摘要
针对常德—吉首高速公路中蓖麻溪双连拱隧道工程,使用计算软件FLAC3D,在考虑水的渗流效应和不考虑水的渗流效应的两种情况下,分别对隧道围岩进行三维数值分析。得到了两种情况下的隧道围岩在分步开挖时的应力场、位移场的变化情况,以及围岩稳定性的分析。结论表明,考虑渗流效应的隧道围岩应力小于不考虑渗流效应时计算出的围岩应力;考虑渗流效应的围岩竖向位移远大于不考虑渗流作用的围岩竖向位移,而两种情况下的水平位移则相差不大;考虑渗流情况下的围岩的稳定性比不考虑渗流情况稍差。结论将为该隧道施工和防渗设计提供依据。
Pointing to the Bimaxi twin-arched tunnel of Changde-Jishou Express Highway and by using the FLAC^3D software,the three-dimensional numerical analysis for the surrounding rock of the tunnel is carried out under two kinds of conditions of considering and unconsidering the seepage effect of water.And the changes of the stress field and bias field of the surrounding rock of the tunnel under two kinds of conditions and with the staged excavation are obtained as well as the stability analysis of the surrounding rock.The conclusion indicates that the stress of the surrounding rock of the tunnel when considering the seepage effect is lower than that when unconsidering;the vertical displacement of the surrounding rock when considering the seepage effect is much bigger than that when unconsidering,but the difference of the horizontal displacement under two kinds of conditions is a little;and the stability of the surrounding rock when considering the seepage effect is worse than that when unconsidering.The conclusions will provide references for the construction and design of the seepage control of the tunnel.
出处
《水利与建筑工程学报》
2007年第4期26-30,34,共6页
Journal of Water Resources and Architectural Engineering
基金
湖南省交通科技项目(200516)<山区公路隧道渗流理论与控制技术研究>
