大采高工作面煤壁片帮机理与防治技术研究

Research on mechanism and control of spalling on large mining height coal face

针对煤壁片帮已严重影响工作面安全回采等问题,以赵固二矿11050工作面为工程背景建立力学模型,将工作面简化为压杆受力并考虑护帮板对煤壁的支撑作用,分析得到减小采高、煤体弹性模量和增加支架支撑力能有效缓解工作面片帮。现场取样进行物理力学参数试验,得出煤层注水对煤体有软化作用,煤体弹性模量、坚固性系数均有所下降;通过数值模拟分析了"棕绳+注浆"技术能够较好地控制煤体,使煤体的自承能力和抗剪能力增加。现场采用煤层注水和"棕绳+注浆"相结合方法进行试验,达到了工作面安全正常回采的目的。

According to the serious problems of the rib spalling which had already affect the safety mining in the working face,based on project background of the 11050 working face of Zhaogu No. 2 Mine,the mechanical model was established to simplify the working face and supporting role of retaining plate to coal wall is considered. The results show that the reduction of the high,the elastic modulus of the coal body and the increasing support force of the supports can effectively relieve problems of the rib spalling; the test of the field samples obtained by the experiment of the test of physical mechanical parameters,which has a certain softening effect on the elastic modulus of coal body and the robustness coefficient; the coal wall can be controlled well by the ＂ palm rope ＋ grouting＂,the bearing capacity and shear capacity of coal was increased through the numerical simulation. At last,the combination with coal seam water injection and ＂ palm rope ＋ grouting＂ was tested in situ,which has achieved the purpose of safe and normal mining of working face.