厚煤层小煤柱沿空掘巷围岩控制技术研究

Surrounding Rock Control Technology for Gob Side Entry Driving with Small Coal Pillars in Thick Coal Seam

程庄煤矿15#煤层原采用25~30 m大煤柱护巷,导致临空巷道动压大、维护困难,且资源浪费较严重。以15308综放工作面为工程背景,通过使用理论计算、工程类比等手段,确定了最佳小煤柱护巷尺寸为6 m,同时采用爆破切顶、优化巷道支护参数,并配合注浆加固、喷浆、卸压槽等诸多措施,实现了小煤柱的沿空掘巷,既降低了临空巷道动压对巷道的影响,又减少了煤炭资源的浪费,延长了矿井服务年限。

The 15#coal seam in Chengzhuang Coal Mine originally used 25-30 m large coal pillars to protect the roadway,which was difficult to maintain due to high dynamic pressure and severe resource waste.Taking the 15308 fully-mechanized top coal caving face as the engineering background,the optimal size of the small coal pillar support roadway was determined to be 6 m through theoretical calculations,engineering analogies and other methods.By using blasting to cut the roof,optimizing the roadway support parameters,and cooperating with grouting reinforcement,spraying,and pressure relief grooves,the gob side entry driving with small coal pillars was achieved,which not only reduced the impact of dynamic pressure on the roadway in the goaf,but also reduced the waste of coal resources and extended the service life of the mine.