土石交界地质条件下浅埋隧道的开挖反应研究  

Study on Excavation Reaction of Shallow Tunnel Under the Boundary Condition of Soil and Rock

作　　者：孙文君 薛少强 肖成志 宋杨 孙文杰 SUN Wenjun;XUE Shaoqiang;XIAO Chengzhi;SONG Yang;SUN Wenjie(Hebei University of Water Resources and Electric Engineering,Cangzhou,Hebei 061000,China;Hebei University of Technology,Tianjin 300401,China;Hebei Zhumei Engineering,Design,Co.,Ltd.,Cangzhou,Hebei 061001,China)

机构地区：[1]河北水利电力学院,河北沧州061000 [2]河北工业大学土木与交通学院,天津300401 [3]河北筑美工程设计有限公司,河北沧州061001

出　　处：《公路工程》2019年第4期169-173,共5页Highway Engineering

基　　金：河北省省级科技计划自筹经费项目(16275419);河北省高等学校科学技术研究青年基金项目(QN2019102);河北省自然基金资助项目(E2018412002)

摘　　要：不同地质介质交界的复杂地质状况对于隧道工程的开挖建设带来很大困难,土石交界地层是这种地质情况的典型代表。针对该地质条件下的隧道开挖问题,以某浅埋公路隧道为工程背景,展开了不同掘进方向和不同土石界面倾角下的隧道开挖反应数值模拟,对比了不同掘进方向下的隧道开挖反应特征,分析了土石界面倾角对隧道开挖反应的影响。结果显示:不同掘进方向下,在土石界面倾角较小时隧道围岩竖向变形规律差别较大,在土石界面倾角较大时其围岩竖向变形规律相近;随着土石界面倾角的增大,当隧道由黄土地层向破碎岩体掘进时,其拱顶变形量减小;当隧道由破碎岩体向黄土地层掘进时,隧道拱顶变形量随着掌子面的远离先增大后减小规律减弱并消失。The complex geological conditions at the junction of different geological media bring great difficulties to the excavation construction of tunnel engineering.The soil-rock boundary stratum is a typical representative of this geological situation.In response to tunnel excavation problems under that geological condition,based on a shallow buried highway tunnel,the numerical simulation of tunnel excavation response under different digging directions and different earth-rock interface dip angles is carried out.The characteristics of tunnel excavation response under different tunneling directions are compared.The influence of dip angle of soil-rock interface on tunnel excavation reaction is analyzed.The results show:Under different tunneling directions,the vertical deformation law of tunnel surrounding rock is different when the dip angle of soil-rock interface is small,and it is similar when the dip angle of soil-rock interface is large;With the increase of the dip angle of the soil-rock interface,when the tunnel is excavated from the loess layer to the fractured rock mass,the deformation of the dome is reduced.When the tunnel is driven from the fractured rock mass to the loess layer,the deformation law of the tunnel dome weakens and disappears,which first increase and then decrease as the working face moves away.

关 键 词：开挖反应 土石交界 掘进方向 

分 类 号：U451[建筑科学—桥梁与隧道工程]