郭屯煤矿回采工作面次生应力变化规律研究

Research on variation law of secondary stress on working face of Guotun Coal Mine

  • 摘要: 针对郭屯煤矿1304工作面巷道变形破坏现状,对该工作面次生应力进行实测:在该工作面巷道某处施工3个监测钻孔,在钻孔距工作面150 m处布置 4个HI传感器,分别监测不同位置岩体受采动影响所产生的次生应力变化。实测结果表明,超前支承压力峰值位于1304工作面前方约6.9 m处,应力集中系数约为2,为避开超前支承压力峰值,小煤柱尺寸应小于6.9 m;巷帮煤体承受的垂直应力较高,为56.7 MPa,巷道掘进中应及时进行支护,以提高小煤柱的承载能力。

     

    Abstract: For deformation and failure situation of roadway on 1304 working face of Guotun Coal Mine, the secondary stress of the working face was measured. Three monitoring drills were constructed at one point of the roadway on 1304 working face, and four HI sensors were set in the boreholes at 150 m away from the working face, which were used to monitor the secondary stress variation generated by rock mass at different positions influenced by mining. The field test results show that peak position of advancing abutment pressure is at about 6.9 m ahead of the working face, and stress concentration factor is about 2. In order to avoid the peak value of the advancing abutment pressure, the size of small coal pillar should be less than 6.9 m. Vertical stress of the laneway’s side is higher, which is 56.7 MPa. Therefore, the roadway should be timely supported to improve carrying capacity of the small coal pillar.

     

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