Abstract
Standard Penetration Test (SPT) is one of the most commonly used methods of geotechnical subsurface exploration. The soil parameters for design of building foundations are frequently based on SPT results. The accuracy of measurement of SPT blow count (N-Value), therefore, highly influences the design and construction of foundations of structures. Although there are uncertainties involved in the determination of N-Value inherent to the procedure of the test, these can be minimised by maintaining close adherence to the accepted standard method of testing and instrumentation. In this work a series Standard Penetration Tests were carried out using a non-standard (damaged due to prolonged use) sampler cutting shoe and the results were compared with N-values obtained by using a standard sampler shoe. The effect of using the overused sampler shoe on SPT value is presented.
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