公路隧道揭煤掌子面前方围岩应力分布规律  

Stress Distribution Law of Surrounding Rock in Front of Tunnels Face During Coal Seam Penetration in Highway Tunnels

作　　者：龙其毕 黄飞 罗亚飞[1,2] 钟小凤 刘磊 LONG Qibi;HUANG Fei;LUO Yafei;ZHONG Xiaofeng;LIU Lei(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disaster for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭411201

出　　处：《矿业工程研究》2025年第1期50-56,共7页Mineral Engineering Research

基　　金：国家自然科学基金面上资助项目(52274198)。

摘　　要：为了研究扁平大跨度公路隧道揭煤掌子面前方围岩的应力分布规律,以松坎隧道为工程背景,采用FLAC 3D数值模拟软件构建隧道穿越煤层的数值计算模型,分析掌子面前方围岩的应力演化规律.研究结果表明:(1)隧道掘进过程中,掌子面前方围岩的垂直应力均呈现先急剧增大后逐渐衰减至原岩应力的趋势,但掌子面前方不同位置处的围岩所受垂直应力集中系数有所差异,具体表现为隧道底部应力集中系数大于隧道顶部,隧道左侧应力集中系数大于右侧;(2)随着掌子面与煤层距离减小,围岩垂直应力的变化区域宽度呈现先减小后增大的“V”型变化趋势,隧道左侧的应力变化区域宽度变化幅度大于右侧;(3)掌子面前方围岩内的水平应力呈现出从零逐渐增大至原岩应力的变化趋势,掌子面离煤层越近,前方围岩水平应力增幅越小.In order to study the stress distribution law of surrounding rock in front of the tunnel face in flat large-span highway tunnel,taking Songkan tunnel as the engineering background,the numerical calculation model of tunnel crossing coal seam is constructed by FLAC 3D numerical simulation software,and the stress evolution law of surrounding rock in front of the tunnel face is analyzed.The results show that firstly,in the process of tunnel excavation,the vertical stress of the surrounding rock in front of the tunnel face increases sharply at first and then decreases gradually to the original rock stress.However,the vertical stress concentration factors of the surrounding rock at different positions in front of the tunnel face are different.The stress concentration factor at the bottom of the tunnel is greater than that at the top of the tunnel,and the stress concentration factor on the left side of the tunnel is greater than that on the right side.Secondly,as the distance between the tunnel face and the coal seam decreases,the width of the change area of the vertical stress of the surrounding rock decreases first and then increases in a shaped“V”.The width of the stress change area on the left side of the tunnel is larger than that on the right side.Lastly,the horizontal stress in the surrounding rock in front of the tunnel face shows a trend of increase from zero to the original rock stress.The closer the tunnel face is to the coal seam,the smaller the increase of the horizontal stress of the surrounding rock in front of the tunnel face.

关 键 词：隧道 掌子面 应力分布 煤系地层 数值模拟 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]