Corrugated steel web support technology in roadways at Baijigou Coal Mine
To address the insufficient support capacity of I-beam for mining in southern wing district roadways at Baijigou Coal Mine,steel support with corrugated webs is proposed.The bearing capacity of corrugated steel web and traditional I-beam support were analyzed using standardized formulas.Additionally,the out-plane stability performance of corrugated steel web was investigated using the finite element method.The design of overlapping joints for the corrugated steel beams and legs were developed,followed by on-site monitoring tests of the support system.The results show that,when steel quantities are similar to those of No.11 I-beam,the bearing capacity of the corrugated steel beams and legs increases by 74.3% and 50%,respectively,compared to I-beam,and deformation reduces by 78.3% .The placement of three longitudinal tie rods at both ends and the middle of the beams and legs is found to enhance the out-of-plane stability of the support.On the premise of meeting support strength requirements,the deformation at the middle of the corrugated steel beams decreases by an average of approximately 54.5% compared to I-beam for mining,and leg convergence reduces by around 84% on average.The support effect of steel support with corrugated webs is 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 alleviates underground labor intensity but also ensures the continuous production of the on-site working face.
support with corrugated steel websI-beam for miningconvergence of roadwayconnection configurationroadway support
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