CAISSONS (Cont’d)

During unwatering a caisson in cohesionless soils, the upward flow from the surrounding groundwater induces a quick condition which results in loss of strength at the bottom of excavation.

To prevent quick condition, the head difference causing flow should be kept low.

Caissons should not be used in the vicinity of existing structures that can be damaged due to loss of ground from beneath their foundations.

During unwatering a caisson in cohesionless soils, the upward flow from the surrounding groundwater induces a quick condition which results in loss of strength at the bottom of excavation.