I reviewed a load test where a 25 foot 18 inch diameter augercast pile was loaded to 100 tons. The total deflection was 0.9 inches and had a net settlement of 0.75 inches.
While the Davisson and other popular interperative methods do not have a criteria for net settlement, the local building code here has one that states "The resulting allowable load shall be not more than one-half of that test load which produces a permanent net settlement per ton of test load of not more than 0.01 inch, but in no case more than 3/4 inch."
Does anyone know the origins of the plastic settlement/unit load ratio of 0.01, and what does this really mean? Is it a reliable 'failure criteria'? From what formal (ie published) method/research is this derived?
While the Davisson and other popular interperative methods do not have a criteria for net settlement, the local building code here has one that states "The resulting allowable load shall be not more than one-half of that test load which produces a permanent net settlement per ton of test load of not more than 0.01 inch, but in no case more than 3/4 inch."
Does anyone know the origins of the plastic settlement/unit load ratio of 0.01, and what does this really mean? Is it a reliable 'failure criteria'? From what formal (ie published) method/research is this derived?
