大埋深孤岛煤柱内巷道布置及支护技术研究

Study on roadway layout and support technique in deep isolated coal pillar

为解决大埋深孤岛煤柱内巷道的合理布置及围岩控制问题,基于某矿实际地质条件,探讨了煤柱塑性区宽度、煤柱应力分布和老空水3种影响巷道布置的主导因素。通过数值模拟对比分析了5种巷道布置方案的优缺点,给出最佳巷道位置及围岩控制方案,并进行工业试验。研究结果表明:孤岛煤柱内应力整体呈拱形分布,煤柱中央垂直应力最大,集中系数达到2.4,其中煤柱内7~10 m和19~22 m范围内垂直应力变化平缓;巷道布置的最佳位置是距下工作面采空区8 m;根据孤岛煤柱内巷道围岩的应力分布特点,现场采用巷道帮部非对称支护方案,监测表明巷道满足安全生产需求。

In oder to solve the problem of the reasonable layout of the roadway in the deep seams and the control of the surrounding rock,based on the actual geological conditions of a mine,width of coal pillar,distribution of coal pillar and water of old goaf are the three main factors influencing the layout of the roadway. The advantages and disadvantages of five roadway layout schemes are compared and analyzed by numerical simulation,and the optimum roadway location and surrounding rock control scheme are given,and industrial test is carried out. The results show that the internal stress of the isolated coal pillar is arch distributed,the central vertical stress of coal pillar is maximum,the concentration factor reaches 2. 4. The vertical stress in the range of 7 ~ 10 m and 19 ~ 22 m in the coal pillar changes gently. The optimal location of the roadway layout is from the working face goaf area 8m; according to the stress distribution characteristics of the surrounding rock in the pillar of the isolated coal pillar,the asymmetric support scheme of the roadway working slop is adopted in the field,and the surrounding rock monitoring shows that the roadway meets the safety production requirements.