含夹矸富水特厚煤层煤巷围岩控制技术研究

发布时间：2018-02-16 00:03

本文关键词： 特厚煤层裂隙水数值模拟支护方案围岩控制优化方案　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：本课题以内蒙古唐家会煤矿61101综放工作面两巷研究为背景,针对含夹矸富水特厚煤层煤巷的围岩控制及支护技术进行研究。水对岩石强度有很大的影响,岩石遇水软化变形,从而导致岩石强度降低,锚杆锚索锚固力降低,甚至造成煤岩石巷道的崩塌,出现安全隐患以及造成安全事故。为了防止围岩巷道发生变形坍塌,采用理论分析、数值模拟、现场监测等方法对原支护方案进一步研究。最终得出了如下结论:介绍了特厚煤层煤巷围岩特征以及煤巷布置方式,煤巷围岩遇水软化时软化系数的确定。通过理论分析,运用岩石破坏准则(库伦-纳维尔破坏准则)确定应力圆与抗剪强度直线的关系,还得出了最大主应力与最小主应力的关系式;建立煤层巷道顶板、底板梁的受力分析图,分析影响顶板、底板破坏的因素,通过理论分析计算得出顶板、底板梁破坏时的最大挠度、转角以及最大主应力的关系式,确定了最大挠度及最大主应力出现在顶板、底板梁的中部,最大转角出现在顶板和底板梁的两端;对顶板梁的稳定性进行分析,通过力学模型得出保持岩块稳定性的力学关系式,得出了岩块水平推力和拱角竖向力的关系,巷道的跨度增大会导致水平推力以及拱角竖向力都增大,增加到一定程度岩块就会发生滑落。利用物理实验的方法对遇水的岩石试样进行岩性分析,运用FLAC3D数值模拟软件对煤巷原始支护方案进行分析,模拟的原始效果不理想,需要对原始支护方案进行参数优化。本文提出了四种优化方案措施,分别是针对不同巷道断面形状、锚杆锚索的参数进行优化,将四种优化方案通过数值模拟对比分析,最终得到平顶微拱形断面的一个优化方案比较合理。将理论应用于现场实践,通过对围岩顶底板以及两帮的位移移近量、顶板与两帮的锚杆索锚固力大小的监测,确定优化方案是比较合理的。本论文得出了以上研究成果,为以后相似地质条件的围岩支护提供了一定的理论依据。
[Abstract]:Based on the study of two roadways in 61101 fully mechanized caving face of Tangjiahui Coal Mine in Inner Mongolia, this paper studies the surrounding rock control and supporting technology of coal roadway with rich water and thick coal seam containing gangue. The water has a great influence on the rock strength, and the rock softens and deforms with water. Therefore, the strength of rock and the anchoring force of anchor cable are reduced, and even the collapse of coal and rock roadway, the hidden danger of safety and the safety accident are caused. In order to prevent the surrounding rock roadway from collapsing, theoretical analysis and numerical simulation are used. Field monitoring and other methods are used to further study the original support scheme. Finally, the following conclusions are drawn: the characteristics of surrounding rock and the layout of coal roadway are introduced, and the softening coefficient of surrounding rock in coal roadway is determined when the wall rock of coal roadway is softened by water. The relationship between the stress circle and the shear strength straight line is determined by using the rock failure criterion (Coulom-#internal_person0# failure criterion), and the relationship between the maximum principal stress and the minimum principal stress is obtained. By analyzing the factors affecting the failure of the roof and floor, the relationship between the maximum deflection, the angle of rotation and the maximum principal stress of the roof and beam is obtained by theoretical analysis and calculation, and the maximum deflection and the maximum principal stress appear in the roof, and the relationship between the maximum deflection and the maximum principal stress is determined. In the middle of the bottom beam, the maximum angle appears at the two ends of the roof beam and the bottom beam, the stability of the roof beam is analyzed, and the mechanical relationship to maintain the stability of the rock block is obtained by the mechanical model. The relation between horizontal thrust of rock block and vertical force of arch angle is obtained. The increase of span of roadway will result in the increase of horizontal thrust and vertical force of arch angle. If the rock mass is increased to a certain extent, the rock mass will slip. The original effect of the simulation is not satisfactory, the lithology of the rock sample in water is analyzed by physical experiment method, and the original support scheme of coal roadway is analyzed by FLAC3D numerical simulation software. It is necessary to optimize the parameters of the original support scheme. In this paper, four kinds of optimization methods are put forward, which are based on different roadway section shape and the parameters of anchor cable, and the four optimization schemes are compared and analyzed by numerical simulation. Finally, an optimization scheme of flat-roof micro-arch section is obtained. The theory is applied to the field practice. By monitoring the displacement of surrounding rock roof and bottom slab and two sides, the anchor force of roof and anchor cable is monitored. It is reasonable to determine the optimization scheme. The above research results are obtained in this paper, which provides a certain theoretical basis for the surrounding rock support with similar geological conditions in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

【参考文献】