ewce09.azraftaohid.me/L3T2/EWCE 343/SA/Preparation Plan.md

Created: 2026/04/26 19:11

Quick revise checklist:

Lateral earth pressure

• Definitions: earth pressure at rest, active/passive earth pressure, coefficients
• Assumptions of Rankine's earth pressure theory
• Derive active/passive earth pressure coeff.
• Draw qualitative failure lines
• Equation of $k_a$, $k_p$ on cohesionless, inclined surface soil
• Derivation of ${\sigma }_3=k_a{\sigma }_1-2c\sqrt{k_a}$
• Theoretical unsupported height, $H_u=2h_c$
• Effect of stratification plus water table
• Eqn for effect of point load and strip load
• Assumptions of Coulomb's theory
• Justify Rankine's formula from Coulomb's formula for $k_a$ or $k_b$
• Coulomb's method

Subsurface exploration

• Two techniques of depth of boring
• Empirical equations for depth of boring
• Six methods of boring (name, applicability)
• Wash boring description
• All undisturbed soils are representative soil
• Soil samplers
• Three stages of sample disturbance
• Cutting edge, recovery ratio, rock quality designation
• SPT mechanisms
• Refusals
• Corrections
• Angle of internal friction of SPT N value
• CPT: friction ratio
• CPT: cone resistance from $N$ value
• Soil exploration report
• Boring log

Pile foundation

• Driven pile: cohesive soil (alpha method)
• Driven pile: cohesionless soil (beta method) (recognize that $f_s=\beta {\sigma }_{avg}$)
• Driven pile: c-phi soil (lambda method)
• Skin friction and end bearing for bored pile conversion
• Capacity based on SPT-N value
• Group piles: efficiency
• Group pile: block method