Appendix4-SlopeStabilityAssessment · MCU18/0135

 

 

 

Tove root growth

Trees and whrube that are allowed wu ln the vicinity of fooeings

can cause foundstios vod seovernent 1h Two Wap

© Room thet crow weber footings may increase in crene-sectsonual
tite, exertang upreard premusce on foctang.

© Roor im che vicinity of foceings will aboorb euch of the moenare
iin the foundation soil, coating shrinkage of wubwidence.

Unevenness of Movement
The of ground movement des nhed shove oeet
to connraction tends to be aneven

© Diffceing compaction of foundstios il ptice to coneructine.

© Diffcring moinee content of founducon wil prior in coomtinaction.
Movemeas dar to pon-comittuction causes is usually more uneven
will. Erosion can undermine a thar trawenses the flow or can
create the conditions foe wbeat failure by erodeng woul adjacent so a
footing that fare ies the same direceiow as the Aerwe.

Seruration of day foundation wxl may occur where usbtloor wall
creete a dam chat males water pood. |e can sho occ wherever there
is a source of water near footings in clay x08 This leads wo a severe
seduction in the mrength of the soll which may crease local shear

Seasnaal nerilong sod. of clay soil aflec the perimeter of

re Sehoastuae Tanenling

So encber ade the od en nan
Swelling gradually the

intenoe wl at abaorpion cominucs Shnmkage wmually beguns where
the sun heat m greases.

| Effects of Uneven Soil Movement on Structures
Erosion and seturation
Erosion removes the from under footings tond.ag to covane
the structure ander which §

© Seep cracking ie the mortar beds im the of thee wealll of
above! below

openings each a door or
° : jg, in the bricks (usually but noe necessarily im lame
with the beds oF perpendi).
heotaned affecord by croson of eaturstion of foundation: will
cron nc ott mh he buen
fall over, floor that hawe lost this support will broome bouncy,
sedeecenes rattling o¢nament eu.

 

Effects om fall mascery strectures
teickwork will resiat cracking where @ can. bt will sempe to span
sites ae ele Wap betas oct eats or oe

pain. Tee tumaal to see cracking at weak pow, rach

Camphadalenetden. a
Ie the event of comcruction wetlement, cracking will ussally eemsin
unchanged afner the poocews of settlement has ceased.

tantil the
ha neutralised che affected portion of and the
ee athe eeeneee