深井高应力破碎区巷道破坏机理及控制研究

Failure Mechanism and Control Measures of Roadway in High Stress and Broken Area at a Great Depth

为了解决深井、高应力和破碎区巷道维护问题,针对薛湖矿-780 m大巷复杂工程地质状况,研究了大巷围岩特征及破坏因素,依据围岩破坏和受力特征,建立力学模型,探讨破坏机理,提出大巷的控制原则和控制技术,采用UDEC软件模拟优化不同控制方案,确定新支护方案及合理的支护参数,进行井下工业性试验,利用矿压观测和拍摄围岩内部状况检验新方案的有效性.研究结果表明:巷帮中存在圆弧状"滑动面",控制巷道的关键是确定巷帮稳定区临界高度,控制"滑动面"稳定,实施新设计方案后,-780 m大巷变形得到了有效控制.

To solve the problem of roadway maintenance in a high stress and broken area at a great depth, according to the complex engineering geological conditions in Xuehu Mine -780 m main roadway, we studied the characteristics and failure factors of main roadway surrounding rocks and established the mechanical model, probed into the failure mechanism, and proposed some control measures and technologies. In addition, we simulated and optimized different con- trol schemes by using the UDEC software to determine some new technological parameters for industrial test. By using the observation data and photos, the validity of this new scheme was verified. The results show that there is an ＂arc-shaped sliding surface＂ in the roadway sides, the key of controlling roadway is to determine the critical height of stable area so as to make the ＂arc-shaped sliding surface＂ a stable one. After the new scheme has been implemented, the - 780 m roadway deformation has been effectively controlled.