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Lateral Earth Pressure

Calculates active and passive earth pressure coefficients and resultant forces on retaining walls using Rankine theory per AS 4678. Handles two-zone pressure distribution when a water table is present, computing effective earth pressure above and below the water table plus hydrostatic thrust. Outputs include Ka, Kp, active and passive forces, overturning moment, and water force per unit wall length for stability assessment.

inputs

7 fields

context

5 archetypes

engine

with-tool

outputs

6 scored fields

contract fields

Parameter Map

7 inputs to 6 scored outputs

  • wall_height_m

    float

    Retaining wall height H

    1 to 12m

  • friction_angle_deg

    floatfrom archetypehidden in hard

    Effective friction angle of backfill soil phi'

    15 to 45degrees

  • cohesion_kpa

    floatoptionalfrom archetype

    Effective cohesion of backfill soil c'

    0 to 50kPa

  • unit_weight_kn_m3

    floatfrom archetypehidden in hard

    Total (bulk) unit weight of backfill soil gamma

    15 to 22kN/m3

  • surcharge_kpa

    floatoptional

    Uniform surcharge pressure on the backfill surface q

    0 to 30kPa

  • water_table_depth_m

    float

    Depth from ground surface to the water table behind the wall (equal to wall height means no water)

    0 to 12m

  • backfill_slope_deg

    floatoptional

    Backfill slope angle beta above horizontal

    0 to 25degrees
katol 0.03

Active earth pressure coefficient Ka (dimensionless)

kptol 0.03

Passive earth pressure coefficient Kp (dimensionless)

active_force_kn_per_mtol 0.03

Total active earth pressure force per unit wall length Pa (kN/m)

passive_force_kn_per_mtol 0.03

Total passive earth pressure force per unit wall length Pp (kN/m)

active_moment_knm_per_mtol 0.03

Active overturning moment about the wall base Ma (kNm/m)

water_force_kn_per_mtol 0.03

Hydrostatic water force per unit wall length Pw (kN/m)

visibility contract

Difficulty Ladder

all_giveneasy

Cohesionless sand, no water table, no surcharge, horizontal backfill

all fields visible
all_givenmedium

Surcharge and cohesion may be present, horizontal or sloping backfill, no water

all fields visible
partialhard

Water table present, some soil parameters hidden; agent infers from site context

friction_angle_degunit_weight_kn_m3

scenario bands

Archetype Atlas

loose_sand_dry

2 contexts

Loose sand backfill, no water table

friction_angle_deg28 to 32
cohesion_kpa0
unit_weight_kn_m316 to 18
water_table_depth_m12

perth-coastal-retaining-wall / gold-coast-canal-wall

medium_dense_sand_dry

2 contexts

Medium dense sand backfill, no water table

friction_angle_deg32 to 36
cohesion_kpa0
unit_weight_kn_m318 to 20
water_table_depth_m12

sydney-harbour-foreshore-wall / brisbane-river-terrace

dense_gravel_fill

2 contexts

Dense gravel fill behind a cantilever wall

friction_angle_deg36 to 42
cohesion_kpa0
unit_weight_kn_m319 to 21
water_table_depth_m12

adelaide-quarry-haul-road / cairns-port-wharf-wall

silty_sand_with_water

2 contexts

Silty sand backfill with elevated water table

friction_angle_deg28 to 34
cohesion_kpa0 to 5
unit_weight_kn_m318 to 20
water_table_depth_m1 to 4

darwin-stormwater-channel-wall / townsville-coastal-revetment

stiff_clay_fill

2 contexts

Stiff clay backfill behind a gravity wall

friction_angle_deg20 to 28
cohesion_kpa10 to 40
unit_weight_kn_m318 to 21
water_table_depth_m12

melbourne-basalt-clay-wall / canberra-substation-retaining

rendered task

Generation Preview

darwin-stormwater-channel-wall-silty-sand-with-water-preview

difficulty
hard
visibility
partial
archetype
silty_sand_with_water
site context
darwin-stormwater-channel-wall
instruction excerptlateral-earth-pressure_calc.py

visible fields

  • wall_height_m1 to 12 m
  • cohesion_kpa0 to 5 kPa
  • surcharge_kpa0 kPa
  • water_table_depth_m1 to 4 m
  • backfill_slope_deg0 degrees

withheld schema

friction_angle_degunit_weight_kn_m3kakpactive_force_kn_per_mpassive_force_kn_per_mactive_moment_knm_per_mwater_force_kn_per_m
Silty sand backfill with elevated water table. darwin-stormwater-channel-wall. Required outputs: ka, kp, active_force_kn_per_m, passive_force_kn_per_m, active_moment_knm_per_m, water_force_kn_per_m