沿空掘巷窄煤柱应力计算方法研究

Narrow Coal Pillar Stress Calculation of God Side Entry Retaining

分析工作面侧向覆岩移动规律,提出上覆岩层弯曲下沉带三角形结构。通过理论分析,提出不同岩性顶板条件下沿空掘巷窄煤柱载荷的计算公式,在柳巷煤矿中硬顶板条件下,采高11.05m,巷道宽度4.86m,高度3.42m,煤柱宽度10m,计算得煤柱应力2.78MPa,现场煤柱中布置4个钻孔应力计,监测数据平均值为2.83MPa,窄煤柱应力理论计算值是现场监测数据的98%,基本吻合。

The overlying strata movement principle along lateral of working face was analyzed,and then triangle structure of bending and subsidence belt of overlying strata was put forward.According theoretical analysis,the formula of narrow pillar loading of gob side entry under different roof condition was put forward,based on the roof condition of Liuxiang coal mine,mining height was 11.05m,roadway width 4.86m,hight was 3.42m,coal pillar width was 10m,and then coal pillar stress 2.78MPa was derived,about four borehole stressmeters were layout in coal pillar in field,the average monitoring data was 2.83MPa,the theoretical value was about 98% of field monitoring data.