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Immediate Settlement

Calculates the elastic (immediate) settlement of shallow foundations using the Boussinesq equation Si = q*B*(1-nu^2)/E * If, where the influence factor If depends on footing shape and L/B ratio per Bowles (1996) Table 5-6. Supports square, rectangular, and circular footings with flexible or rigid foundation corrections for settlement prediction in granular and stiff cohesive soils.

inputs

7 fields

context

4 archetypes

engine

with-tool

outputs

2 scored fields

contract fields

Parameter Map

7 inputs to 2 scored outputs

  • applied_pressure_kpa

    float

    Net applied foundation pressure q

    25 to 500kPa

  • footing_width_m

    float

    Footing width B (shorter dimension)

    0.5 to 10m

  • footing_length_m

    float

    Footing length L (longer dimension, L >= B)

    0.5 to 30m

  • elastic_modulus_mpa

    floatfrom archetypehidden in hard

    Soil elastic modulus E

    2 to 200MPa

  • poisson_ratio

    floatfrom archetypehidden in hard

    Soil Poisson's ratio nu

    0.15 to 0.49

  • footing_shape

    enum

    Footing shape

    squarerectangularcircular

  • foundation_rigidity

    enum

    Foundation rigidity

    flexiblerigid
influence_factortol 0.05

Settlement influence factor I_f

settlement_mmtol 0.03

Immediate elastic settlement Si (mm)

visibility contract

Difficulty Ladder

all_giveneasy

Square flexible footing, all parameters given

all fields visible
all_givenmedium

Any shape and rigidity, all parameters given

all fields visible
partialhard

Soil properties hidden, agent must estimate E and nu from site description

elastic_modulus_mpapoisson_ratio

scenario bands

Archetype Atlas

loose_sand

2 contexts

Loose to medium sand

elastic_modulus_mpa10 to 30
poisson_ratio0.25 to 0.35

perth-coastal / gold-coast-sand

dense_sand

2 contexts

Dense sand and gravel

elastic_modulus_mpa40 to 80
poisson_ratio0.3 to 0.4

hunter-valley-alluvial / newcastle-fill

stiff_clay

3 contexts

Stiff overconsolidated clay

elastic_modulus_mpa15 to 50
poisson_ratio0.35 to 0.45

sydney-hawkesbury / melbourne-basalt / adelaide-stiff

soft_clay

2 contexts

Soft normally consolidated clay

elastic_modulus_mpa2 to 10
poisson_ratio0.4 to 0.48

brisbane-alluvial / darwin-estuarine

rendered task

Generation Preview

perth-coastal-loose-sand-preview

difficulty
hard
visibility
partial
archetype
loose_sand
site context
perth-coastal
instruction excerptimmediate-settlement_calc.py

visible fields

  • applied_pressure_kpa25 to 500 kPa
  • footing_width_m0.5 to 10 m
  • footing_length_m0.5 to 30 m
  • footing_shapesquare
  • foundation_rigidityflexible

withheld schema

elastic_modulus_mpapoisson_ratioinfluence_factorsettlement_mm
Loose to medium sand. perth-coastal. Required outputs: influence_factor, settlement_mm