深层超前预加固咬合桩在粉细砂隧道施工中的应用

Deep Pile ahead of pre-reinforcement in fine sand in the application of tunnel construction

某铁路隧道粉细砂不良地质地段采用一般加固工艺,不能满足施工安全及进度要求,采用深层超前预加固咬合桩,可为开挖提拱强力支护,减少隧道坍塌和渗水的可能性,本文对深层超前预加固咬合桩加固机理、施工工艺等进行了归纳,对各工序的施工要点进行了阐述。

a railway tunnel adverse geological sites of fine sand reinforced using the general process,can not meet the construction safety and progress requirements,the use of advanced pre-reinforcement Pile deep,strong support for the excavation Tigong care,reducing the tunnel collapse and water seepage possibility,the paper bite deep pile ahead of pre-reinforcement mechanism,construction techniques,etc.have been summarized for the various processes of the construction elements are described.