Negotiated - Compiled Reference Document - RAL25 0011 (As Published)

AUSTRALIAN GEOGUIDE LR8 (CONSTRUCTION PRACTICE)
EXAMPLES OF POOR HILLSIDE CONSTRUCTION PRACTICE

Unstabilised rock topples and travels downslope

Vegetation removed

Steep unsupported cut faits \

Discharges of roofwater soak away rather than

conducted offsite or to secure storage for re-use

Structure unable to tolerate
settlement and cracks

Poorly compacted fil sates

unevenly and cracks poo! f?

 
 
  
 
  
 
  
  
  
 

 

Inedequele weling unetie iV
to support fil -
Roofwater introduced
~ Dwelling not founded in
Vegetation
removed
‘Absence of subsoil drainage
Mud flow
occurs:
+ Loose, saturated fil slides and
. = possibly flows downslope
4 = Ponded water enters slope and activates landslide et
= - Possible travel downslope which impacts other development dawntill hes eoiho psa!

WHY ARE THESE PRACTICES POOR?

Roadways and parking areas - are unsurfaced and lack proper table drains (gutters) causing surface water to pond and
‘soak into the ground.

Cut and fill - has been used to balance earthworks quantities and level the site leaving unstable cut faces and added
large surface loads to the ground. Failure to compact the fill properly has led to settlement, which will probably continue
for several years after completion. The house and pool have been built on the fill and have settled with it and cracked.
Leakage from the cracked pool and the applied surface loads from the fill have combined to cause landslides.

Retaining walls - have been avoided, to minimise cost, and hand placed rock walls used instead. Without applying
engineering design principles, the walls have failed to provide the required support to the ground and have failed,
creating a very dangerous situation.
A heavy, rigid, house - has been built on shallow, conventional, footings. Not only has the brickwork cracked because
of the resulting ground movements, but it has also become involved in a man-made landslide.
Soak-away drainage - has been used for sewage and surface water run-off from roofs and pavements. This water
soaks into the ground and raises the water table (GeoGuide LR5). Subsoil drains that run along the contours should be
avoided for the same reason. If felt necessary, subsoil drains should run steeply downhill in a chevron, or herring bone,
pattern. This may conflict with the requirements for effluent and surface water disposal (GeoGuide LR9) and if so, you
will need to seek professional advice.
Rock debris - from landslides higher up on the slope seems likely to pass through the site. Such locations are often
Teferred to by geotechnical practitioners as "debris flow paths". Rock is normally even denser than ordinary fill, so even
quite modest boulders are likely to weigh many tonnes and do a lot of damage once they start to roll. Boulders have
been known to travel hundreds of metres downhill leaving behind a trail of destruction.
Vegetation - has been completely cleared, leading to a possible rise in the water table and increased landslide risk
(GeoGuide LRS).

DON'T CUT CORNERS ON HILLSIDE SITES - OBTAIN ADVICE FROM A GEOTECHNICAL PRACTITIONER

More information relevant to your particular situation may be found in other Australian GeoGuides:

* GeoGuideLR1 - Introduction *  GeoGuide LR6 - Retaining Walls

« GeoGuideLR2 - Landslides «  GeoGuide LR7 - Landslide Risk

*  GeoGuide LR3  - Landslides in Soil * GeoGuide LR9 - Effluent & Surface Water Disposal
*  GeoGuide LR4 - Landslides in Rock GeoGuide LR10 - Coastal Landslides

+ _GeoGuide LR5 _- Water & Drainage * —GeoGuide LR11 - Record Keeping

 

The Australian GeoGuides (LR series) are a set of publications intentled for property owners; local councils; planning authorities;
developers; insurers; lawyers and, in facl, anyone who lives with, or has an interest in, a nalural or engineered slope, @ cutting, or an
excavation. They are intended (o help you understand why slopes and retaining structures can be a hazard and what can be done with
appropriate professional advice and local council approval (if required) to remove, reduce, or minimise the risk they represent. The
GeoGuides have been prepared by the Australian Geomechanics Sociely, a specialist technical society within Engineers Australia, the
national peak body for all engineering disciplines in Australia, whose members are professional geolechnical engineers and engineering
geologists with a particular interest in ground engineering. The GeoGuides have been funded under the Australian governments’
National Disaster Mitigation Program.

Australian Geomechanics Vol 42 No 1 March 2007 175