Abstract: The long flight auger with super flow concreting method was used in the installation of the supporting system of a deep excavation in soft soils. The defects of the castinpace piles and their mitigations are also presented. Increasing the soldier pile spacing, improving the cast in place pile installation procedure as well as the pile integrity testing are the major components of a successful long flight auger with super flow concreting method application in the soft soils.

Key words: Long bored piles, Soft soil, Defects of pile, Low strain dynamic testing