Abstract
In order to solve the difficult problem of coal wall spalling of soft seam in deep mining, the occurrence mechanism of coal wall spalling in deep mining is studied based on the limit equilibrium theory of D‐P criterion. Through the analysis of the formula of plastic zone, it can be concluded that the coal wall spalling of soft coal seam is related to mining depth, mining height, stress concentration factor, internal friction angle of coal, cohesion, and the compressive strength of coal body. Also, the change of uniaxial compressive strength of soft coal with different moisture content is studied through laboratory experiments. The experimental results show that the uniaxial compressive strength of soft coal reaches the maximum value when the moisture content is about 3.3%. The comprehensive research shows that the cohesion and strength of coal mass can be improved by increasing the working resistance of support, water injection in advanced deep‐hole coal seam of two roadways, and pre‐grouting in shallow hole of coal wall. The control measures can effectively control the coal wall spalling of soft coal seam. The research results have important guiding significance for safe and efficient mining of soft coal seam.
Highlights
As economic development increases the demand for energy and shallow coal resources are gradually depleted, coal mining is forced into the deep underground [1,2,3,4]
E serious coal wall spalling affects the safety of normal production and is the precursor of serious coal and rock dynamic disasters such as coal and gas outburst and rock burst, which will seriously threaten the personnel safety of the mine. erefore, it is necessary to study the mechanism and control measures of coal wall spalling in soft coal seam
It is of great significance for the prevention and control of coal wall spalling in soft coal seam and ensuring the safe and efficient production of coal mines
Summary
As economic development increases the demand for energy and shallow coal resources are gradually depleted, coal mining is forced into the deep underground [1,2,3,4]. Aiming at the control technology of rib spalling of coal seam, Wang [11] concluded that the coal wall spalling in extremely soft coal seam is the main factor affecting the efficient production of the mine and studied the corresponding prevention measures. E effect of grouting reinforcement was verified through different monitoring methods It can be seen from the above research that the influence range of plastic zone is the key to study the mechanism of coal wall spalling in soft coal seam, which is very important for analyzing the influencing factors of coal wall spalling [14,15,16,17,18]. Erefore, it is necessary to study the mechanism and control measures of coal wall spalling in soft coal seam in order to realize the safe and efficient mining of the working face
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