Abstract:

The foundation pit for the entrance and exit of the rehabilitation project of an existing station of Tianjin Metro is 6-7m deep. The foundation pit is located in downtown area and is surrounded by buildings and utility pipelines. Used rails are inserted into the tensioning area of the cementsoil mixing piles to form retaining structures consisting of rigid cementsoil mixing piles. Such retaining structure is adopted for the foundation pit in order to meet the requirements of the site conditions and to reduce the construction cost. The experiment on the construction workmanship, performance and rail lifting of the retaining structure consisting of rigid railcementsoil mixing piles are presented in the paper. The conclusions drawn have provided direct guidance for the safe application of this construction technology in the project. The paper can provide reference for similar projects in the future.

Key words: railcementsoil mixing pile , retaining structure for foundation pit , lifting force  experimental study