Standard penetration test corrected
Standard penetration test
This chapter mainly focuses on the Standard Penetration Test, its correction and correlations with different soil properties. Standard Penetration Test (SPT).
STANDARD PENETRATION TEST (SPT) CORRECTION
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Description:If the samples are found to be unacceptably disturbed, it may be necessary to use a different method for measuring strength like the plate test. Procedure[ edit ] The test uses a thick-walled sample tube, with an outside diameter of In certain circumstances, it can be useful to continue driving the sampler beyond the distance specified, adding further drilling rods as necessary. The sum of the number of blows required for the second and third 6 in. The soil strength parameters which can be inferred are approximate, but may give a useful guide in ground conditions where it may not be possible to obtain borehole samples of adequate quality like gravels, sands, silts , clay containing sand or gravel and weak rock. The SPT is used to provide results for empirical determination of a sand layer's susceptibility to soil liquefaction , based on research performed by Harry Seed, T. SPT results are in-situ field measurements, and not as subject to sample disturbance, and are often the only test results available, therefore the use of correlations has become common practice in many countries.