding angles was analyzed from the point of the amount and the speed of energy accumulation and release. The fracture morphology of the coal samples with different bedding angles is different under scanning electron microscopy. The fracture morphologies at 90°，45° and 0° of the bedding angles are respectively smooth columnar，rough and breaking wave with more particles and smooth step. The samples have transgranular and intergranular fracture modes with different energy absorption and fracture speeds，which result in the mesoscopic difference of the impact tendency of the samples.

Key words： mining engineering impact tendency anisotropy energy evolution failure mode scanning electron microscope(SEM)

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	LU Zhiguo1
	2
	JU Wenjun1
	2
	WANG Hao3
	ZHENG Jianwei1
	2
	YI Kang 1
	4
	FENG Youliang1
	2
	SUN Liuwei1
	2

Cite this article:

LU Zhiguo1,2,JU Wenjun1, et al. Experimental study on anisotropic characteristics of impact tendency and failure model of hard coal#br#[J]. , 2019, 38(4): 757-768.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.1424 OR http://www.rockmech.org/EN/Y2019/V38/I4/757

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