煤矿巷道底板锚固孔钻渣尺寸特征实验研究

doi:10.13722/j.cnki.jrme.2019.0855

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Abstract The difficulty of rock fragment discharging from small diameter boreholes drilled at a downward angle in coal mine roadway floors has long been the major factor that reduces borehole quality. Therefore，fuller understanding of rock fragment sizes is absolutely essential to fragments discharging. In this study，theoretical analysis and laboratory experiments were adopted to analyze the size characteristics of rock fragments formed by two-wring drill bits. The results indicate that the strength of rocks and bit blade spacing are the two keys factors that affect the mean fragment size. The proportion of larger-size fragments increases with the uniaxial compressive strength，which makes the mean fragment size increase with the uniaxial compressive strength as well. The rotation rate and drilling rate have no influence on the mean fragment size. In addition，the mean fragment size increases with the blade spacing. Therefore，the mean fragment size can be reduced by reducing the spacing between two wings. When drilling through high strength rock strata，the mean size of the fragments will increase and the discharge power should be enhanced to prevent fragment discharge blockages. This paper may provide a theoretical basis for discharge power settings and drilling tool optimization.

Key words： mining engineering roof bolting floor heave control borehole in roadway floor rock fragment size

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	Articles by authors
	LIU Shaowei1
	2
	3
	FU Mengxiong1
	JIA Housheng1
	2
	ZHANG Weiguang3

Cite this article:

LIU Shaowei1,2,3, et al. Experimental study on the size characteristics of rock fragments during borehole drilling in coal mine roadway floors#br#[J]. , 2020, 39(7): 1343-1355.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0855 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I7/1343

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