矩形巷道开挖对围岩稳定性的影响分析  

Analysis of the Influence of Rectangular Tunnel Excavation on the Stability of Surrounding Rock

作　　者：张辛棋 Zhang Xinqi(Zhongzheng Mining Construction Group Co.,Ltd.,Xi'an Shaanxi 710000,China)

机构地区：[1]中钲矿山建设集团有限公司,陕西西安710000

出　　处：《山西冶金》2024年第9期138-140,共3页Shanxi Metallurgy

摘　　要：为研究矩形巷道开挖对围岩的稳定性影响,依托木瓜煤矿实际资料,采用FLAC3D建立数值计算模型开展不同侧压系数对矩形巷道围岩稳定性的影响研究。结果表明:随着开挖深度的增大,顶板和底板主应力差呈现先增大后趋于稳定的规律,而两帮处的主应力差的增大速率呈现先缓慢后快速增大最后保持稳定的规律;开挖对距工作面0~5 m范围内的围岩影响最大,也最容易出现塑性区,随着开挖深度的增大,巷道围岩出现不同程度的剪切破坏,顶板和底板出现不同程度的受拉破坏;随着侧压系数的增大,开挖对巷道顶板的影响最大,其次为底板,对两帮的影响最小,其中,随着开挖深度的增大,两帮侧在距巷道内壁0~1 m处围岩最先发生破坏。In order to study the influence of rectangular tunnel excavation on the stability of surrounding rock,based on the actual data of Papaya Coal Mine,a numerical calculation model was established using FLAC3Dto investigate the influence of different lateral pressure coefficients on the stability of surrounding rock in rectangular tunnels.The results show that as the excavation depth increases,the principal stress difference between the top and bottom plates first increases and then tends to stabilize,while the rate of increase of the principal stress difference at the two sides shows a slow first,then rapid increase,and finally stable trend.Excavation has the greatest impact on the surrounding rock within a range of 0~5 meters from the working face,and is also the most prone to plastic zones.As the excavation depth increases,the surrounding rock of the roadway undergoes varying degrees of shear failure,and the roof and roof experience varying degrees of tensile failure.As the lateral pressure coefficient increases,excavation has the greatest impact on the top plate of the roadway,followed by the bottom plate,and the smallest impact on the two sides.Among them,as the excavation depth increases,the surrounding rock of the two sides first fails at a distance of 0~1 m from the inner wall of the roadway.

关 键 词：巷道稳定性 侧压系数 开挖 数值模拟 

分 类 号：TD322[矿业工程—矿井建设]