磁西煤矿深部高应力巷道变形破坏机理及控制技术

Deep Highly Stressed Roadways in Cixi Coal Mine and the Control Technology

磁西煤矿-890 m进风行人大巷工程地质条件较差、水平构造应力大、自承能力低,现已发生严重变形破坏。为有效控制巷道围岩变形,保证其稳定性,通过对不同屈服准则条件下深部高应力巷道变形破坏进行弹塑性分析,确定适合工程实际的屈服准则,并基于FLAC3D结合巷道围岩岩性成分分析、力学性质测试结果,对不同支护方案中的支护结构、支护参数进行对比优化,提出以锚杆、锚索为核心的锚网索喷联合支护方案。在巷道开挖后进行矿压监测,进一步验证支护方案的可靠性,并获取巷道围岩开挖后的变化特征。工程实践表明,采用锚网索喷联合支护技术对提高深部高应力巷道整体性与稳定性具有较显著效果,围岩受力、变形更趋稳定,为保证煤矿的长期安全稳定提供了有力的技术支持。

The air inlet pedestrian roadway at -890 m of Cixi Coal Mine has occurred serious deformation and destructiondue to its poor engineering geological conditions, great horizontal tectonic stress and low self-supporting capacity. To controlsurrounding rocks deformation of the roadway and ensure its stability, the elastic-plastic analysis on deep high-stress roadwaydeformation and destruction under different yield criterion and conditions is carried out, and the yield criterion applicable to en-gineering practice is determined. Based on FLAC3D, combined with a lithological composition analysis and mechanical propertytest results of surrounding rocks, the supporting structures and parameters of different supporting schemes are contrasted andoptimized, and a combined supporting scheme of bolting and shotcreting is proposed ,with anchor bolts and cables as the core.Mine pressure after the excavation of roadways are monitored to verify the reliability of the supporting scheme further and obtainthe characteristics of surrounding rock change after excavation. Engineering practice shows that the combined supportingscheme of bolting and shotcreting has a significant effect on improving the stability and integrity of deep highly stressed road-ways, and makes the stress and deformation of surrounding rocks be more stable. It provides a strong technical support to ensurethe long-term security and stability of coal mines.