Research On Bolting Technology In Large Cross Section Coal Roadway

Nowadays, with the development of large mining caving face and top coal cavingtechnology in high technology, more and more roadways are excavated in coal seam, andmostly coal roadways are large section rectangle. Soft broken surrounding rock of large-section coal roadway, traditional theory is difficult to effective support and support their safe,which directly constrain the modernization of our country safety of high production and highefficient mine construction.This paper mainly focuses on large-section coal roadway bolting technology forresearch, including support for large-section coal roadway surrounding rock deformationfeature and mechanism of prestressed anchor Rod supporting theory and the supportingeffect. Using the advantages of numerical simulation software FLAC3D,which can researchmodel internal stress changes, and displacement changes and play plasticdeformation,first,Simulation of rock stress strain of changes features and law of excavationlarge section rectangle coal roadway,find rectangle coal lane rock deformation and damageof internal mechanism, and thus to identify and main object of coal roadway bolt rectangularretaining mechanism, but also to analyze the influence of roadway section size on and plasticarea of the rectangular roadway surrounding rock displacement.Second,using the numerical simulation and analysis of prestress diffusion of the highprestressed end anchorage of the anchor bolt in rectangle full of coal roadway, found that thedistribution of compressive stress mainly form in the anchor tail formation, rather than theends, and deduced the approximate relationship arch reinforcement thickness formed in theanchor tail formation with the bolt length.Finally, through the engineering analogy methodand theoretical calculation method has design calculation81309roadways in Baode mine,and then the numerical simulation of the anchor combined support scheme, in the drivingprocess and by a mining under the influence of the supporting effect, and the combinedeffect of the support scheme in the test in tunnel, analysis shows that the rationality of thesupporting scheme according to the dynamic information design method from the conception of the design process and to the practical application of the whole process,analysis shows that the mechanism of Baode section of rock bolt.