I whle drilling a well a rock layer Is encountered at 10000 ft. depth with an excess pressure (overpressure) of 150 psl. An overpressure zone has fluld pressures In excess of the hydrostati gradlent. If the overburden densfty Is 2400 kg/m" and the fluld column Is water what Is the effectIve stress at this depth? 5921.17 psl 57.68 MPa 4127.6psl 5549.0psl

i. The following information is collected from rock coring process in which the total core advance was 65 cm. Core Recovery (cm) 20 7 Calculate: 11. a) The total core recovery b) The core recovery ratio c) The rock quality designation d) State the rock mass quality 6 10 16 A shear vane of length 150 mm and diameter 50 mm was used to measure the shear strength of saturated clay. The torque required at failure of the clay was 50 N-m. a) Assuming a triangular stress distribution along the vane ends, estimate the shear strength of the clay in kPa. b) On this clay, how deep can excavation advance without lateral support? Assume y= 18 kN/m³.

Y=15kN/m²³ Y=12.5 kN/m³ 0 p = 150 kPa e₁ = 0.95 KON.C.=0.57 m = 0.4 Y = 27.5 kN/m³ sand 9m Clay [ Bedrock * ↑ 3m ↓ 18m 5m ↓↓↓ A) What is the total vertical stress, o (in kPa) at the mid point of the clay layer? B) What is the pore water pressure, u linkPa) at the midpoint of the clay layer? c) What is the effective vertical Stress, o'v (in kPa) at the midpoint of the clay layer D) What is the over consolidated Ratio (OCR) at the midpoint of the clay layer? E) What is the total horizontal Stress (inkPa) at the midpoint of the clay layer?

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