4) The proposed building is a 80-storey heavy steel building approximately 100-f

Question

4) The proposed building is a 80-storey heavy steel building approximately 100-ft wide Use information in section 12.2, and estimate depth of boring (in Round it off to the next higher whole meter meters) for soil exploration 6 (30 5) Use the following as many times as you need for choosing the most suitable match for (a) to (1) given below, and write that word/phrase in the blank space _ (based on your reading of sections 12.1 to 12.5, class notes, and videos watched) True or False response. True Wash boring Percussion drilling False False Shelby tube Split spoon True Auger boring Rotary gtrilling Hammer and pulley a) There are no hard and fast rules to decide the spacing of boreholes for soil- testing In thepots delag ethodof spratory borings. a method of exploratory borings, a drilling bit cuts and grinds the soil while drilling mud (bentonite slurry) is circulated method of exploratory borings raises and drops a chopping bit to advance a borehole. d) Soil samples collected by the standard split-spoon (S5) sampler can be used for soil classification u-e) Higher the standard penetration number (Ne), stiffer the soit la._. ) Lower the standard penetration number (NiJeo, higher the solil's relative density lse Obtain the following standard values for the 'standard penetration test, SPT (a) Weight of the hammer in Newtons. 63.5k35 622N (b) Hammer drop distance in mm 6mm (c) Penetration depth in mm (corresponding to the .standard penetration number, N). (d) Inner diameter of the standard split-spoon (SS) sampler in mm 35m (e) Outer diameter of the standard split-spoon (SS) sampler in mm 3o.2 (0 Area ratio of the standard split-spoon (SS) sampler-D: 6) Isom 10 0 too 35 y

Explanation / Answer

5. a) true - there is no such rule
b)Rotary drilling
c)Wash boaring
d)True
e)True
f) False

6. c.
Sampler is driven into the soil of 450 mm and blows for every 150 mm penetration is counted.
but last two value, that is no of blow for last 300 mm is taken as N value.
first 150 mm is called seating drive.

Thank you

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