超深淤泥质下穿隧道再生材料围堰关键技术研究应用

Research and Application of Key Technologies of Reclaimed Material Cofferdam for Ultra-deep Muddy Undercrossing Tunnel

该项目为灞河下穿明挖隧道,是十四运会重难点项目。隧道全长2896m,下穿600m全宽主河道,隧道距橡胶坝坝体不足100m,隧道底界距淤泥层顶约14m淤泥,淤泥沉淀时间短,呈软塑~流塑状,超深泥流态淤泥开挖围护难度大,可参考经验少,通过总结研究及实践,攻克了关键技术难关,提高了施工效率,节约了投资,保证了安全质量及工期。

This project is an open-cut tunnel under the Bahe River,which is an important and difficult project of the 14 th National Games.The total length of the tunnel is 2.896 kilometers,which passes through the main river channel with a width of 600 meters.The distance between the tunnel and the rubber dam body is less than 100 meters,and the bottom boundary of the tunnel is about 14 meters away from the top of the silt layer.The silt has a short settling time,which is in the form of soft plastic~flowing plastic.It is difficult to excavate and protect the ultra-deep mud flow silt,and there is little reference experience.By summarizing the research and practice,the key technical difficulties have been overcome,the construction efficiency has been improved,the investment has been saved,and the safety quality and the construction period have been guaranteed.