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| Mistake | Consequence | Solution | | :--- | :--- | :--- | | Ignoring water table | Underestimated uplift → cracked bottom slab | Always model buoyancy & hydrostatic load | | Using active earth pressure in rigid frames | Over-conservative? (Debated). Use at-rest (Ko) for taller boxes | Follow IRC:SP:13 – Use Ko for cast-in-situ | | Skipping corner reinforcement check | Premature hinge formation at joints | Design haunches and provide corner bars | | Not verifying crack width | Leakage & rebar corrosion | Apply limit state of serviceability | | PDF missing units/mixed units | Calculation errors | Enforce SI units consistently |
) are applied to the top slab. These loads disperse through the soil fill at a specific angle (often 45°) before reaching the structure. Lateral Earth Pressure
is the authoritative source for hydraulic design charts and nomographs. Federal Highway Administration (.gov) Key Design Parameters and Formulas