ASSESSMENT OF VENTILATION CIRCUITS WITH REGARD TO GEOLOGICAL AND GEOTECHNICAL CONDITIONS OF COAL SEAM MINING

The urgent nature of the study is governed by mining safety and, specifically, by aerological security of mining operations in coal seams with high gas content, prone to spontaneous ignition and rockbursting. This article presents the assessment procedure for longwall ventilation circuits with regard to geological and geotechnical mining conditions. The procedure sets limit application ranges for ventilation circuits in high-production longwalls in coal mines, makes it possible to estimate aerological risk due to presence of diagonals in ventilation circuits, and compares aerological risks at the diagonal stability factor >15. The advantage of the procedure is its ability to estimate such earological risk factors as tendency f coal seams to spontaneous ignition and rock bursts, degassing techniques, gas-suction plants and gas-drainage roadways. The article gives examples of predictive estimation of aerological risk in longwalls in case of different decision-making on gas emission control techniques such as methane-and-air mixture removal from longwalls using a gas-suction plant installed at the mouth of gas-drainage hole drilled from ground surface, or degassing of minedout area. The gas emission control in a longwall reduces general predictive value of aerological risk by 3 times, and the risk level lowers down to a safety standard. The ventilation circuit assessment procedure should be applied during ventilation design planning, aerological safety evaluation, accident location and elimination management and construction of integrated coal mine safety system based on the risk-oriented approach in coal mines.


For citation: Balovtsev S. V. Assessment of ventilation circuits with regard to geological and geotechnical conditions of coal seam mining. MIAB. Mining Inf. Anal. Bull. 2019;(6):173-183. [In Russ]. DOI: 10.25018/0236-1493-2019-06-0-173-183.

Keywords

Аerological safety, aerological accident risk, diagonal connections, spontaneous ignition, rock bursts, degassing, gas-drainage, ventilation design planning.

Issue number: 6
Year: 2019
ISBN: 0236-1493
UDK: 622.831
DOI: 10.25018/0236-1493-2019-06-0-173-183
Authors: Balovtsev S. V.

About authors: S.V. Balovtsev, Cand. Sci. (Eng.), Assistant Professor, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: Balovcev@yandex.ru.

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