厚煤层刀柱采空区集中应力影响范围理论判据研究  

Theoretical criterion of concentrated stress influence scope with thick coal seam left-over goaf

作　　者：屠洪盛[1,2] 屠世浩[1,2] 袁永[1,2] 王方田[1,2] 王沉[1,2] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221008 [2]中国矿业大学深部煤炭资源开采教育部重点实验室,江苏徐州221008

出　　处：《煤炭学报》2013年第8期1345-1351,共7页Journal of China Coal Society

基　　金：江苏省高校优势学科建设工程资助项目(SZBF2011-6-B35);江苏省研究生培养创新工程资助项目(CXZZ12_0950)

摘　　要：针对资源整合矿井厚煤层刀柱采空区煤岩应力集中问题，结合刀柱工作面开采方式和煤岩地质赋存条件，利用弹塑性力学半平面体理论和刀柱采空区煤岩受力特点，建立了刀柱工作面煤岩体力学模型，推导出刀柱采空区应力分布计算公式，并对单个和多个刀柱时应力分布规律、影响范围以及主要影响因素进行了对比研究，得出多个刀柱叠加作用下集中应力影响范围是单个刀柱影响范围的2．5～3．0倍，随刀柱数量的增加，竖直方向影响范围的增加速率逐渐减小，当刀柱数量达到20个时应力影响范围趋于稳定；水平方向影响范围受刀柱数量影响较小，确定了以竖直应力的影响范围作为判断刀柱影响范围的依据。结合杨涧煤矿刀柱工作面开采实际，计算得出刀柱采空区在竖直方向的影响范围为10．6m，会对9号煤层复采工作面的回采造成影响，并提出了复采工作面合理设计原则和刀柱应力释放措施。In terms of the stress concentration problems at pillar support goal in thick coal seam, combining with recov- ery method and geological conditions at pillar support face, using mechanics theory and stress characteristics of pillar support goaf, this study established a mechanical model and derived stress calculation formula. In addition, a comparative analysis on stress distribution law, influence scope and the main influence factors of single left-over pillar and multiple left-over pillars was conducted to obtain the concentrated stress influence scope of single left-over pillar, which is 2.5-3.0 times larger than that of multiple left-over pillars. The increase rate of influence scope in vertical direction gradually reduces with the increase of the number of left-over pillars. The influence range tends to be stable when the number of left-over pillar reaches 20. The influence range at horizontal direction has less variation with the number of left-over pillars changes. Therefore, the influence range of vertical stress is determined as the criteria for assessing left- over pillars stress influence range. In a case study at Yangjian mine, combined with mining practices at left-over goal working face, the influence range is calculated as 10.6 m in vertical direction, which will cause impact on the repeated mining face at No. 9 seam. Also, the rational design principles and left-over goal stress release measures are proposed for the repeated mining face.

关 键 词：刀柱采空区 应力分布 应力影响范围 复采 采出率 

分 类 号：TD823.5[矿业工程—煤矿开采]