摘要
针对大断面综放沿空掘巷窄煤柱宽度确定的难题,通过数值试验方法研究不同宽度窄煤柱的变形破坏与受力分布规律,确定了窄煤柱合理宽度并成功应用于工程实践。研究结果表明:煤柱宽度为3、4、5、6、8、10 m时,未屈服破坏的煤柱宽度分别为0、0、1、2.6、4.8、7 m;煤柱较小时应力分布近似呈三角形,煤柱稍大后近似呈梯形分布;三角形分布是两侧垂直应力峰值叠加的结果,梯形分布是中部受较小采动和掘进影响引起的;煤柱向巷道内的位移随煤柱宽度的增加而增大,达到一定程度后再由大变小,最后趋于稳定;选择自身受力状况好的5 m煤柱,采取必要的加强支护措施可满足工程需要。
Aiming at the problem of narrow coal pillar width identified with large section roadway driving along next goal in fully mecha- nized caving face, the different widths of narrow coal pillar deformation and stress distribution were studied by using numerical test method in the paper, the reasonable narrow coal pillar width was determined and successfully applied to engineering practice. Some conclusions can be drawn as follows： when the width of coal pillar was 3 m, 4 m, 5 m, 6 m, 8 m and 10 m, the non -yield destruc- tion coal pillar width was 0 m, 0 m, 1 m, 2.6 m, 4.8 m and 7 m ; the stress distribution of narrower coal pillar is approximate triangu- lar, and the little bigger coal pillar is approximate trapezoidal distribution; the triangular distribution are overlapping resuhs of both sides vertical stress peak. The middle stress of trapezoidal distribution is lower, because of mining and tunneling influence smaller ; the displacement of the coal pillar to the roadway was increased with pillar width, then from big to small when it was up to a certain extent, finally tended to be stable ; the 5 m coal pillar was chosen as the pillar＇s better stress condition, and the necessary strengthen supporting measures can meet the needs of engineering.
出处
《煤矿安全》
CAS
北大核心
2014年第1期29-31,35,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51174142
51004075)
中国博士后科学基金资助项目(20110491631)
关键词
大断面
沿空掘巷
窄煤柱宽度
数值试验
变形破坏
受力分布
large section
roadway driving along next goaf
narrow coal pillar width
numerical testing
stress distribution
