CONNECTION OF ACOUSTIC EMISSION PARAMETERS WITH FILTRATION-COLLECTIVE PROPERTIES OF THE MASSIF AND THE PUMP UNIT PERFORMANCE FOR HYDRAULIC PROCESSING OF ROOF AND COAL-LAYER
Journal Title: Вестник научного центра по безопасности работ в угольной промышленности - Year 2018, Vol 0, Issue 1
Abstract
The results of studies on the establishment of functional relationships between the acoustic emission (AE) parameters and the filtration-collection and strength properties of the rock mass were presented, as well as the parameters of the pumping unit for several methods of hydroprocessing a mountain massif in coal mines in order to reduce the danger of dynamic phenomena. It was shown that for effective low-pressure humidification of coal, the activity of the AE should not exceed the background value measured before the injection of liquid into the mountain mass. When the formation is hydrodisturbed, the activity of the AE acquires an additional to the background component, which is determined by the porosity and permeability of the formation, the viscosity of the liquid, the pressure drop of the fluid from the crack walls to the filtration front, the geometric dimensions and orientation angles of the developing cracks, the ratio of the vertical and horizontal components of the rock pressure, and the time of injection. Moreover, the dependence of the AE activity on time at a constant injection rate is such that when the fluid pressure in the well rises at the initial stage, it rapidly increases from the background value to the maximum value, and then decreases as the size of cracks and the filtration flow of liquid into their walls increase. With an increase in the injection rate, the time to breakthrough the fluid along the growing cracks on the face and the volume of the injected liquid decreases, and the AE activity values increase. With the directed fracture of the roof of the formation, the length of the growing crack is related to the total number of pulses of the AE by an exponential dependence, which makes it possible to estimate the length and area of the growing crack from the measured number of AE pulses. The study was carried out through a grant from the Russian Science Foundation (project No. 17-17-01143).
Authors and Affiliations
A. V. Shadrin, V. I. Klishin
Keywords
Related Articles
- EP ID EP646182
- DOI -
- Views 96
- Downloads 0
BELT CONVEYOR SPEED CONTROL AUTOMATED SYSTEM AS THE MEAN OF ITS OPERATIONAL SAFETY INCREASE
The article describes mine conveyor operational safety increase method as many fires take place on belt conveyors due to the belt high movement speed and the rollers high rotation speed. Also the belt rupture may take pl...
ON BELT CONVEYOR FIRE POSSIBILITY CAUSED BY COAL CHIPPING IGNITION
In coal industry three areas of re safety on conveyor belts are formed: the creation and application of non ammable (slow-burning) conveyor belts; development and application of belt conveyor operation and management co...
TESTING OF INTEGRATED MODULES FOR EXTINGUISHING UNDERGROUND FIRES AND PREVENTING COAL DUST EXPLOSIONS
The article deals with the results of experimental determination of fire-extinguishing capacity of the integrated module developed for the rescue complex on the basis of monorail mine transport. The complex provides fire...
METHODS AND MEANS OF AUTOMATIC CONTINUOUS MONITORING OF DUST CONCENTRATION AND DUST CONTROL IN THERMAL POWER PLANTS OPERATING ON COAL
In Russia today, there are 358 thermal power plants of large and medium electric power capacity (more than 25 MW). The urgent problem of safety at TРР enterprises is the problem of coal dust emission, which affects both...
PRIMENENIYE TEKHNOLOGII GIDRORAZRYVA UGOL'NOGO PLASTA PRI PROVEDENII PODGOTOVITEL'NYKH VYRABOTOK [HYDRAULIC DESTRUCTION METHOD APPLICATION FOR PREPARATORY OPENING HEADING]
Results of researches in the eld of a coal seam hydraulic destruction application at carrying out of preparatory opening heading through high gas containing coal seams with the purpose of gas and gas-dynamic danger decr...