三软煤层沿空巷道破坏机制及锚注控制

发布时间：2018-09-16 21:21

【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。
[Abstract]:In view of the surrounding rock control problem of typical three soft strata along goaf roadway -4606 material roadway in Longkou coal mine, the deformation and failure mechanism of surrounding rock under the original support scheme is analyzed through field monitoring and test. The main reason of roadway deformation and failure is that the coal seam structure is complex, the surrounding rock is easy to expand, softens, the surrounding rock damage scope is large, the arch frame deformation damage is serious, and the bolting support potential can not be effectively brought into play. Taking bolting and grouting support as the core, two kinds of combined supporting test schemes are carried out, which are grouting anchor cable and grouting anchor cable in U-type shed. The results show that the deformation of surrounding rock of roadway is less than 37% of the original support scheme. The control effect of U-type shed on surrounding rock is not obvious. The combined support of grouting bolt and anchor cable can completely replace the traditional U-type shed support.
【作者单位】：山东大学岩土与结构工程研究中心;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;安徽理工大学煤矿安全高效开采省部共建教育部重点实验室;龙口煤电有限公司;
【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)
【分类号】：TD353

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