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大断面软岩巷道的支护问题是煤矿巷道支护的一个技术难题。在分析兴越煤矿回风大巷围岩岩性、地质条件及支护影响因素的基础上,通过现场实测、理论分析,确定巷道锚杆的支护参数;应用UDEC数值模拟软件,对不同锚杆支护参数条件下的巷道围岩变形、破坏情况进行分析,对巷道锚杆支护参数进行优化。确定选用锚杆直径22 mm、长度2.4 m,间排距800 mm×800 mm的支护方案是最优的。现场实践也表明,支护参数选取合理,支护效果较好。
Support of large section soft rock roadway is a technical problem of mine roadway support. Based on the analysis of the lithology, geological conditions and influencing factors of the surrounding rock of the return airway in Xingyue coal mine, the support parameters of the roadway bolt are determined by field measurement and theoretical analysis. The UDEC numerical simulation software is used to analyze the influence of different anchors Analysis of deformation and failure of surrounding rock under the conditions of rod support parameters is carried out to optimize the bolt support parameters of roadway. It is determined that the supporting scheme with the bolt diameter of 22 mm, the length of 2.4 m and the row spacing of 800 mm × 800 mm is the best choice. Field practice also shows that the selection of supporting parameters is reasonable and the supporting effect is good.