How should backfilling be managed in relation to the removal of support systems?

Backfilling should progress together with the removal of support systems to ensure stability and safety at the excavation site. This method allows for the immediate support of the surrounding soil as the support systems, such as shoring or bracing, are taken out. When backfilling occurs concurrently with the removal, it helps to prevent potential collapse or shifting of the earth that could happen if the support systems were fully removed before backfilling begins. This integrated approach maintains the structural integrity of the excavation walls, reducing risks for workers and equipment.

In scenarios where backfilling takes place separately or waits until all support systems are removed, there could be increased risk of ground subsidence or instability, which can lead to hazardous conditions. Additionally, if backfilling is deemed unnecessary, it overlooks the importance of ensuring the excavation maintains its integrity and is safely filled to prevent voids and potential issues in the future.