Expert-level geotechnical engineering covering soil classification, shear strength, consolidation, foundation design, slope stability, and retaining structures.
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USCS: unified soil classification system, grain size and plasticity-based. Grain size: gravel, sand, silt, clay based on particle size distribution. Atterberg limits: liquid limit, plastic limit, plasticity index for fine soils. Relative density: measure of sand compactness, Dr = e_max minus e over e_max minus e_min. Compaction: Proctor test determines optimal moisture content for maximum dry density.
Mohr-Coulomb: tau_f = c plus sigma prime tan phi, cohesion plus friction. Drained vs undrained: sand drains fast, clay drains slow under load. Effective stress: sigma prime = sigma minus u, pore pressure reduces effective stress. Triaxial test: measure shear strength at different confining pressures. SPT and CPT: in-situ tests correlate to strength and stiffness parameters.
Primary consolidation: volume change from pore pressure dissipation in clay. Terzaghi theory: cv dU over dz2 = dU over dt, diffusion of excess pore pressure. Settlement calculation: delta = Cc times H over 1 plus e0 times log sigma_f over sigma_0. Time rate: T_v = cv times t over H2, use time factor chart. Secondary compression: creep settlement after primary consolidation complete.
Bearing capacity: Terzaghi and Meyerhof equations for shallow foundations. Net bearing pressure: gross minus overburden pressure. Pile capacity: end bearing plus skin friction, static and dynamic methods. Group effects: pile group efficiency, settlement of pile groups. Mat foundation: uniform pressure distribution, used on weak or variable soils.
| Pitfall | Fix |
|---|---|
| Ignoring differential settlement | Check settlement variation across structure footprint |
| Wrong drainage condition for clay | Use undrained strength for short term, drained for long term |
| Underestimating secondary compression | Account for creep in organic soils and soft clays |
| Missing groundwater in slope stability | Pore pressure dramatically reduces factor of safety |
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