薄弱泥岩顶板厚煤层马头门围岩失稳分析及加固技术

发布时间：2018-02-25 09:22

本文关键词： 薄弱泥岩顶板厚煤层马头门失稳围岩控制注浆加固　出处：《煤炭科学技术》2017年08期 　论文类型：期刊论文

【摘要】：为解决漳村煤矿薄弱泥岩顶板厚煤层大断面马头门失稳问题,采用钻孔窥视仪对围岩深部破坏情况进行成像观察,分析了马头门破坏原因,并采用FLAC~(3D)软件模拟了围岩失稳破坏过程,研究了其破坏机理,在此基础上提出了加固方案,即先压注水泥基无机材料,充填围岩中的张开裂缝,再补注聚氨酯型高分子化学有机材料,密实围岩微小裂隙,最后对围岩周边施以预应力全长锚固强力锚索支护。结果表明:前后2次分别采用2种材料高压注浆,能够大范围充填岩体裂隙,较好地恢复破碎围岩的完整结构,大幅度提高加固效果,而锚索支护相当于对围岩周边施加了强力的边界条件,使其具有较强的主动抵抗再次变形能力。2种措施配合使用,解决了厚煤层薄弱泥岩顶板条件下破碎马头门的修复难题。
[Abstract]:In order to solve the problem of Weak Mudstone in Zhangcun coal mine large section coal seam door horsehead instability problem of imaging observation of deep surrounding rock damage by borehole instrument, analyzes the ingate damage causes, and the use of FLAC~ (3D) software to simulate the rock failure process, the failure mechanism is studied, based on this the reinforcement scheme, namely pressure injection of cement based inorganic materials, rock filling in the crack opening, then recharge polyurethane chemical organic materials, compacting rock micro cracks, finally the surrounding rock with prestressed anchor anchoring strength. The results show that 2 times before and after respectively using 2 kinds of materials of high pressure grouting, can the scope of filling in fractured rock, broken rock complete structure recovery better, improve the reinforcement effect greatly, and the anchor is equivalent to the surrounding rock strength applied boundary conditions, which has Strong active resistance to re deformation capacity.2 measures combined with the use of the weak mudstone under the roof of the thick coal seam to solve the problem of the repair of the horse head door.

【作者单位】：山西潞安环保能源开发股份公司漳村煤矿;
【基金】：山西省煤基重点科技攻关资助项目(MJ2014-03)
【分类号】：TD264.2

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