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(Solved): Soil Sampling, Laboratory Tests And Standard Penetration Tests Are Carried Out For A Geotechnical In...


Soil sampling, laboratory tests and standard penetration tests are carried out for a geotechnical investiagtion site. The int

Soil sampling, laboratory tests and standard penetration tests are carried out for a geotechnical investiagtion site. The interpreted boring log is shown below. The efficiency of the SPT hammer is 65% and the diameter of borehole is 150 mm. The sieve analysis on the silly sand layer shows that Dso0.2 mm. Using these information determine: a) Consistency, undrained shear strength and OCR of the cohesive layer. b) Relative density (using kulwahy and Mayne eq.), and the angle of friction (using Uchida eq.) for the silty sand layer. Assume the age of soil deposition = 1 million years, and the OCR=1. c) Based on the relative density from part b, comment on the type of soil (whether it is loose ...) Depth (ft) GWT Blows Unit Per six Weight inches (pcf) Soil Description sandy Clay Silty Sand 9,17,14 126


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a.N is the measure SPT N value = sum of last two increments For the clay layer = (7 + 5 ) = 12blows/ft N60 =CERCBCSCRN CER= 65/60 = 1.08 [65% hammer efficiency] CB= 1 [for
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