Bearing characteristics of anchor box beam support system in deep thick roof coal roadway and its application

Abstract

Considering the characteristics of deep thick top coal roadway, in which the high ground stress, coal seam with low strength, and a large range of surrounding rock fragmentation, the pressure relief anchor box beam support system with high strength is developed. The high-strength bearing characteristics and coupling yielding support mechanism of this support system are studied by the mechanical tests of composite members and the combined support system. The test results show that under the coupling effect of support members, the peak stress of the box-shaped support beam in the anchor box beam is reduced by 21.9%, and the average deformation is increased by 135.0%. The ultimate bending bearing capacity of the box-shaped support beam is 3.5 times that of traditional channel beam. The effective compressive stress zone applied by the high prestressed cable is expanded by 26.4%. On this basis, the field support comparison test by the anchor channel beam, the anchor I-shaped beam and the anchor box beam are carried out. Compared with those of the previous two, the surrounding rock convergence of the latter is decreased by 41.2% and 22.2%, respectively. The field test verifies the effectiveness of the anchor box beam support system.

Keywords

thick roof coal roadway / anchor box beam / bearing characteristics / combined support / field application

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