摘要
针对龙口矿区梁家煤矿典型三软地层沿空巷道-4606材料巷围岩控制难题,通过现场监测和试验,分析原支护方案下围岩变形破坏机制。煤层结构复杂,围岩易膨胀、软化,围岩破坏范围大,拱架变形破坏严重,锚杆支护潜力无法有效发挥是巷道变形破坏的主要原因。以锚注支护为核心,实施了U型棚+注浆锚杆+注浆锚索和注浆锚杆+注浆锚索2种联合支护对比试验方案。结果表明:方案实施后,巷道围岩变形量均小于原支护方案37%以上,U型棚+注浆锚杆+注浆锚索联合支护方案中U型棚对围岩的控制作用不明显,注浆锚杆+注浆锚索联合支护完全可以取代传统的U型棚支护。
According to the field investigation and experiments on a typical gob side entry-material roadway of workingface 4606 in Liangjia Coal Mine,the failure mechanism of surrounding rock under original supporting plan was ana-lyzed. The complex structure of coal seam,the easy expansion and softening of surrounding rock,large destructionscope,serious arch deformation,and ineffective support were the main causes of roadway failure. Taken bolt-groutingsupport as a core measure,two supporting test schemes,namely U type shed＋grouting bolt＋grouting cable and groutingbolt＋grouting cable,were proposed. The results show that the surrounding rock deformations are less than 37% com-pared with original supporting plan. U type shed does not play an obvious role in controlling surrounding rock,there-fore,the grouting bolt ＋ grouting cable can replace U-type shed.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2016年第5期1111-1119,共9页
Journal of China Coal Society
基金
国家自然科学基金资助项目(51304125)
中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1519)
煤矿安全高效开采省部共建教育部重点实验室开放基金资助项目(JYBSYS2014103)
关键词
三软煤层
沿空巷道
破坏机制
锚注试验
three soft coal seam
gob side entry
failure mechanism
bolt-grouting test
