掘进巷道围岩变形监测与数值模拟研究

Monitoring and Numerical Simulation of Enclosed Rock Deformation in Tunneling Roadway

为探究掘进巷道推进全过程中不同深度测点处围岩变形量,以石港煤矿15210掘进工作面为背景,采用现场实测与数值模拟方法,研究了传统滞后监测与全过程监测巷道位移的差别。研究结果表明:掘进面推进过程中,巷道浅部围岩变形量相较于深部更加显著,0.3 m深测点的最大累计位移量为15.8 mm,最大位移增长速率为2.6 mm/d,均显著大于深部。巷道浅部围岩和深部围岩实测数据得到的变形规律相同,浅部围岩经历了缓慢增长、迅速增加、趋于稳定3个阶段,而在滞后掘进面一定距离时深部围岩位移曲线出现平台期。数值模拟结论与现场实测结论相同,掘进过程中巷道壁相较于深部岩石破坏严重,最大变形量为14~16 mm。

In order to investigate the deformation of surrounding rock at different depth measurement points during the whole process of roadway advancement,the difference between the traditional hysteresis monitoring and the whole process of roadway displacement monitoring was investigated with the background of 15210 roadway face of Shigang Mine,using on-site measurement and numerical simulation methods.The results show that the deformation of the shallow peripheral rock in the roadway is more significant than that in the deep part during the advancement of the roadway,and the maximum cumulative displacement of the 0.3 m deep measuring point is 15.8 mm,and the maximum displacement growth rate is 2.6 mm/d,which is significantly larger than that in the deep part.The deformation patterns obtained from the measured data of the shallow and deep peripheral rocks of the roadway are the same,the shallow peripheral rocks experienced three stages of slow growth,rapid increase and stabilisation,while the displacement curve of the deep peripheral rocks appeared a platform period when lagging behind the digging face by a certain distance.The conclusion of numerical simulation is the same as the conclusion of field measurement,the tunnel wall in the process of digging is seriously damaged compared with the deep rock,and the maximum deformation is 14~16mm.