Land Development Engineering

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  • 1.  Quality Assurance - Fill

    Posted 10-07-2015 15:46
    Hi all

    Was just wondering what everyone asks for in terms of quality assurance for earth fill?
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    Clare Hamilton
    Development Engineer
    Selwyn District Council
    Rolleston
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  • 2.  RE: Quality Assurance - Fill

    Posted 13-07-2015 16:52
    Hi Clare,

    We require the consultants to specify fill requirements on their general notes page on their detailed engineering (construction) plans, as follows:

    FILLING OF ALL PROPERTIES AND ROAD RESERVES MUST BE CARRIED OUT USING APPROVED FILL.  TOPSOIL AND ALL VEGETABLE MATTER MUST BE STRIPPED FROM THE SITE PRIOR TO FILLING.  ALL FILLING TO BE CARRIED OUT IN 150MM LAYERS AND COMPACTED TO 95% MAXIMUM DRY DENSITY TO COMPLY WITH AS3798-2007, SECTION 8.2, LEVEL 1 AND A FILL REPORT MUST BE PROVIDED FROM A NATA REGISTERED SOIL TESTING LABORATORY.

    Hope this helps.  If you need more info, you can contact me on 03 9742 0798 or email on Julian.farrugia@wyndham.vic.gov.au.

    Cheers,
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    Julian Farrugia
    Wyndham City Council
    WERRIBEE VIC
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  • 3.  RE: Quality Assurance - Fill

    Posted 13-07-2015 16:53
    Hi Clare,
    Do you want information on the material quality/properties or the placement and compaction?

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    Jeff Bell
    ACT Territory and Municipal Services
    CANBERRA ACT
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  • 4.  RE: Quality Assurance - Fill

    Posted 06-08-2015 09:40

    Hi Jeff

    More in terms of placement and compaction.
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    Clare Hamilton
    Development Engineer
    Selwyn District Council
    Rolleston
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  • 5.  RE: Quality Assurance - Fill

    Posted 07-08-2015 15:02

    Hi  Clare

    The "default" compaction requirements of fill are often specified as 95% of its maximum dry density with recommended layer thickness's varying from 150 to 400mm. 
    However, cost effective compaction requirements should really reflect the purpose of the fill and the nature of the material used. 
    For instance :
    Layer thickness can very depending on the size and type of compaction plant as well as the grading of the material. 
    For general fill not underlying structures or infrastructure a target compaction of 90% is often acceptable and cheaper to achieve.
    In some case 98% may be specified under critical structures.
    Compaction and testing of clay fill is different to granular material.
    Vibrating plant should not be used in silt materials.
    Fill placed to form bunds steeper than 1v in 4h may also need to meet other geotechnical criteria related to their stability 

    The UK highway agency has an excellent specification document for earthworks which provides really useful guidance, details and specifications for the placement of fill and other earthwork material. 

    Are you thinking about a general guidelines or do you have specific project in mind?

    If you wish more information and guidance on this issue then I can call you to discuss.

    Matthew Naylor
    Associate Director - Ground Engineering
    AECOM New Zealand Ltd
    Christchurch
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