石拉乌素煤矿穿层大巷非均匀变形规律及控制技术研究

发布时间：2018-02-26 07:18

本文关键词： 穿层巷道非均匀变形规律控制技术回风大巷　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文基于石拉乌素煤矿穿层巷道—回风大巷的工程地质条件,采用岩石力学实验、理论分析、数值模拟及现场实测相结合的方法,研究了穿层巷道围岩非均匀变形规律,优化了相关支护参数,形成了有效的支护控制技术。首先,通过现场岩石取样,进行了岩样的物理力学性能参数测试,结果表明,巷道围岩整体强度较低,属于易破碎的软岩。其次,在力学测试实验的基础上,运用UDEC软件模拟了不同层位、不同煤厚、不同煤层节理倾角穿层巷道围岩的非均匀变形规律,研究表明,巷道由岩层穿层进入煤层,围岩塑性区范围及顶底板变形量分别增大了2m、190mm;巷道穿层时,围岩的均质性对巷道变形具有很大影响。随着煤层厚度的增加及围岩均质性的减弱,围岩塑性区范围和变形不再呈对称分布,且大巷穿层过程中巷道右帮变形大于左帮,顶板变形与底板底鼓随煤层厚度的增大其差值逐渐变大;随煤层节理角度增大巷道两帮移近量不断增大,当节理面倾角θ40°时,顶底板移近量随θ增大而增大,而节理面倾角θ40°时,顶底板收敛量随θ增大而减小。再次,根据穿层大巷围岩变形规律,对穿层巷道围岩支护方式及参数进行了模拟优化研究,最终确定采用锚网索喷+U型支架联合支护方案,可有效地控制穿层大巷围岩的变形破坏。最后,通过现场工程实践对穿层大巷围岩变形规律进行了观测,观测表明,石拉乌素煤矿回风大巷右帮及肩角围岩受力及变形比左帮和顶板大,大巷进入2-2上煤层后,巷道两帮片帮及顶板变形较穿层前严重,但总体上围岩控制效果较好。
[Abstract]:In this paper, based on the engineering geological conditions of the tunneling roadway and return wind roadway in Shilawusu Coal Mine, the non-uniform deformation law of the surrounding rock in the roadway through the strata is studied by the methods of rock mechanics experiment, theoretical analysis, numerical simulation and field measurement. The related support parameters are optimized and effective support control technology is formed. Firstly, the physical and mechanical properties of rock samples are tested by rock sampling in situ. The results show that the overall strength of roadway surrounding rock is low. Secondly, on the basis of mechanical test experiment, UDEC software is used to simulate the non-uniform deformation law of roadway surrounding rock with different seam seam inclination angle, different coal thickness and different seam seam. The range of plastic zone of surrounding rock and the deformation of roof and floor are increased by 2mm ~ 190mm respectively, the homogeneity of surrounding rock has a great influence on the deformation of roadway, with the increase of coal seam thickness and the weakening of surrounding rock homogeneity, the roadway enters the coal seam from the stratum through the strata, and the deformation of the roof and floor increases respectively. The range and deformation of the plastic zone of surrounding rock are no longer symmetrical distribution, and the deformation of the right side of roadway is larger than that of the left side in the process of roadway crossing, and the difference between roof deformation and floor heave becomes larger with the increase of coal seam thickness. With the increase of joint angle in coal seam, the two sides of roadway are moving closer. When the angle of inclination of joint surface is 40 掳, the distance of roof and bottom plate increases with the increase of 胃, and the convergence of roof and floor decreases with the increase of 胃 when the angle of inclination of joint plane is 40 掳. Again, when the angle of joint is 40 掳, the convergence of roof and floor decreases with the increase of 胃. According to the deformation law of surrounding rock in roadway, the supporting mode and parameters of tunnel surrounding rock are simulated and optimized, and the combined support scheme of U-type support with anchor, mesh, cable and shotcrete is finally determined. The deformation and failure of surrounding rock in tunnel can be effectively controlled. Finally, through field engineering practice, the deformation law of surrounding rock in tunnel is observed, and the observation shows that, The stress and deformation of the surrounding rock of the right side and the shoulder corner of the return wind main roadway in Shilawusu Coal Mine are larger than that of the left side and the roof. After the roadway enters the 2-2 upper coal seam, the deformation of the two sides of the roadway and the roof is more serious than that of the former, but the control effect of the surrounding rock is better on the whole.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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