Question

CLASSIFICATION SHEAR STRENGTH LOCATION: See Plate 2 COORDINATES: N 29.499981 W 95.262789 Triaxial VaneMinisture VaneA SURFACE EL: No | |の KIPS PER SQ FT STRATUM DESCRIPTION 05 1.0 15 2.0 25 SILTY CLAY, firm to stiff, dark gray 25 39 13 26 with calcareous nodules, 2 to 6 gray and tan below3 stiff, with sand pockets and ferrous nodules below 22 55 12 43 20 109 8.0 SANDY SILT, medium dense, gray and tan with sand pockets and ferrous nodules to 10 10 12 56 12.5 tan 10 with clay seams to 14 15 10 20 31- dense, with day seams at 24 25 27.0 CLAY, very stiff, red 30 35 DATE: December 16, 2009 TOTAL DEPTH: 30 CAVED DEPTH: 9' DRY AUGER: Surface to 12 WET ROTARY: 12 to 25 BACKFILL: Cement-Bentonite Grout LOGGER: E. Schulak . Water First Noticed. X: Depth To Water after 20 minutes. 2. Terms and symbols defined on Plates 10a and 10b Figure la. Boring log for Problem 6

Answer 1

a. total depth of boring was 30 feet

b. wet rotary drilling method was used fron12' to 25'

c. thin walled sampler

d. Water was first noticed 12 feet below ground surface. After 20 minutes the water level was at 5 feet 6 inches below ground level.

e. Split tube sampler was used to collect sample at 24 feet.

N₆₀= Nx ER_r / 60 , for safety hammer ER_r / 60 = 0.92 and at 24 ft N = 31 BLOW PER feet

So N = 31X 2 = 62

Hence N₆₀= 62 x 0.92 = 5.704