关键词: 波形钢腹板支架, 矿用工字钢, 巷道收敛量, 节点构造, 巷道支护

Abstract: To address the technical challenge of insufficient support capacity of I-beam for mining in the roadway of the southern wing excavation area of Baijigou Coal Mine, a novel technology of steel support with corrugated webs is proposed. Comparative calculations of load-bearing capacity were conducted using standardized formulas for the two types of supports. Additionally, the out-of-plane stability performance of steel support with corrugated webs was investigated using the finite element method. The design of overlapping joints for the corrugated steel beams and legs was developed, followed by on-site monitoring tests of the support system. The findings reveal that, with steel quantities similar to those of No. 11 I-beam for mining, the load-bearing capacity of the corrugated steel beams and legs increased by 74.3% and 50%, respectively, compared to the former, and deformation reduced by 78.3%. The placement of three longitudinal tie rods at both ends and the middle of the beams and legs was found to enhance the out-of-plane stability of the support. Under the premise of satisfying support strength requirements, the deformation at the middle of the corrugated steel beams decreased by an average of approximately 54.5% compared to I-beam for mining, and leg convergence reduced by an average of around 84%. The support effect of the steel support with corrugated webs proved significantly superior to that of I-beam for mining. Furthermore, the adoption of a single-shed replacement for the original cross-shed support method not only decreased labor intensity underground but also ensured the continuous production of the on-site working face.