Compensation Grout Design for the San Francisco Central Subway Project

摘要

The use of compensation grouting in urban areas on tunnel projects has been widely used inrnEurope, with the list of projects successfully employing its use in the US steadily growing. While referencesrnexist for engineers to develop a compensation grouting design, most designs are site specific and require arnfair amount of practical experience to properly adjust the program and advise during construction. This paperrndiscusses the specific design approach implemented for the San Francisco Central Subway Project and may servernas reference on future projects in similar conditions. The design approach, preparatory works, pipe installationrnand ground preconditioning, active compensation grouting during TBM passage, and results are covered.