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The sum of the number of blows required for the second and third 15 cm (6 in) intervals of penetration is termed the "standard penetration resistance" or the "N-value". N-value provides an indication of the density of the ground, and it is used in many empirical geotechnical engineering formulae.
The N value shall be recorded as the sum of number of blows of the drive hammer required to achieve the last 300mm of shoe penetration OR the sum of number of blows of the drive hammer with the penetration achieved
标准贯入试验（standard penetration test，SPT）是动力触探的一种，是在现场测定砂或粘性土的地基承载力的一种方法。. 这一方法已被列入中国国家《工业与民用建筑地基基础设计规范》中。. 它利用一定的锤击功能 ( 锤重63. 5kg ， 落距76cm ) ， 将一定规格的对开管式 ...
Standard penetration test (SPT) N-value – the number of hammer blows required to drive a drill rod with an attached soil sampler 300 mm or 12 inches into soil (or weak rock); this N-value yields information on the geotechnical engineering properties of the soil
2022年7月24日 · The standard penetration test (SPT) is made in boreholes by means of the standard 50.8 mm outside and 33.8 mm inside diameter split spoon sampler. It is a very useful method for estimating the in-situ density of cohesionless soils, and when modified by a cone end, it can also be used to assess the relative strength or deformability of rocks.
The sum of the number of blows required for the second and third 6 in. of penetration is reported as SPT blowcount value, commonly termed "standard penetration resistance" or the "N-value". The N-value provides an indication of the relative density of the subsurface soil, and it is used in empirical geotechnical correlation to estimate the ...
Before the SPT values are used in empirical correlations and in design charts, the field ‘N’ value have to be corrected as per IS 2131 – 1981. The corrections are: Dilatancy Correction. Overburden Pressure Correction. 1. Dilatancy Correction.
