Appendix4-SlopeStabilityAssessment · MCU18/0135

 

 

Foundation Maintenance _(()
and Footing Performance:  *~,.
A Homeowner's Guide =

Buildings can and often do move, This movement con be up, down, loteral or rotational. The fundamental couse
of movement in buildings can usually be related to one of more problems in the foundation soil, It is important for
She hesoerenener ip Wasa D0 Sel ype bn-soder So enemies Bex soeioerss Oot Healt be aol te giee inorder
ensure that problems in the foundation soil con be prevented, thus protecting ogainst building movement.

This Building Technology File is designed to couses of soilveloted building movement, and to suggest
pore wpe Dene et pear regs Fr

s

Soil Types Lronon

_— AB wails ae prome 0 eromon, but sandy onl is purticularly meceptible
‘The rypes of soils umaully presens under the copsed! im land zoned for saiikagsetbed aimee Wiser ag abv tak socoaanet GEG UN

can be split inne two - or more can naffer from enonion.

iene, eee ee Sicitca
consent ae exually caused by erosion. Clay sou are te ‘This ix a problem in clay soils. Saturation creates a beg:
sttetanion and vwelishrunk problems Lake suspenmon Lebar thoargetahy he baar ren lortab
Clasifications for 4 given ates can generally be cbtaioed by Sct eianien ee ee
sppbcation to the lexal ys bat there ate seenctimes unertabbe . 7 sand fill for oat
FE eT Ea beeen ie eta ey Sees aa 4 Arar yal
sa hn a np danificetion em scnding te sauialiy be the poortnce of the baiides
aenount Weinkage they expenence with varuseed Seasonal welling
water consent. The table below is Table 2.1 from AS 2870, the a ee a ee aad. baking
Residential Stab and Footing Coube. the sol incteawe so (ese te. The ep: of tee
‘ wanes bereven different clays, x does the degree of
[Castes of Murenent deren ding te abequet deying ou cued by bt weather
sme dat in cata plan abe arog

ane peo types of sectlement that occur as a reali of tainy 01 dry periods, uneilly of weeks o« months,
ee cae fre hang ete spor frome tar

* Immediate sertement ccoun when « budding i few placed oo int :
foumdatioe sod, as » eeuult of compaction of the seal under the ‘The pwelling of soil coeaes an upward force om the foocings of the

weight of che wrucreee, The cobeseve qualicy of clay soll teahding atl shrinkage conates mubenbence chat cokes the
wee So te ponte quanto ea oe, c siuet aly Ga keabyimeeagliabens
* Consolidation sectiement is « fearure of clay soil and may take

Drecause of the expulior of moieure from the wil of becase — Shear failure
Paani kot teens hank comentneraan mene This phenomeace occurs when the foundation soil doce aot bere

 

 

 

 

 

 

Highly reactive clay ears, whach cam experience high ground movement from mourure changer
Eaneemedy reactive wes, which can experience extreme ground movement from mounere changes
Aw? Filed sons

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SIRS 0 ely es ples age St int test lie sulBicaret strength to support the wright of the footing. There see
commmuction, but has knows co take many yeary in two majer pow-conmruction causes
exceptional cases. * Significant load increse.
‘These problems ase the peovince of the beilder and should be ales * Reduction of Laseral support of the sell wecder the footing dae
into comaiderstion at part of the of the sive fot Comune tress of excavation.
thom. Building File 1 19) heals with tbsewe © be clay soil, sheae failure com be caused by saturachon of the soil
peublern. adjacent to of wander the footing,
GENERAL DEFINITIONS OF SITE CLASSES
Os Foundation
A Mou and and tock wens with ede ot po proce movement from mouture changes
s Slightly reacure clay ware with colby algght ground minement (som mowcure chamyre
M Morderacety reactive clay or silt ene, whach can experience modersce ground movement fecwn trmmture Chionges
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