The Use of Shape Accel Arrays (SAA) for Measuring Retaining Wall Deflection

Summary

The measurement of deflection of designed diaphragm walls is critical for near real time information to assess wall and soil behaviour as the internal area is excavated in a controlled manner. Data enables the site team and designers to check performance of the design, which is linked to safeguarding the site and the external stakeholders.
This paper documents the use of Shape Accel Arrays at the Tottenham Court Road Western Ticket Hall during excavation and propping within the diaphragm wall for the Crossrail project and how it is used within the site settlement management plan to assist in the control of the works and the information to be used for Value Engineering purposes that benefitted the project.