多层采空区影响下隧道内力变化的数值研究  

Numerical Study on Internal Force Change of Tunnel under Influence of Multi-layer Goaf

作　　者：刘俊佳 LIU Junjia

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2022年第9期244-247,M0021,共5页Urban Roads Bridges & Flood Control

摘　　要：针对具体工程案例,建立了隧道下穿2层、上覆1层的采空区数值模型,得到了隧道开挖后隧道变形、衬砌结构内力及地层变化的规律,探究了多层采空区对隧道的叠加效应。结果表明:隧道上下的采空区对隧道变形的影响规律不同;多层采空区的存在大大增加了支护结构的截面偏心距,从而降低了结构的承载能力;有无采空区时隧道周围的地层变形特征差异显著。Aiming at a specific engineering case,the numerical model of the goaf with two layers below the tunnel and one layer above the tunnel is established to obtain the rules of the deformation of the tunnel,the internal force of the lining structure and the change of the stratum after the tunnel excavation,and to explore the superposition effect of the multi-layer goaf on the tunnel.The results show that the influencing rules of goafs above and below the tunnel on the deformation of the tunnel are different.The existence of multi-layer goaf greatly increases the section eccentricity of the support structure so as to reduce the bearing capacity of the structure.The deformation characteristics of the strata around the tunnel are significantly different with or without goaf.

关 键 词：多层采空区 公路隧道 收敛位移 衬砌内力 

分 类 号：U451[建筑科学—桥梁与隧道工程]