石拉乌素煤矿节理发育煤层回采巷道围岩变形规律及控制技术研究

发布时间：2018-03-09 10:54

本文选题：节理　切入点：大断面　出处：《中国矿业大学》2016年硕士论文　论文类型：学位论文

【摘要】：石拉乌素煤矿主采煤层埋深达到680m左右,2-2上201工作面是该矿井的首采面,工作面回风顺槽断面大(宽5m、高4m左右),围岩节理发育、整体强度低。因此本文基于石拉乌素煤矿东翼2-2上201工作面回风顺槽的地质条件,采用实验室实验、理论分析、数值模拟及现场实测相结合的方法,研究了石拉乌素煤矿节理发育大断面回采巷道围岩的变形规律,优化了相关支护参数,形成了有效的支护控制技术。得出以下主要结论:(1)理论分析了回采与节理对巷道围岩强度、塑性区及位移的影响规律并给出了理论计算公式。(2)采用UDEC数值模拟研究了节理角度对巷道围岩稳定性的影响规律,结果表明节理角度15°时塑性区、位移量最大。围岩深部位移沿节理方向剪切滑移,围岩表面发生拉伸破坏。(3)数值模拟表明结果表明,由掘进引起的巷道位移、应力较小。回采时,距工作面20m为巷道围岩变形剧烈区,20m-45m为巷道围岩变形缓慢区,45m外巷道围岩变形基本不受采动影响,最终巷道两帮变形量在350mm左右,顶板下沉量为250mm左右。(4)采用理论计算初步设计了石拉乌素煤矿节理发育煤层回采巷道的支护方案。并采用UDEC数值模拟优化确定了回风顺槽帮部锚杆间距为900mm、顶板间距为800mm,排距为900mm。(5)研究结果在现场进行了应用,并实测了应用效果,实测结果表明:掘进时巷道表面位移为十几毫米,巷道锚杆、锚索受力较小,回风顺槽围岩变形得到了有效的控制。
[Abstract]:Raoul stone in main coal mining coal seam buried depth is about 680m, 2-2 on the 201 working face of coal mine is the first mining face, face groove section (width 5m, height of about 4m), rock joint development, the overall strength is low. So the geological conditions in coal mine stone Raoul East Wing 2-2 on 201 the surface groove based on the laboratory experiment, theoretical analysis, numerical simulation and field measurement method of combining the study of deformation rule of stone Raoul in mine joint development of surrounding rock of large section roadway, optimize the related supporting parameters, the formation of effective support and control technology. The main conclusions are as follows: (1) theoretical analysis of the mining and joints on the surrounding rock strength, influence law of plastic zone and displacement and the calculation formulas are given. (2) effect of joint angle on the stability of surrounding rock is studied by UDEC numerical simulation results show that the joint angle. 15 degrees when the plastic zone, the maximum displacement. The deep displacement of surrounding rock along the shear direction of slip joints, the tensile failure of rock surface. (3) the numerical simulation results show that the roadway displacement by tunneling, less stress. When mining, 20m away from the face of intense deformation of roadway surrounding rock 20m-45m for the deformation of surrounding rock deformation is slow, basically not affected by mining 45m rock roadway, the final deformation of two sides of roadway roof subsidence at about 350mm, about 250mm. (4) the theoretical calculation of the preliminary design of the stone Raoul in mine joint development coal mining roadway supporting scheme. Simulation and optimization the groove part of the rock bolt spacing is 900mm by UDEC numerical, roof distance is 800mm, the row spacing was 900mm. (5) the results of the study in the field of application, and the actual application effect, the test results show that the excavation roadway surface displacement is 10 mm, The roadway bolt, the stress of the anchor cable is small, the deformation of the surrounding rock of the return wind is effectively controlled.

【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD353

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