In response to prominent issues such as slow excavation speed and tight mining succession in the thick and soft coal seam of Liyuanhe Coal Mine,the main control factors affecting the excavation speed of the roadway were analyzed.By adopting the advanced support structure of the roof,the problem of long empty roof time in the soft roof during excavation has been solved.A cantilever tunne-ling machine slope type segmented coal cutting method was proposed to effectively prevent large-scale leakage caused by disturbance of the top coal during the coal cutting process.At the same time,the excavation and support construction technology has been optimized,a-dopting multi process cross parallel operations,greatly improving the efficiency of the excavation single cycle.Practice surface:the monthly average footage of the tunnel has increased from 69 m to 139 m,the excavation rate has increased by 102%,the maximum movement of the tunnel top and bottom plate is 160 mm,and the maximum movement of the two sides is 79 mm,meeting the needs of safety production.This study successfully solved the problem of roof leakage in thick and soft coal seam tunnels,and accumulated practi-cal experience for safe and rapid excavation of thick and soft coal seam tunnels.
关键词
特厚煤层/采掘接替/快速掘进/斜坡式分部割煤法
Key words
extra thick coal seam/mining and replacement/rapid excavation/slope type segmented coal cutting method
维普
万方数据