特厚煤层工作面区段煤柱宽度优化研究

Optimization of district coal pillar width for working face in extra-thick coal seam

针对特厚煤层条件下沿空掘巷区段煤柱合理宽度留设问题,以龙王沟煤矿为工程背景,建立了煤柱宽度的计算模型,并通过现场矿压数据分析、理论计算、数值模拟、工程类比及现场应用相结合的研究方法对区段煤柱留设的宽度进行了分析探讨,结果表明:当煤柱宽度为6 m时,顶板、煤柱塑性区与采空区贯通,煤柱承载能力弱,破坏严重,当煤柱宽度大于8 m时,煤柱塑性区未与采空区完全贯通,仍具有一定的承载能力。

In response to the problem of reasonable width retention of district coal pillars for gob-side entry driving the condition in extra-thick coal seams,a calculation model for the width of coal pillars was established based on the engineering background of Longwanggou Coal Mine.The width of coal pillars in the section was analyzed and discussed through a combination of on-site rock pressure data analysis,theoretical calculation,numerical simulation,engineering analogy,and onsite application.The results showed that when the width of coal pillars was 6 m,the plastic zone of the roof and coal pillar is connected to the goaf,and the bearing capacity of the coal pillar is weak and severely damaged;When the width of the coal pillar is greater than 8 m,the plastic zone of the coal pillar is not fully connected to the goaf and still has a certain bearing capacity.