CAJ | 학술논문

以酸刺沟煤矿6上特厚煤层大采高综放回采巷道支护为工程背景,基于井下地质力学实测结果,采用数值模拟方法,对比分析了酸刺沟煤矿6上煤层不同煤柱宽度和不同巷道断面尺寸下煤岩体的受力、变形及破坏特征。研究结果表明：6上煤层顶板结构较为单一,以粗砂岩为主,不同位置强度不同,大多在40~80MPa之间,巷帮煤体平均抗压强度为19．80MPa,所测测站中最大水平主应力为7．94MPa,总体处于较低的应力水平；煤柱宽度由15m增加到20m时,巷道变形减小最为显著；煤柱宽度由25m增大到30m时,巷道变形减小趋势变得不明显；巷道掘进与工作面回采阶段巷道围岩应力随宽度增加的变化趋势相同,随着巷道宽度的增加,巷帮垂直应力呈线性增加,巷道顶板的水平应力呈线性减小。基于上述结论,对酸刺沟煤矿6上煤层1109胶运巷进行了支护设计与井下试验,工作面回采后巷道断面收缩率小于15%,实现了特厚顶煤大断面强采动围岩变形的有效控制。
이산자구매광6상특후매층대채고종방회채항도지호위공정배경,기우정하지질역학실측결과,채용수치모의방법,대비분석료산자구매광6상매층불동매주관도화불동항도단면척촌하매암체적수력、변형급파배특정。연구결과표명：6상매층정판결구교위단일,이조사암위주,불동위치강도불동,대다재40~80MPa지간,항방매체평균항압강도위19．80MPa,소측측참중최대수평주응력위7．94MPa,총체처우교저적응력수평；매주관도유15m증가도20m시,항도변형감소최위현저；매주관도유25m증대도30m시,항도변형감소추세변득불명현；항도굴진여공작면회채계단항도위암응력수관도증가적변화추세상동,수착항도관도적증가,항방수직응력정선성증가,항도정판적수평응력정선성감소。기우상술결론,대산자구매광6상매층1109효운항진행료지호설계여정하시험,공작면회채후항도단면수축솔소우15%,실현료특후정매대단면강채동위암변형적유효공제。
Applying numerical simulation, stress, deformation and failure characteristic of surrounding rock under different coal-pillar widths and section sizes was comparably analyzed on the basis of underground geological and mechanics test result from 6-upper coalseam of Suancigou Colliery. Result showed that roof structure of 6-upper coalseam was simple and dominated by coarse sandstone, its strength varied within 40 ~80MPa, average compression strength of two-side coal was 19. 8MPa, measured maximum horizontal principal stress was 7. 94MPa which was in lower stress level. When coal-pillar width increased from 15m to 20m, roadway deformation reduction was obvious; When it increased from 25m to 30m, deformation reduction tendency was noteless. In roadway driving and face mining, the tendency of surrounding rock stress increasing with coal-pillar width was the same. With roadway width increasing, vertical stress linearly rose, and horizontal stress linearly reduced. On the basis of the results, supporting design of 1109 transportation roadway in 6-upper coal-seam was made, underground test showed that roadway convergence ratio was minor than 15%. Surrounding rock de-formation influenced by strong mining in extremely-thick coalseam was controlled effectively.