施工顺序影响沉管隧道基础灌砂模型试验

基础灌砂是沉管隧道工程施工中常用的基础处理方法。为了解决沉管隧道基础灌砂施工顺序的问题,通过对等比例灌砂模型灌砂实时观测试验,探讨了不同灌砂施工顺序对底板压力及砂积盘扩散的影响。研究表明:不同的灌砂顺序,对于灌砂效果有着明显的影响。先灌砂对后灌砂在特定方向上具有影响;后灌砂时,灌砂效果受先灌砂的影响,灌砂时间大大缩短,后灌砂会造成已灌砂完成的区域底板压力增大。

Model Experiment on the Impact of Filling Sand Construction Sequence on Immersed Tunnel Foundation

Filling sand method is one of the main construction method of foundation treatment in immersed tunnel engineering. In order to solve the problem of filling sand construction sequence, based on the real-time observation of filling sand in the equivalence ratio model test, the influence of filling sand construction sequence on the bottom pressure and the diffusion of sand deposit was discussed. Research shows that filling sand construction sequence has a corresponding influence on foundation treatment. Early stage filling sand construction influences the late stage filling sand construction in a particular direction. Because of the early filling sand construction, the time of late stage filling sand construction is greatly reduced. Late stage filling sand will lead to the floor pressure increase in the completed filling sand area.