Formation of the Aerogas Situation in a Working Face while Mining Callows with Top Coal Caving onto Conveyor

Leonid Shevchenko,Yevgeny Buryakov,V A Zubareva

doi:10.1051/e3sconf/202017401050

Leonid Shevchenko, Yevgeny Buryakov + Show 1 more

Open Access

https://doi.org/10.1051/e3sconf/202017401050

Copy DOI

Abstract

The processes of gas emission into the working face from coal, cut by the mining machine with the simultaneous top coal caving on- to the conveyor located behind the powered support units, are considered. The presence of two methane emission sources in the face requires addi- tional measures to ensure the aerologic safety of mining. Given the high rate of mining operations due to the performance of modern cutting ma- chines, there is a problem of maintaining the methane concentration in the upcast at a level of 1%. In this case, gas released from the coal mass caved onto the rear conveyor is partially added to the volume of gas released from the cut coal into the face, which generally increases the absolute gas content in the stope. Measures are proposed to contain the growth of gas content in the face in the form of alternations of machined coal breaking and top coal caving processes, which do not overlap in time during the en- tire mining cycle. Due to the fact that this technology is experimental, its adaptation to mining and geological conditions of mines is required.

Highlights

The Kuznetsk coal basin is characterized by a wide variety of geological conditions of the occurrence of coal seams of different thicknesses and incidence angles, as well as a wide range of fossil coal grades
Studies conducted by the Kuzbass Polytechnic Institute in the 80s of the previous century on the gas content of each slice showed that it is distributed extremely unevenly and decreases with each slice, while the ratio of the average gas content of the first and last slices is from 1.6 to 2.75
In order to avoid complications of the air and gas situation in the face, the processes of machined coal mining the top coal caving are separated in time

Summary

Introduction

The Kuznetsk coal basin is characterized by a wide variety of geological conditions of the occurrence of coal seams of different thicknesses and incidence angles, as well as a wide range of fossil coal grades This determined the presence of various - more than ten - coal mining systems for each district of Kuzbass. Underground mining of steeply sloping seams in Prokopyevsky-Kiselevsky, Anzhersky and Kemerovsky districts of Kuzbass has been completely stopped and coal is mainly mined from flat seams, where it is possible to introduce high-performance new generation cutting-and-loading machines. These are mainly Leninsky, Belovsky, Kemerovsky and Tomusinsky districts of Kuzbass. The third slice having been mined; this process is conducted twice [1, 2]

Methods

Results

Conclusion