Non-destructive testing method and its application on bolt installation quality in coal mine

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[1]	XIAO Tongqiang，LI Huamin，LI Haiyang，WANG Meng. Pull-out properties of bolt with different anchorage length [J]. Journal of Mining & Safety Engineering, 2017, 34(6): 1075-1080.
[2]	XUE Dao-cheng, WU Yu, ZHANG Kai. Experimental study and application on non-destructive testing of bolt axial force in coal mine [J]. Journal of Mining & Safety Engineering, 2013, 30(3): 375-379.

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