Avocet Pde OPW - App E Slope · OPW20/0092

PRACTICE NOTE GUIDELINES FOR LANDSLIDE RISK MANAGEMENT 2007

APPENDIX G - SOME GUIDELINES FOR HILLSIDE CONSTRUCTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GOOD ENGINEERING PRACTICE POOR ENGINEERING PRACTICE
ADVICE
GEOTECHNICAL Obtain advice from 2 quabfied experianced geotechnical practioner at early | Prepare detailed plan and start vite works before
ASSESSMENT stage of planing and before ws works. geotechnical adrice
PLANNING
SITE PLANNING Having obnmed advice, plan the development with ths nak | Plan development without rosard for the Risk
ising from the identified harards and consequences in mind
DESIGN AND CONSTRUCTION
Use flexible stuctmes which incorporam property desimed brickwork, timber | Fleer plans which require extents coming and
HOUSE DESIGN or steel frames, umber or pamel cladding i
Consider use of split levels. Movement intolerant suctares.
Use decks for recreational areas where sppropciste.
SITE CLEARING ee Tndtecrminately clear the site.
ACCESS = ‘beuow for cut, Ds, recaumng walls anc dramage. Excavate and £0 for site access beiore
DRIVEWAYS Goal apecihcateas Sc pais anty ened we toneaiied gectechnical advice
Drivewsys and wom cary Deed to be fully supported on pears.
EARTHWORKS Rewin netral coutour wherever possible. Tadescriminatory balk saxthworks.
Septh. ‘Large scale cuts and benching.
Cots a ee eee Unseppored cats
‘Mimumise baight Loose or poorly compacted £0 wiach ifit Subs,
Strip vegemtion and topsoil and key into natural slopes price to filling may flow a considerable Gctamcs incindas
‘Uve clean SIL carecials and compact to expoeenng smadards. onto below.
Fis Barat to spprogeias wope or support with engmmedred retaining wall Bloch samral drainage lines
Tecinds stumps, trees, vegetation, topsod,
boulders, brelding rubble otc im SE
Racy, Ouicrcrs Remove ox stabilise boulder: which may ave macceptable nuk Disturb ct undeccot detached blocks or
& Bou sexs Support rock Sces where necessary boulders.
desis to resist applied sod and water forces. Constract a structerally inadequate wall wach as
RETADNING Found cn rock where practicable. sandstone «flagsing brick oo =mremiorced
WALLS Provide subsurface draimags within wall backSill and surface draimags om shops | blockwork.
- shove Lack of subsurdace drains and weepbolss
Constract wall a5 s00n 35 possible after cut/Sl! operation.
Found withm rock where “Found om topscal, Toow SIL demched Sonidars
FOOTINGS ‘Use roms of piers or strip footings arented =p and down slope. or undercet cif.
Design for lacaral cosp pressures if necossary.
Back footing excavations to exclude ingress of surface water.
Support on piers to rock where practicable.
Design for high sod] pressures ae develop on aphall cide wicket thare
aaphs aseae Eeatenena enon
DRAINAGE
Provide at tops of cut and fill slopes. Discharge at top of Sik and cuts.
Descharge to stect drainage of nataral water courses. Allow weter to pond on bench areas.
Sumacn Provide general falls to prevent bicckage by siltation and incorporate silt traps.
‘Lins to mininess mGltraton and maks flauble wher posible
—__ Special souctures to dissipate anergy 21 changes of slope andor direction.
Provide filter around sebsurface drain. Discharge roof runof inte abscrpnom mmmches.
RNIN Provide drain bebind retaining vals,
‘Use flexible papslines with access for maintenance.
Prevent inflow of surface water.
Sure ‘Oseally requires pump-out or mums semer systeas, absorpoce menches may | Discharge Groctly caro and aso slopes.
ee be possible m scans areas if mak is acceptable. Use absorpeion tranche: wi consderica
a Storage tanks thomld be water-tight and adeqeamly founded of tandilide risk.
EROSION Control erosion as this my lead to mstabiliry. Faire to cbhsare cathwork: and dame
CONTROL & Ene cleared area Teccommandanon: when
ms eects sesepoa
DRAWINGS AND SITE VISITS DURING CONSTRUCTION
DRAWINGS Application dawmas should bs viewed by aectechmical comsnizant
SITE VISITS Sits Visits by consultant may be appropnate during constuction
INSPECTION AND MAINTENANCE BY OWNER
OWNER'S Clean cratmage sytem: reper broken join = dram and leaks in supply
RESPONSIBILITY | pipes.
Where stmcteral distress is ovidant sos advice.
E seepage observed determine cme: or soak advice on consequences

 

 

 

 

Australian Geomechanics Vol 42 No 1 March 2007