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Evaluating the methodology and performance of jetting and flooding of granular backfill materials.
  • Published Date:
    2014-11-01
  • Language:
    English
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Evaluating the methodology and performance of jetting and flooding of granular backfill materials.
Details:
  • Publication/ Report Number:
    WisDOT ID no. 0092-11-03
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  • Abstract:
    Compaction of backfill in confined spaces on highway projects is often performed with small vibratory plates, based

    solely on the experience of the contractor, leading to inadequate compaction. As a result, the backfill is prone to

    erosion and often exhibits excessive settlements, causing loss of support beneath pavements. The scope of this project

    includes developing standard specifications for two alternative hydraulic compaction methods, flooding and jetting,

    which additionally are suitable in confined spaces. During flooding, or compaction by drainage, the backfill layer is

    saturated with water from the surface and allowed to drain. During jetting, a probe emitting a high pressure jet of

    water is inserted into the layer, and the backfill is allowed to drain. In slurry flooding, a slurry mix is flood into place

    and it is allowed to drain so the lift gains strength. In these cases the energy of the flowing water and residual suction

    upon drainage increase the effective stress and move the grains into a denser arrangement. The results in the lab

    indicate that for compaction by drainage applications, uniform, rounded soils achieve the highest relative density due

    to their minimal particle interlocking upon deposition and subsequent high drainage capacity. Meanwhile during

    jetting applications, soils liquefy locally around the jet of water, and their compactness upon drainage is highly

    dependent on the hydraulic gradient, or the energy with which water drains from the pore space. Greater hydraulic

    gradient during the drainage phase of jetting has been observed to produce more compact soil structure.

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