真三轴下注水条件对煤体超声波传播特性影响规律的研究

doi:10.13722/j.cnki.jrme.2022.0067

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Abstract Coal seam water injection has a significant effect on preventing coal and gas outburst，reducing dust and cooling，softening coal seam pressure relief and anti-scour. Monitoring the migration law of water in the coal seam and obtaining an effective hydraulic wetting range are very necessary to evaluate the wetting effect of coal water injection. Therefore，in this paper，the water injection experiment is carried out on the coal body under the true triaxial state，and the ultrasonic self-excitation is supplemented. Technical monitoring records the characteristic parameters of coal transmission ultrasonic wave under different water injection conditions，and analysis of the relationship between water injection conditions and characteristic parameters such as longitudinal wave velocity，amplitude and attenuation coefficient is carried out. The results show that：(1) The amount of water injection increases with the water injection pressure and presents a linear stable state，but as the water injection time increases，the growth rate of the water injection gradually decreases and tends to zero. (2) The ultrasonic wave velocity has a linear positive correlation with the water injection pressure，and the wave velocity increment is basically stable with the increase of the water injection pressure；the wave velocity has an exponential positive correlation with the water injection time，but the sensitivity to the water injection time is gradually weakened；Wave velocity characterization of bulk modulus. (3) With the increase of water injection pressure，the ultrasonic amplitude increases as a whole，and the attenuation coefficient decreases as a whole；the sensitivity of ultrasonic amplitude and attenuation coefficient to water injection time is low-high-low. (4) The ringing count and the like are linearly positively correlated with the water injection pressure，and have an exponential positive correlation with the water injection time，and have a good consistency with the changing trend of the water injection amount.

Key words： mining engineering coal seam water injection true triaxial ultrasound coal wetting characteristics of propagation parameters of waveform

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	Articles by authors
	WANG Gang1
	2
	LI Shengpeng1
	2
	LIU Yixin1
	2
	FENG Jing1
	2
	LI Huaixing1
	2

Cite this article:

WANG Gang1,2,LI Shengpeng1, et al. Influence of water injection on ultrasonic propagation characteristics of coal under true triaxial stress[J]. , 2022, 41(11): 2225-2239.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0067 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I11/2225

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