摘要
在地质力学现场测试、岩石成分分析和井下可锚性试验的基础上,指出顶板砂岩含水、胶结性差,小煤柱侧煤体破碎严重、采空区积水渗漏,底板强膨胀是造成巷道破坏的主要原因;提出了自承拱、强化护表能力、全长高预应力锚固、支护系统相互匹配、锚固层位选择等支护理念,采用高预应力全长锚固锚杆和锚索成功支护了顶板砂岩含水"三软"破碎煤层小煤柱护巷巷道。在回采期间,巷道煤柱侧帮平均移近量为388.9mm,顶板下沉量最大为261mm,基本杜绝了巷道维修,工作面平均推进速度达到7.5m/d。
This paper indicated that hydrous sandstone roof, poor consolidation, cracked coal-body at small pillar side, gob hydrops and strong floor swelling were main factors which result in roadway failure on the basis of geological test, rock composition analysis and underground anchoring test. Some supporting ideas including self-loaded arch, strengthening surface supporting, full-length high pre- stress anchoring, supporting and protecting system matching and anchoring layer selection were put forward. Applying full-length ancho- ring bolt and cable successfully supported roadway under hydrous sandstone roof at small coal-pillar side in cracked coal-seam. During mining period, average sides＇ convergence was 388. 9mm and roof＇ s maximum subsidence was 261mm, roadway maintenance was al- most avoided, average mining speed reached 7.5m/d.
出处
《煤矿开采》
北大核心
2013年第1期43-46,共4页
Coal Mining Technology
基金
深部岩土力学与地下工程国家重点实验室2010年开放基金资助项目(SKLGDUEK1007)
关键词
三软煤层
小煤柱护巷
顶板砂岩含水
高预应力
全长锚固
soft coal-seam with soft rock and soft floor
small coal-pillar
hydrous sandstone roof
high pre-stress
full-length ancho- ring
