摘要
为直观了解盾构隧道施工过程中壁后注浆压力对土体变形的影响,分析盾构隧道注浆压力大小对管片上浮的影响,保证在隧道施工过程中采用合理的注浆压力,控制地表变形量。采用FLAC3D软件对上海某越江隧道施工过程进行了数值模拟,分析注浆压力对管片上浮的影响。结果表明:在不同注浆压力及不同分布形式情况下,土体受扰动程度差异较大;当注浆浆液充填等待层后,随着注浆浆液逐渐硬化,盾构隧道管片会逐渐形成上浮趋势,上浮量与注浆压力有关,当注浆压力控制在0.2～0.3MPa时,地表变形量可以得到有效控制,所以施工中应该值得注意。同时也为今后的盾构隧道数值模拟与现场施工提供参考。
To intuitively understand the effect of shield tunnel backfill grouting pressure on the soil deformation and thus to control the ground surface deformation,numerical simulation was carried out by FLAC3D on the construction process of a river-crossing tunnel in Shanghai,and the effect of grouting pressure on tunnel segment floating was analyzed.It＇s concluded that the soil disturbance varies largely under different grouting pressures and pressure distributions.The tunnel segments exhibits a trend of floating after the grouting slurry were hardened.Ground surface deformation could be effectively controlled when the grouting pressure is between 0.2-0.3MPa.The floating of tunnel segments is affected by the weight of itself,the depth of overburden soil,and the grouting pressure and pressure distribution.The research provides reference for the numerical simulation and construction of shield tunnels.
出处
《长江科学院院报》
CSCD
北大核心
2012年第11期68-72,共5页
Journal of Changjiang River Scientific Research Institute
