Analysis and Research on the Strength of Overhead Support for Narrow Coal Pillar Mining Face
Low carbon and efficient development and utilizatio n are inevitable ways for sustainable development of coal mines,and narrow coal pillar mining has advantages such as improving resource recovery rate,reducing coal cost per ton,and extending mine service life.Meanwhile,narrow coal pillar mining can also cause significant changes in the stress environment of the roadway.It is necessary and urgent to analyze and study whether the advanced support strength of narrow coal pillar fully mechanized mining face meets the requirements through Flac3D numerical simulation method to study the stability of the roadway during mining.According to numerical simulation analysis,it can be concluded that under the condition of a 5 m narrow coal pillar,a 30 m advance support method of single column+π-shaped steel beam is adopted in the longitudinal tunnel,supplemented by grouting anchor cable reinforcement,which can provide a certain lateral constraint force for the narrow coal pillar.The narrow coal pillar has been transformed from double-sided to single-sided,thereby improving the bearing capacity of the coal pillar and effectively controlling the plastic zone evolution of the coal pillar and coal wall,ensuring the safety of coal mining operations.
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