Stress distribution characteristics and support control of small coal pillar
In order to improve the utilization rate of coal resources and boost mine production efficiency and economic bene-fits,the retention of small coal pillars has become an inevitable trend in the development of mine production,and the re-search on the stress evolution law,distribution characteristics and control technology of small coal pillars is very important for the realization of small coal pillar roadway protection.In this paper,the 3-1 coal seam of Hanjiawan Coal Mine being taken as the research background,the theoretical analysis,numerical simulation and field measurement are used to verify the stress distribution characteristics and optimal support scheme of small coal pillar.Based on the actual situation of the site,the mechanical model in the mining process of the working face is constructed,and the stress distribution characteristics and evolution law of the coal pillar between the faces are analyzed.Combined with the field measurement method,the stress evo-lution process when the small coal pillar is 10 m in the mining process of the working face is analyzed.According to the stress distribution characteristics,the numerical calculation method is used to determine the feasibility of the small coal pil-lar optimization support scheme.The analysis shows that the support effect is good and can meet the safety production re-quirements.The research results provide technical reference for the design and support of small coal pillars in similar mines.
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