Monitoring the construction of a large-diameter caisson in sand

Large-diameter open caissons are a widely used construction solution for deep foundations, underground storage and attenuation tanks, pumping stations, launch reception shafts tunnel boring machines. The sinking phase presents number of challenges during construction, including maintaining caisson verticality, controlling the rate minimising soil resistance through use lubricating fluids. This paper describes instrumentation monitoring large-diameter on UK site. was instrumented measurement settlement tilt, soil–structure interaction contact stresses structural performance. A key objective project to provide real-time feedback site engineering team inform process. monitored data revealed occurrence complex interactions that not readily captured by existing prescriptive design approaches. case history provides valuable information development an improved basis as well important frame reference future projects.