Large-span Roadway Bolt Anchor Combined Support Study

In recent years, along with economic development, the state's increasing demand for coal, in order to speed up the mine construction and strive to put into production, mine roadway and preparation of roadway along the seam over layout, roadway cross-section, mostly rectangular, as China's coal mining the continuous development of increasingly high degree of mechanization require roadway cross-section is also growing.Therefore, rectangular roadway support to become the new coal mines supporting one of the problems to be solved.As a result, studies of long-span roadway bolt anchor combined support technology, has a very important theoretical significance and value of engineering practice.This reference to the basis of extensive literature discusses the rectangular span roadway bolt and cable support mechanism, first determine the failure mechanism of large-span rectangular roadway damage given location, and analysis of anchor bolt, net, beam alone Mechanism and scope, given bolt and cable support mechanism, combined support design. According to bolt and cable support mechanism analysis, the use of structural mechanics theory of continuous beams, bolt and cable support given the design of methods of calculating bolt and cable support design formula. Bolting Coal span combined support of the design parameters, according to support design method, design parameters are given support. Commonly used in underground engineering finite element analysis software FLAC,on the numerical simulation support system analysis and calculation of surface coal interrupt the distribution of stress and deformation characteristics, demonstrate the feasibility of supporting programs and reliability of excavation sequence The effect of the support.This project relies on coal for the Huangling Mining Group II Cut 107 mechanized mining face trial applications, through theoretical analysis, numerical simulation and field test research, proposing a more comprehensive long-span roadway support theory and techniques, summarized briefly, practical and accurate calculation method of support parameters, in the long span of rectangular Bolt, network, combined support beams have been tested in practice. Huangling Coal Mining GroupⅡto support a new way opened up and made good economic and social benefits.