In order to study the control of mining pressure in narrow coal pillars along goaf roadway in deep high mining and fully mechanized top coal caving face,the return air roadway of 130203 high mining and fully mechanized top coal caving face in the 2-2 thick coal seam of Zaoquan coal mine of Guoneng Ning Coal Group is taken as the engineering object.Based on the practical mining pressure theory,a dynamic structural mechanical model of the internal and external stress fields in the surround-ing rock of the roadway was established.Theoretical and numerical calculations were carried out to compare and analyze the stress of coal pillars of different sizes.The original 15 m protective roadway coal pillar was reduced to 5 m for coal pillar optimization.The results indicate that excavating tunnels in a stable internal stress field is beneficial for the stability of the tunnels,which avoids the occurrence of roof control and rockburst related disasters and accidents.Through the application of a 5m small coal pillar protection tunnel project on site,the deformation on the side of the small coal pillar in the 130203 return air tunnel is 1 050 mm,and the deformation on the solid coal wall is 400 mm.The two sides show asymmetric deformation,and the local floor bulge on the bottom plate is 1 400 mm.The de-sign scheme of using a 5 m small coal pillar to protect the roadway along the goaf in deep and thick coal seam fully mechanized top coal caving mining is reasonable,greatly improving the stress environ-ment of the surrounding rock of the roadway.It has been well applied on site,and the overall design meets the production requirements.The successful application of small coal pillar tunneling technology along the goaf in the 130203 working face provides a reliable scientific basis for the mining of mines.
关键词
深部特厚煤层/大采高综放开采/沿空巷道/煤柱优化/巷道支护
Key words
deep thick coal seams/large mining height and fully-mechanized mining/goaf roadway/coal pillar optimization/tunnel support
维普
万方数据