More information (formats. PDF):
a. Reliability of shallow foundation design using the Standard Penetration Test
b. Table 1 summarizes a total of 27 sources of uncertainty and bias, classified in five categories. This classification aims to assist the practicing engineer in taking the necessary measures to minimize the uncertainties in the performance of the test:
Category A includes sources that depend on the type of soil, with emphasis in sources related to granular materials since the use of the SPT is generally not recommended for cohesive soils.
Category B lists sources of uncertainty due to the presence of water.
Category C includes reducible sources re-lated to the equipment and its maintenance.
Category D includes sources that are reducible if the test procedure is performed care-fully.
Category E lists irreducible sources in the investigation procedure.
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