近断层深部巷道变形破坏分析及支护研究

针对某铜矿回采深部矿体过程中多次发生较大规模地压活动,造成多处巷道不同程度出现片帮、局部垮塌、冒落等灾害现象,运用FL AC3D软件对十七中段1709、1711巷道在不同支护情况下应力分布及变形破坏进行了模拟分析.结果显示:矿体崩落回采会对断层造成极大的影响,且巷道距离断层越近破坏越严重;在巷道支护前后,应力由两帮逐渐...

Deformation and failure analysis and support research of deep roadway near fault

Aiming at the large-scale ground pressure activities occurred many times in the process of mining deep ore body in a copper mine, which caused various roadways to appear fragments, partial collapses, and other disasters, the Flac3D software was used to simulate and analyze the stress distribution and deformation and failure of the 1709 and 1711 roadways in the seventeenth middle section under different supporting conditions. The results showed that the ore body caving and mining will have a great impact on the fault, and the closer the roadway was to the fault, the more serious the damage; before and after the roadway support, the stress was gradually transferred from the two sides to the arch of the roadway; simulation analysis of the support planwas being carried out at the time, it was found that the support effect of the bolt-net-spraying support was better than that of the U-shaped steel support. When the bolt-net-spraying (anchor rod 2.4 m) was optimized for strengthening support, the maximum stress values of the 1709 roadway and the 1711 roadway were 28 MPa and 23.75 MPa respectively, the impact range was 0.8 m and 3.6 m respectively, and the roadway deformation and displacement were small, which can meet the basic requirements of ore body mining.