穿越大落差积水矿坑隧道渗流-应力耦合作用下变形特征研究  

Study on the Deformation Characteristics of a Tunnel Crossing a Large Drop Water-Filled Mine Pit Under Seepage-Stress Coupling

作　　者：郭鑫 GUO Xin(China Railway 18th Bureau Group Third Engineering Co.,Ltd.,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《国防交通工程与技术》2025年第1期14-18,80,共6页Traffic Engineering and Technology for National Defence

摘　　要：为探明穿越大落差积水矿坑的隧道洞口仰坡在渗流作用下的稳定性及变形特征,以西部某隧道为工程背景,首先对隧道在渗流作用下及渗流-应力作用下的解析方程进行分析,其次开展了室内试验对隧道岩土体物理力学参数进行测定,在理论与试验基础上,采用FLAC3D数值模拟软件建立了隧道渗流数值模型,通过设计两种危险渗流工况对隧道围岩及仰坡变形进行计算分析。研究结果表明:只考虑应力场的影响时,拱顶的变形量最大,仰拱的变形量最小,应力场对隧道顶部的影响较大;只考虑渗流场的影响时,在不同孔隙水压的渗流下,拱顶和拱肩的变形量最大,仰拱变形量最小。在两场耦合的作用下,两积水坑水位不同,对隧道不同部位的影响程度也不相同,因此在开挖隧道时,需要考虑如何阻断其渗流作用、减少渗流对隧道的影响。To clarify the stability and deformation characteristics of the entrance slope of a tunnel traversing a large drop water-filled mine pit under seepage conditions,a tunnel project in western China was selected as the engineering background.First,the analytical equations governing tunnel behavior under seepage-only and combined seepage-stress conditions were examined.Subsequently,a series of laboratory tests were conducted to determine the physical and mechanical parameters of the rock and soil surrounding the tunnel.On the basis of these theoretical and experimental results,a three-dimensional numerical model was established using FLAC3D,and two critical seepage scenarios were designed to assess their effects on the tunnel's surrounding rock and entrance slope.The results show that,when only the stress field is considered,the arch crown exhibits the largest deformation,whereas the inverted arch undergoes the smallest deformation.Under varying pore water pressures,both the vault and arch shoulder experience the greatest deformation,with minimal deformation in the inverted arch.Under the coupled seepage-stress condition,different water levels in the two accumulated pits induce varying degrees of influence on different parts of the tunnel.Accordingly,it is vital during tunnel excavation to consider methods for blocking or reducing seepage to mitigate adverse impacts on the tunnel structure.

关 键 词：隧道工程 流-固耦合 围岩变形 仰坡滑移 力学试验 数值模拟 

分 类 号：U453.6[建筑科学—桥梁与隧道工程]