A CME 550 drill rig was used for a recent field investigation. Hollow stem augers with...

 

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A CME 550 drill rig was used for a recent field investigation. Hollow stem augers with external flight diameter of 7.625-inch and inside diameter of 4.25-inch were used to drive the borehole. The following information was required by the geotechnical engineer logging the soil boring: • Depth of standard penetration test (SPT) was 16 feet below ground surface (bgs) Soil was a clayey SAND Drill rig was equipped with an auto-trip hammer for driving the split-spoon sampler Hammer was calibrated to the standard drop height and weight per ASTM D1586 and is 60 % efficient in its energy ratings. • During the SPT: 7 blows to drive the sampler from 16' to 16.5' bgs 4 blows to drive the sampler from 16.5' to 17.0' bgs 12 blows to drive the sampler from 17.0' to 17.5' bgs Determine the N-value, N60 value and the Noor value. Ignore the sample liner correction. What is the compactness of the soil? i. ii. iii. A CME 550 drill rig was used for a recent field investigation. Hollow stem augers with external flight diameter of 7.625-inch and inside diameter of 4.25-inch were used to drive the borehole. The following information was required by the geotechnical engineer logging the soil boring: • Depth of standard penetration test (SPT) was 16 feet below ground surface (bgs) Soil was a clayey SAND Drill rig was equipped with an auto-trip hammer for driving the split-spoon sampler Hammer was calibrated to the standard drop height and weight per ASTM D1586 and is 60 % efficient in its energy ratings. • During the SPT: 7 blows to drive the sampler from 16' to 16.5' bgs 4 blows to drive the sampler from 16.5' to 17.0' bgs 12 blows to drive the sampler from 17.0' to 17.5' bgs Determine the N-value, N60 value and the Noor value. Ignore the sample liner correction. What is the compactness of the soil? i. ii. iii.

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To determine the Nvalue Neo value and the Ne value well follow these steps Calculate Nvalue The Nval... View the full answer