波形钢腹板支架技术在白芨沟煤矿巷道支护中的应用

Corrugated steel web support technology in roadways at Baijigou Coal Mine

为了解决白芨沟煤矿南翼采区巷道矿用工字钢支架支护能力不足的技术难题,提出采用一种新型波形钢腹板支架技术。通过规范公式计算分析了波形钢腹板支架和传统矿用工字钢支架的承载力,并采用有限元方法探究了波形钢腹板支架的面外稳定性能,设计出波形钢腹板棚梁和棚腿的搭接节点构造方式,开展了支架的现场监测试验。结果表明:用钢量与11#矿用工字钢相近时,波形钢腹板支架的棚梁和棚腿承载力分别比前者提高了74.3%和50%,变形减小78.3%。在支架棚梁和棚腿的两端和跨中各设置3个纵向系杆时有利于支架的面外稳定性。在满足支护强度的前提下,波形钢腹板棚梁跨中变形比矿用工字钢棚梁平均减少54.5%左右,棚腿收敛量平均减少84%左右。波形钢腹板支架支护效果显著优于矿用工字钢,同时由于采用了单棚置换原来的对棚支护方式,减轻了井下劳动强度,保证了现场工作面的接续生产。

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.