浸水次数对煤样裂隙发育损伤的实验研究

doi:10.13722/j.cnki.jrme.2015.1720

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Abstract Underground water has repeated intrusion on waterproof coal pillars and on underground reservoir boundaries. Therefore，researching the damaging effect of water intrusion times on crack propagation in coal gives meaningful advice to cope with problems，such as setting the width of water proof coal pillars and storing underground water in arid region of the West China. In this paper，coal samples were wetted by self-made humidifier and then were grouped into dry coal samples，coal samples under once water intrusion，twice water intrusion，third water intrusion and forth water intrusion. By acoustic emission testing，this research found the peak stress and elastic modulus decreased with the growth of water intrusion times but peak strain increased because of the rising water intrusion times. The stiffness-stress curve and accumulative AE counts combined with overall strain-stress curve could evaluate all phases of crack propagation. With the growing times of water intrusion，the stress thresholds of crack closure，crack initiation and crack damage declined linearly. Nevertheless，the percentage of three stress thresholds over peak stress did not vary with the change of water-intrusion times，with 15.52%，31.04% and 67.81% respectively. The experimental results can partly help set the width of waterproof coal pillars and of underground reservoir boundaries.

Key words： rock mechanics water storage in coal mine crack propagation stress thresholds crack damage acoustic emission

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	Articles by authors
	CHEN Tian1
	YAO Qiangling1
	DU Mao2
	ZHU Chenguang3
	ZHANG Bo1

Cite this article:

CHEN Tian1,YAO Qiangling1,DU Mao2, et al. Experimental research of effect of water intrusion times on crack propagation in coal[J]. , 2016, 35(S2): 3756-3762.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1720 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3756

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