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Cpt Parameter Derivation

Derives geotechnical design parameters from cone penetration test (CPTu) data using the Robertson (1990) classification framework. Computes corrected cone resistance qt, normalized parameters Qt and Fr, soil behavior type index Ic, and estimates undrained shear strength (via Nkt) for clay-like soils or friction angle for sand-like soils based on the Ic = 2.6 boundary.

inputs

7 fields

context

4 archetypes

engine

with-tool

outputs

7 scored fields

contract fields

Parameter Map

7 inputs to 7 scored outputs

  • qc_mpa

    float

    Measured cone resistance

    0.2 to 40MPa

  • fs_kpa

    float

    Measured sleeve friction

    1 to 500kPa

  • u2_kpa

    float

    Measured pore water pressure at cone shoulder

    -50 to 1500kPa

  • depth_m

    float

    Test depth below ground surface

    1 to 40m

  • total_unit_weight_kn_m3

    floatfrom archetypehidden in hard

    Total unit weight of soil

    14 to 22kN/m³

  • water_table_depth_m

    floatoptional

    Depth to water table below ground surface

    0 to 50m

  • net_area_ratio

    floatoptionalhidden in hard

    Net area ratio of the cone (a)

    0.55 to 0.85-
qt_mpatol 0.03

Corrected cone resistance qt (MPa)

friction_ratio_pcttol 0.05

Friction ratio Rf (%)

qt_normtol 0.05

Normalized cone resistance Qt

fr_normtol 0.05

Normalized friction ratio Fr (%)

ictol 0.05

Soil behavior type index Ic (Robertson 1990)

su_kpatol 0.05

Estimated undrained shear strength Su (kPa), 0 if sand-like

phi_degtol 0.05

Estimated friction angle phi' (degrees), 0 if clay-like

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, soft clay or medium sand archetypes

all fields visible
all_givenmedium

All parameters given, any soil archetype

all fields visible
partialhard

Unit weight and net area ratio hidden, agent infers from context

total_unit_weight_kn_m3net_area_ratio

scenario bands

Archetype Atlas

soft_clay

3 contexts

Soft normally consolidated clay with high pore pressure

qc_mpa0.2 to 1.5
fs_kpa5 to 30
u2_kpa100 to 800
depth_m3 to 15

brisbane-alluvial / darwin-estuarine / cairns-coastal

stiff_clay

3 contexts

Stiff overconsolidated clay

qc_mpa1.5 to 5
fs_kpa30 to 150
u2_kpa50 to 500
depth_m3 to 20

sydney-shale / melbourne-basalt / adelaide-stiff

medium_sand

3 contexts

Medium dense clean sand

qc_mpa5 to 20
fs_kpa20 to 100
u2_kpa-20 to 50
depth_m2 to 20

perth-coastal / gold-coast-dune / newcastle-sand

dense_sand

3 contexts

Dense to very dense sand or gravel

qc_mpa15 to 40
fs_kpa50 to 300
u2_kpa-50 to 20
depth_m5 to 30

hunter-valley-alluvial / perth-limestone / sydney-hawkesbury

rendered task

Generation Preview

brisbane-alluvial-soft-clay-preview

difficulty
hard
visibility
partial
archetype
soft_clay
site context
brisbane-alluvial
instruction excerptcpt-parameter-derivation_calc.py

visible fields

  • qc_mpa0.2 to 1.5 MPa
  • fs_kpa5 to 30 kPa
  • u2_kpa100 to 800 kPa
  • depth_m3 to 15 m
  • water_table_depth_m0 to 2 m

withheld schema

net_area_ratiototal_unit_weight_kn_m3qt_mpafriction_ratio_pctqt_normfr_normicsu_kpaphi_deg
Soft normally consolidated clay with high pore pressure. brisbane-alluvial. Required outputs: qt_mpa, friction_ratio_pct, qt_norm, fr_norm, ic, su_kpa