摘要
为了解决小煤柱沿空掘巷综放开采过程中沿空巷道矿压显现剧烈、变形严重的难题,采用本煤层布置卸压巷的方法对沿空巷道进行围岩控制,通过数值模拟方法研究了卸压巷在厚煤层的层位、卸压巷与沿空巷的巷道中心距、卸压巷的面积3个因素对卸压巷的卸压效果的影响,并对卸压巷的布置方式进行优化。结果表明:布置卸压巷降低了实体煤应力集中系数,减小应力集中区域面积,使应力集中向煤体深部转移,减小了沿空巷道围岩应力;最优化卸压巷布置方式是卸压巷在厚煤层中挑顶布置,巷道中心距为沿空巷道宽度的2.7~3.2倍,巷道尺寸与沿空巷道相同。该布置方式运用在现场,取得良好技术经济效益。
In order to solve difficult problems of serious mine strata behavior and serious deformation occurred in the gateway driven along the goaf during fully mechanized top coal caving mining process with small coal pillar gateway driven along the goaf,the pressure relief gateway layout method in mining seam was applied to surrounding rock control of the gateway driven along the goaf.The numerical simulation method was applied to study pressure relief gateway in layer location of thick seam,the central distance between pressure relief gateway and gateway retained along goaf and the dimension of pressure relief gateway factors affected to pressure relief effect of the pressure relief gateway.An optimization was conducted on the layout method of the pressure relief gateway.The results showed that layout of pressure relief gateway could reduce stress concentration coefficient of solid coal,and area of stress concentration block,could make stress concentration moving forward to deep section of the seam and could reduce the surrounding rock stress of the gateway retained along the goaf.The best optimized layout method of pressure relief gateway was that pressure relief gateway should have a ripping layout in thick seam,the center distance of pressure relief gateway would be 2.7 ~ 3.2 times of width of gateway retained along the goaf and size of pressure relief gateway should be the same as gateway retained along the goaf.The layout method was applied to mine site with excellent technical and economic benefits.
出处
《煤炭科学技术》
CAS
北大核心
2017年第2期34-38,共5页
Coal Science and Technology
基金
国家自然科学基金资助项目(51274133
51374140)
高等学校博士学科点专项科研基金资助项目(20123718110013)
关键词
沿空掘巷
卸压巷
巷道中心距
巷道布置
gateway driven along goaf
pressure relief gateway
center distance of gateway
gateway layout
