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TERMINOLOGY

AUSTRALIAN GEOGUIDE LR1 (INTRODUCTION)

Terminology tends to change with time and place and with the context in which it is used. The terms listed below have
the following meanings in the GeoGuides:

 

 

 

Consequence the outcome, or potential outcome. arising from the occurrence of a landslide expressed quantitatively, or
qualitatively, In terms of loss, disadvantage, damage. injury, of 105s of life.

Discontinuny in relation to the ground is a crack, 2 bedding plane {a DoUndary Delween siraa) of taunt (a plane along
which the ground has smeared) which forms a plane of weakness and reduces the overall strength of the
ground.

Equiiprium the condition when the forces on a mass of soll or rock in the ground, or on a retaining structure, are equat

and opposite.

 

Factor of safety (FOS)

theoreticaly Me forces avalable to prevent a part of Me ground, of a reaming structure, trom moving
divided by those trying to move It A FOS of one or less Indicates that failure Is likely to occur, but not how
likely It i. To allow for unknowns and to limit movements engineers always am to achieve a FOS
significantly larger than one.

 

Failure

 

when part of the ground experiences movement a5 2 result of the out of balance forces on It Fafure of a
retaining structure means It is no longer adie to full fs intended function.

 

Genechnical practivoner

when referred to In the Australian GeoGuides (LR series), Is a professional geciecnnka engineer, or
engineering geotogist, with chartered status in a ed national professional Institution and relevant
training, experience and core competencies im landslide risk assessment and management In some
government departments, technical officers are specticaily trained to undertake some of the functions of a
geotechnical practitioner.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hazard 3 condition wih the potentiat for causing an undesirable consequence. in relation to landslices ths
includes the location, size, speed, distance of travel and the Mkellhood of fs occurrence within a given
period of time.

Landside the movement or the potential movement, of a mass of rock, debris. or earth down a siope.

Likeinood a guaitiative Description of prooapill ty. or trequenc’ ry, Of Occurrence.

Partial saturation the condRion In the ground above the water table where ooth alr and water are present as well as soll, or
Tock.

Perched water tare 3 wale table above ihe irue waler table suppomed by 3 low permeability stratum.

Permeabulty a measure of the abliky of ihe ground to alow water to flow through It

Risk a measure of the probability and severity of an adverse effect to life. health, propery or ihe environment

Sip faliure landslide.

Staole the condition when fafure wil not occur. Over geotogical time no pan of the ground can be considered
stable. Over short periods (eq the Ife of a structure} stabilty Imples a very low fitellhoos of tabure.

Retaning siucture anything bulit by humans which is Mtended fo suppor the ground and inhibit tabure

Structure in relation to rock, of Sol, means the spacing, extent, orlentaton and type o discontinuites found In ihe
ground 3t 3 particutar location.

Tension crack ‘a distinct open crack that normally Gevelops in the ground around a landside and indicaies actual, or
imminert , failure.

Water table the level in he Ground below which Ais saturated and ine volds are filed with water.

 

 

 

 

Australian Geomechanics Vol 42 No 1 March 2007

161