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Spt Corrections

Applies standard corrections to raw SPT blow counts following the Liao and Whitman (1986) procedure per ASTM D1586 practice. Applies energy (CE), borehole diameter (CB), sampler (CS), and rod length (CR) corrections to obtain N60, then normalizes to a reference overburden pressure of 100 kPa using CN = sqrt(Pa/sigma'v) to produce the corrected (N1)60 value for liquefaction and strength correlations.

inputs

6 fields

context

3 archetypes

engine

with-tool

outputs

7 scored fields

contract fields

Parameter Map

6 inputs to 7 scored outputs

  • raw_n_value

    int

    Raw field-measured SPT blow count

    5 to 60

  • effective_overburden_kpa

    float

    Effective overburden stress at test depth

    10 to 400kPa

  • hammer_type

    enumhidden in hard

    SPT hammer type

    autosafetydonut

  • borehole_diameter_mm

    enumhidden in hard

    Borehole diameter

    65115150200

  • sampler_type

    enumhidden in hard

    Sampler liner configuration

    with_linerwithout_liner

  • rod_length_m

    float

    Total rod length from surface to sampler

    3 to 30m
cetol 0.01

Energy correction factor CE

cbtol 0.01

Borehole diameter correction factor CB

cstol 0.01

Sampler correction factor CS

crtol 0.01

Rod length correction factor CR

n60tol 0.03

Energy-corrected N-value N60

cntol 0.03

Overburden correction factor CN

n1_60tol 0.03

Normalised corrected N-value (N1)60

visibility contract

Difficulty Ladder

all_giveneasy

Standard auto hammer, standard borehole, all params given

all fields visible
all_givenmedium

Any equipment combination, all params given

all fields visible
partialhard

Equipment parameters hidden, agent infers from context

hammer_typesampler_typeborehole_diameter_mm

scenario bands

Archetype Atlas

shallow_loose

2 contexts

Shallow test in loose material

raw_n_value5 to 15
effective_overburden_kpa20 to 80
rod_length_m3 to 6

brisbane-alluvial / darwin-estuarine

medium_depth

3 contexts

Typical mid-depth test

raw_n_value15 to 30
effective_overburden_kpa80 to 200
rod_length_m6 to 15

sydney-hawkesbury / melbourne-basalt / hunter-valley-alluvial

deep_dense

3 contexts

Deep test in dense stratum

raw_n_value30 to 50
effective_overburden_kpa200 to 400
rod_length_m15 to 30

perth-coastal / adelaide-stiff / cairns-coral

rendered task

Generation Preview

brisbane-alluvial-shallow-loose-preview

difficulty
hard
visibility
partial
archetype
shallow_loose
site context
brisbane-alluvial
instruction excerptspt-corrections_calc.py

visible fields

  • raw_n_value5 to 15
  • effective_overburden_kpa20 to 80 kPa
  • rod_length_m3 to 6 m

withheld schema

hammer_typesampler_typeborehole_diameter_mmcecbcscrn60cnn1_60
Shallow test in loose material. brisbane-alluvial. Required outputs: ce, cb, cs, cr, n60, cn