Showing papers on "Standard penetration test published in 1980"

Liquefaction Study of Cemented Sand

Abstract: The paper describes some aspects of a liquefaction investigation of a variably cemented sandy profile. Due to the difficulty involved in extracting undisturbed samples for testing an evaluation was made of the use of standard penetration test results (i.e., blow counts) and samples in studying such profiles. A method of obtaining intact specimens for laboratory testing, by block sampling, freezing, and coring was developed, and cyclic triaxial tests performed on specimens obtained in this way provided cyclic strength data relevant for the soils encountered in the profile. These results were compared to those obtained by testing reconstituted specimens and were considered to be more relevant to in-situ conditions.

Prediction of footing settlements on sand

Abstract: The prediction of settlements for footings resting on sands always involves the use of empirical methods and the complexity of a method is no measure of its accuracy. In this method the relative density of a sand deposit is established empirically from the results of a standard penetration test (spt) and then, using empirical stress strain relationships for sands of various densities, the strains below a footing are predicted and integrated to give the total settlement of the footing. The only field data required in the method are the spt results down the profile, though other means of establishing the relative density of the sand deposit would be equally satisfactory. The method has been checked with the use of load settlement data extracted from 94 published case histories. In 50 per cent of the cases the ratio of estimated to observed settlement lies between 0.67 And 1.5, While in 73 per cent of the cases the ratio lies between 0.5 And 2.0.