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built templateretaining-wallswith-tool

Wall Overturning

Evaluates overturning stability of cantilever retaining walls by computing the factor of safety as the ratio of resisting to overturning moments about the wall toe. Uses Rankine active earth pressure (Ka) to determine lateral forces from backfill and surcharge, and sums stabilising moments from the self-weight of the stem, base slab, and backfill soil per AS 4678 and Eurocode 7.

inputs

9 fields

context

4 archetypes

engine

with-tool

outputs

5 scored fields

contract fields

Parameter Map

9 inputs to 5 scored outputs

  • wall_height_m

    float

    Height of the wall stem above the base slab

    2 to 10m

  • base_width_m

    float

    Total width of the base slab

    1.5 to 8m

  • stem_thickness_m

    float

    Thickness of the wall stem

    0.2 to 1m

  • base_thickness_m

    float

    Thickness of the base slab

    0.3 to 1.2m

  • backfill_friction_angle_deg

    floatfrom archetypehidden in hard

    Effective friction angle of the backfill soil

    20 to 45degrees

  • backfill_unit_weight_kn_m3

    floatfrom archetypehidden in hard

    Unit weight of the backfill soil

    15 to 22kN/m³

  • concrete_unit_weight_kn_m3

    float

    Unit weight of the reinforced concrete

    23 to 25kN/m³

  • surcharge_kpa

    floatoptional

    Uniform surcharge load on the backfill surface

    0 to 30kPa

  • water_table_depth_m

    floatoptional

    Depth to water table from the top of the wall

    0 to 20m
katol 0.03

Rankine active earth pressure coefficient Ka

active_force_kn_mtol 0.05

Total active force per metre of wall Pa (kN/m)

overturning_moment_knm_mtol 0.05

Overturning moment about the toe Mo (kNm/m)

resisting_moment_knm_mtol 0.05

Resisting moment about the toe Mr (kNm/m)

factor_of_safety_overturningtol 0.05

Factor of safety against overturning FoS

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, no surcharge, no water table

all fields visible
all_givenmedium

All parameters given, surcharge and water table present

all fields visible
partialhard

Soil parameters hidden, surcharge and water table present

backfill_friction_angle_degbackfill_unit_weight_kn_m3

scenario bands

Archetype Atlas

loose_granular_fill

2 contexts

Loose granular fill

backfill_friction_angle_deg25 to 30
backfill_unit_weight_kn_m316 to 18

brisbane-alluvial / darwin-reclaimed

medium_dense_sand

2 contexts

Medium dense sand backfill

backfill_friction_angle_deg30 to 36
backfill_unit_weight_kn_m317 to 19

perth-coastal / hunter-valley-alluvial

dense_gravel

2 contexts

Dense compacted gravel

backfill_friction_angle_deg35 to 42
backfill_unit_weight_kn_m319 to 22

sydney-hawkesbury / melbourne-basalt

stiff_clay_fill

2 contexts

Stiff clay fill

backfill_friction_angle_deg20 to 28
backfill_unit_weight_kn_m317 to 20

adelaide-stiff / canberra-residual

rendered task

Generation Preview

brisbane-alluvial-loose-granular-fill-preview

difficulty
hard
visibility
partial
archetype
loose_granular_fill
site context
brisbane-alluvial
instruction excerptwall-overturning_calc.py

visible fields

  • wall_height_m2 to 10 m
  • base_width_m1.5 to 8 m
  • stem_thickness_m0.2 to 1 m
  • base_thickness_m0.3 to 1.2 m
  • concrete_unit_weight_kn_m323 to 25 kN/m³
  • surcharge_kpa0 kPa
  • water_table_depth_m20 m

withheld schema

backfill_friction_angle_degbackfill_unit_weight_kn_m3kaactive_force_kn_moverturning_moment_knm_mresisting_moment_knm_mfactor_of_safety_overturning
Loose granular fill. brisbane-alluvial. Required outputs: ka, active_force_kn_m, overturning_moment_knm_m, resisting_moment_knm_m, factor_of_safety_overturning