plsss..help me..
2007-03-07 15:19:50 · 4 answers · asked by grandest shiela s 2 in Science & Mathematics ➔ Earth Sciences & Geology
Copy/pasted from: Deep compaction of granular soils by Dr K. Rainer Massarsch
"The SPT is a well-established and unsophisticated method, which was developed in the United States around 1925. It has since undergone refinements with respect to equipment and testing procedure. The testing procedure varies in different parts of the world. Therefore, standardisation of SPT was essential in order to facilitate the comparison of results from different investigations. The equipment is simple, relatively inexpensive and rugged. Another advantage is that representative but disturbed soil samples are obtained. The reliability of the method and the accuracy of the result depend largely on the experience and care of the engineer on site.
A split-barrel sampler is driven from the bottom of a pre-bored hole into the soil by means of a 63.5 kg hammer, dropped freely from a height of 0.76 m. The diameter of the pre-bored hole varies normally between 60 and 200 mm. If the hole does not stay open by itself, casing or drilling mud should be used. The sampler is first driven to a depth of 15 cm below the bottom of the pre-bored hole, then the number of blows required to drive the sampler another 30 cm into the soil, the so called N30 count, is recorded. The rods used for driving the sampler should have sufficient stiffness. Normally, when sampling is carried out to depths greater than around 15 m, 54 mm rods are used."
2007-03-07 16:23:55 · answer #1 · answered by Now and Then Comes a Thought 6 · 2⤊ 1⤋
A standard penetration test for soil can be a metal spike and a sliding drop weight. You measure the amount of penetration into the soil for a set amount of blows and compare it to other measurements that you have taken.
And Yes Soil Science is boring. I did it at university
2007-03-07 16:05:09 · answer #2 · answered by Professor Kitty 6 · 0⤊ 0⤋
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2016-12-18 08:11:18 · answer #3 · answered by ? 4 · 0⤊ 0⤋
According to this site, it is a core that is taken in 150mm lengths. This goes up to 450 mm. This is 3 150mm cores.
The purpose is to see what type of soil it is and if it can do the job that will be needed of it.
2007-03-07 15:34:29 · answer #4 · answered by eric l 6 · 0⤊ 1⤋