摘要
为研究深部巷道开挖引起的加卸荷现象及其诱发的围岩失稳,以埋深为1 275m的云南某矿山8^#矿体1261中段沿脉巷道为背景,采用FLAC^3D软件对巷道的应力场、位移场和塑性破坏区的演化规律进行模拟分析,探究开挖引起的加卸荷情况及其对巷道围岩稳定性的影响。结果表明:开挖结束后,巷道围岩应力重新调整,其帮部、斜底脚以及斜拱顶处加卸荷现象明显;随着开挖的进行,巷道斜底脚处围岩应力逐渐增加,而其余位置的围岩应力逐渐减少。8^#矿体有着中等至强烈岩爆倾向,主要危险区域为巷道折角处;巷道围岩位移量:拱顶>帮部>底板>斜拱肩>拱肩>斜底脚。
Aimed at the loading and unloading phenomena caused by deep roadway excavation and the surrounding rock instability induced by them,based on the tunnel along the vein in the middle section of 8^# orebody 1261 of a mine in Yunnan with a buried depth of 1 275 m,the influence of loading and unloading caused by excavation and its influence on stability of surrounding rock of roadway by FLAC^3D software analysis of the evolution law of stress field,displacement field and plastic failure zone of roadway.The results show that after excavation,the stress of surrounding rock of roadway is readjusted,and the loading and unloading phenomena are obvious at the side,the foot of inclined bottom and the top of inclined arch.With excavation,the stress of surrounding rock at the foot of inclined bottom of roadway increases gradually,while the stress of surrounding rock at other positions decreases gradually.The 8^# ore body has moderate to strong rockburst tendency;the main dangerous area is the corner of the roadway.Displacement of roadway surrounding rock:sidewall>vault>floor> oblique spandrel>spandrel>oblique foot.
作者
靳西传
周宗红
龙刚
侯廷凯
JIN Xichuan;ZHOU Zonghong;LONG Gang;HOU Tingkai(Faculty of Land Resources Engineering, Kunming University of Science and Technology,Kunming 650093,China;Guizhou Tongzi Coal Electrochemical Recycling Economy Industrial Park Management Service Center, Tongzi 563200,China)
出处
《中国矿业》
北大核心
2019年第6期104-110,共7页
China Mining Magazine
基金
国家自然科学基金项目资助(编号:51864023
51264018
51064012)
关键词
深部巷道
开挖模拟
FLAC^3D软件
岩爆倾向
演化分析
deep roadway
simulation of excavation
FLAC^3D software
rockburst tendency
evaluation analysis
