Application Of Freezing Method:Case Study On The Metro Connected Aisle Which Is In The Fine Sand That Contains Highly Confined Water

In recent years, with China’s rapid economic development and city urbanizationconstruction pace accelerate, especially the expanding of the big city, many city started toconstruct or prepare to construct the city underground rail transit system. The subwaytunnel’s construction risk mainly exists in the tunnel excavation and the construction of theconnected aisle, and the connected aisle’s risk is more common. The construction of theconnected aisle usually use the subsurface excavation method, and its’ always cause theexcavation surface soil instability for the unwell soil reinforcement, which will lead to thetunnel lining structure damaged and the surrounding building destroyed. Especially in thesand, and the highly confined water area, if the soil reinforcement was not very well, thewater sealing will become weak, the results are sand deflection and water-bursting whichmake the excavation more dangerous.The purpose of this research are: on the one hand we can quickly grasp the desigh andconstruction method and also the construction process of the connecting passage that is in thefine sand with highly confined water, on the other hand we can excavate the connectingpassage more safely. This research is mainly about the connecting passage of the risk analysis,the frozen effect examination, the prevention and remedial of the construction quality defects;This research is mainly about the risk analysis of the soil reinforcement, the frozen effectexamination, the construction quality defects, and its’ prevention and remedial of theconnecting passage using freeing method, which is in the sand and the highly confined waterarea. It can give a guidance and reference which have similar geological conditions.