高地应力巷道组合托梁支护技术

摘要

Based on high support difficult problems of mining gateway in high stress and large cross section coal mining face of Xinjing Mine,the combined joist support technology was applied to the gateway of No.7204 coal mining face in No.2 block of Lu'nan No.3 seam. Based on an analysis on the structure features of the combined joist,parameters of a steel band were designed,the performances and sup-port capacity of the flower bowl steel band in the support pressure loading were simulated and analyzed and an analysis was conducted on the support effect.The results showed that the support pressure loading performances of the bowls and dishes type steel band were excellent and with the articulated connection method of the bolt and anchor,the steel band could form a combined plate and bracket structure. The bowls and dishes type steel band would be simple and convenient in site construction,the deformation value of the supported surrounding rock was obviously less than the conventional steel band support and the cross section convergence of the gateway could be controlled in less than 12%. There was no obvious difference in the load variation of the bolt and anchor and the high support difficult problems of the mining gateway in the high stress and large cross section coal mining face were effectively solved.%基于新景煤矿高应力大断面回采巷道支护难度大的问题，在芦南3号煤层二区7204工作面巷道采用组合托梁支护技术，在分析组合托梁结构特征的基础上，设计了组合托梁的钢带参数，模拟分析支护承压中的花碗型钢带的性能及支护能力，并对支护效果进行分析。结果表明：碟碗型钢带承压性能优越，与锚杆锚索的铰接连接方式形成组合托板托梁结构；碟碗型钢带现场施工简单便捷，支护围岩变形量明显小于传统钢带支护，将巷道断面收缩率控制在12%以内，且锚杆锚索荷载变化无明显差异，有效解决了高应力大断面回采巷道支护难度大的问题。