Research On Bolt Mechanical Characteristics Experiment And Support Applications Of Mining Roadway

With the wide application of the technology such as oversized mining height full thickness in one time and rapid tunneling of coal roadway,a batch of tons of coal mines and working faces have emerged,which has driven the development of mining equipment towards the direction of heavy-duty and large-scale.If the high efficiency mining of working face is realized,it is necessary to have high stability and safety in the roadway of working face.The increasing mining intensity and the section size of roadway not only increase the difficulty of the effective control of roadway roof.The reliability and systematization of bolt support technology are also required.In this paper,the author takes the first 8.0m large mining height coal face as the research object to study the mining roadway of 12511 working face in high yield and high efficiency mine,and studies the mechanical characteristics of bolt and the application of bolt support technology in high yield and high efficiency mine.Dissertation applies the methods of field investigation,theoretical analysis,numerical simulation,laboratory experiment and field monitoring.It reveals the influence of the regional tectonic geological environment and the characteristics of in-situ stress field on the stability of the mining roadway,constructs the fuzzy evaluation matrix equation by using the mathematical method of analytic hierarchy process and fuzzy evaluation,and evaluates the roadway geology and mechanics.It provides the foundation for the design of bolting support.Based on the thick wall theory in elastic mechanics,the calculation formula of sleeve wall thickness under different surrounding rock strength characteristics is solved.The requirements of three diameter matching and the influence of different eccentricity scales on the installation process of anchor rod in Shendong mining area are expounded,and the requirements of reasonable drilling construction and installation technology of anchor rod are determined.For the first time,FBG sensing technology has been applied in Shendong Mining area for the first time to complete the research and development of the fiber anchor rod and the field installation test.The dynamic distribution law and evolution characteristics of the axial force of the anchor rod under different anchoring modes have been revealed.To provide support for optimal design of support scheme.The distribution and evolution characteristics of the axial force of the bolt under different anchoring modes are determined,which provides support for the optimum design of the supporting scheme.By using the software of FLAC3D numerical simulation,the optimization scheme of different bolt spacing is numerically simulated,and the variation law of surrounding rock stress and displacement of different supporting schemes is analyzed.Finally,the bolting support scheme suitable for mining roadway in Bulianta Mine is determined.Dissertation starts from many aspects,such as geomechanical evaluation,bolt support material,installation technology,anchoring method and support parameter design.A set of supporting mode suitable for mining roadway with high yield and high efficiency is formed.Research results have important guiding significance for setting up a set of supporting mode suitable for high yield and high efficiency mining roadway in coal mine,which ensures the safe mining of ten million tons of coal face,and will be applied in 12515 face of Bulianta Coal Mine.In the dissertation there are 118 figures,38 tables,122 references.