Authors: A.V. Shadrin, A.S. Teleguz

Title of the article: Express-method for determination of optimum parameters for coal and rock mass hydraulic mining using the results of acoustic emission

Year: 2019, Issue: 4, Pages: 5-16

Branch of knowledge: 25.00.20 Geomechanics, rock destruction by explosion, mine aerogasdynamics and mining thermal physics

Index UDK: 622.831.31

DOI: 10.26730/1999-4125-2019-4-5-16

Abstract: The article gives reasons for using express method for determination by means of acoustic emission method of optimum parameters (regimes) for coal seam hydraulic treatment, which are used to control the dynamic phenomena. Optimum parameters are the parameters (speed and pressure of liquid pumping), using which one can reach the purpose of the hydraulic treatment at a minimum time. Efficient way of coal seam hydraulic treatment is determined by its filtration properties. When the filtration coefficient is high, the most efficient way to cope with dynamic phenomena is to use a low-pressure hydrotreatment regime. When using this regime, cracks are not developed and acoustic emission (AE) activity equals the background one, which had been measured before the pumping. When the filtration coefficient obtains average values, coal seam hydraulic loosening becomes an efficient regime. When using coal seam hydraulic loosening, AE activity must get such values that by the moment when the liquid bursts into the mine working the estimated amount of liquid has already been pumped into the borehole. When the filtration coefficient is low, it is advisable to use coal seam hydraulic squeezing. Using this regime, continuous AE activity is recorded. The functional dependences linking the rate and time of pumping with the required volume of injected into the borehole fluid is proved.

Key words: coal seam hydraulic treatment method acoustic emission pumping parameters directional roof hydraulic fracturing

Receiving date: 22.05.2019

Publication date: 19.12.2019

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