Field and Laboratory Data from Pile Load Tests in Calcareous Soil

摘要

Grouted piles are used extensively in offshore deposits of calcareous soils, because of the relatively low shaft capacity of driven piles. Two construction techniques may be used: drilled and grouted piles, where steel pipes are grouted into pre-drilled oversize holes; and grouted driven piles, where driven pipe piles are pressure-grouted through valves distributed along the pile shaft. The paper describes the results of a comprehensive set of field and laboratory tests on grouted piles that were undertaken in calcarenite in Australia, to validate pile design for the calcareous deposits which predominate off the coast of Australia. The experimental results were used to validate and calibrate a numerical load transfer model, that simulates degradation and accumulation of permanent displacement under cyclic loading. The paper provides a recommended design approach for grouted piles in calcareous soil, with due account taken of construction technique, pile diameter and soil strength as indicated by the cone resistance.