Att 3 - Landslide Risk Assessment

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AWGEOTECHNICS

 

 

2. ENGINEERING

The engineer designs house footings to ensure
that they can cope with the soil and environmental
conditions assessed at the time of the site
investigation and perform to their design potential.

3. BUILDING

In the construction of a building the builder needs
to comply the Building Code of Australia, relevant
Australian Standards, engineering specifications
and contract documents. (Fig. 4) The following are
important aspects the builder will need to address:

*Builders should ensure that owners understand
that failure to maintain adequate drainage may
result in damage to the structure,

¢Well-drained foundation conditions, which will
create “normal” soil moisture and adequate
bearing capacity.

*Ensuring that excavations are well supported or
are dug to avoid collapses. (Fig. 11)

*Constructing well-compacted and retained ‘soil
aprons’ around the building to stop erosion.

*Special considerations if any excavations are to
be dug near adjoining structures.(Fig. 11)

*Sloping the soil and paths away from the
building by the minimum amount required by the
building regulations to prevent water flowing
towards the building foundations. (Fig. 10 & 18)

*Constructing soil drains or moisture barriers in
sloping sites to prevent stormwater adversely
affecting the building foundations.

*lIn highly or extremely reactive clay sites
Australian Standard 2870 — “Residential slabs
and footings" requires mechanical flexible
couplings for sub-surface drainage pipes and for
above-ground connections from the downpipe to
the storm water drains. These allow for the
movement of the soil and minimise the risk of
pipe joints breaking and creating leakage
problems. (Fig.6).

4. HOME OWNERS

The home owner should read and become familiar
with the Site Classification report provided prior to
construction and the type of footing system used
in the building. To comply with Australian
Standard 2870 — “Residential slabs and footings”,
and achieve acceptable performance and safety
during the design life of the house, the owners
shall maintain the garden and foundation soil
moistures, paving and drainage systems. (Fig. 7)

Failure to maintain the foundation conditions can
lead to cracking of walls and floors. Damage to a
building that can be attributed to actions of the
owner could diminish the builder's warranty
obligations, leaving the owner responsible for the
cost of repairs

 

Fig. 4

 

Houses to be constructed to the following:
* Building Code of Australia

* Australian Standards

* Engineers Design

Fig. 5 Well Drained Sites
Retaining Wal a

 

 

 

 

 

Fig.6 Mechanical Flexible Couplings to reduce the
potential of broken pipes in M/M-D, HI/HI-D,
H2/H2-D & E /E-D sites plus all clay based sites
with trees

~~ SS

    

Fig.7

 

HOME OWNERS RESPONSIBILITIES.

To maintain...

a PAVING
aH DRAINAGE SYSTEMS

FOUNDATIONS

 

 

 

 

Site Classification Report

 

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