深埋富水隧道围岩-衬砌流固耦合特征分析

Analysis on Fluid-Structure Interaction Characteristics Between Surrounding Rockand Lining of Deep-buried Water-rich Tunnel

地下水渗流严重影响隧道的安全施工和正常使用,文章采用COMSOL模拟软件,构建富水条件下的马蹄形隧道模型,经过流固耦合计算获取考虑渗流场影响条件下的流线分布特征,以及应力分布情况,分析得出以下结论:耦合后隧道的压力减小,但保持了由上至下、由外向内增加的变化特征;隧道受渗透作用影响,拱脚处衬砌的最大压应力小于抗压强度,拉应力大于抗拉强度,出现损伤区。

Groundwater seepage seriously affects the safe construction and normal use of the tunnel.COMSOL simulation software is used to construct a horseshoe tunnel model under water-rich conditions.Through fluidstructure interaction calculation,the streamline distribution characteristics and stress distribution under the influence of seepage field are obtained.The following conclusions are drawn:the pressure of the tunnel decreases after interaction,but it maintains the change characteristics of increasing from top to bottom and from outside to inside;under the influence of seepage,the maximum compressive stress of the lining at the arch foot is less than the compressive strength,and the tensile stress is greater than the tensile strength,resulting in damage zones.