Consider a soil element which was originally embedded at a depth of 10 m below ground. The effective unit weight of the soil is 20 kN/m³, whilst the water table is far below the ground surface. The ground was subjected to weathering and erosion over the past 1 million years. The soil element is currently overlying by 2 m of soil only. Calculate the current over-consolidation ratio (OCR) of the soil element. The soil element was used to carry out a drained direct shear box test. The direct shear box apparatus had a plan area of 0.1m x 0.1m. A vertical load of 100 kg was subsequently applied to the soil. The critical state shear force was measured as 560 N. Calculate the critical state friction angle of the soil element. If the soil element is taken to carry out a drained direct shear box test at a mean confining stress of 20 kPa, calculate the OCR and critical state shear strength. If the soil element is taken to carry out a drained direct shear box test at a mean confining stress of 500 kPa, calculate the OCR and critical state shear strength.
Consider a soil element which was originally embedded at a depth of 10 m below ground. The effective unit weight of the soil is 20 kN/m³, whilst the water table is far below the ground surface. The ground was subjected to weathering and erosion over the past 1 million years. The soil element is currently overlying by 2 m of soil only. Calculate the current over-consolidation ratio (OCR) of the soil element. The soil element was used to carry out a drained direct shear box test. The direct shear box apparatus had a plan area of 0.1m x 0.1m. A vertical load of 100 kg was subsequently applied to the soil. The critical state shear force was measured as 560 N. Calculate the critical state friction angle of the soil element. If the soil element is taken to carry out a drained direct shear box test at a mean confining stress of 20 kPa, calculate the OCR and critical state shear strength. If the soil element is taken to carry out a drained direct shear box test at a mean confining stress of 500 kPa, calculate the OCR and critical state shear strength.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Question 3
Consider a soil element which was originally embedded at a depth of 10 m below ground. The
effective unit weight of the soil is 20 kN/m³, whilst the water table is far below the ground
surface. The ground was subjected to weathering and erosion over the past 1 million years. The
soil element is currently overlying by 2 m of soil only.
Calculate the current over-consolidation ratio (OCR) of the soil element.
The soil element was used to carry out a drained direct shear box test. The direct shear
box apparatus had a plan area of 0.1m x 0.1m. A vertical load of 100 kg was subsequently
applied to the soil. The critical state shear force was measured as 560 N. Calculate the
critical state friction angle of the soil element.
If the soil element is taken to carry out a drained direct shear box test at a mean confining
stress of 20 kPa, calculate the OCR and critical state shear strength.
If the soil element is taken to carry out a drained direct shear box test at a mean confining
stress of 500 kPa, calculate the OCR and critical state shear strength.
Sketch the shear stress-displacement curves for parts (c) and (d).
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