CE3400 HW3-Solution Fall 2009

CE3400 HW3-Solution Fall 2009 - (2) Sample is driven not...

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CE235 Solution to Homework 3 Fall 2003 1. A – hole will stay open, too many borings to hand auger ` B – clean sand will collapse, therefore, need drilling mud to keep open C – no overhead for big drill, only 2 borings B – very soft clay will squeeze, therefore, need drilling mud to keep hole open 2. % 111 % 100 375 . 1 375 . 1 2 % 100 2 2 2 2 2 2 = = = S S o r D D D A 3. % 9 . 8 % 100 875 . 2 875 . 2 3 % 100 2 2 2 2 2 2 = = = S S o r D D D A 4. (1) Area Ratio is too large
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Unformatted text preview: (2) Sample is driven not pushed Both of these cause excessive sample disturbance 5. See comparison in site exploration handout 6. Boring log should look like log on page 58 of Coduto. The N value for each soil layer is the sum of the last 12 inches of driving the sampler (8, 15, 19, 23, 52, 74, refusal for the 7 layers )...
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