Table 7.14.

Dynamic (window/windowless) sampling

Dynamic (window/windowless) samplingMethodApplicationsLimitations
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  • Light, portable hand-held or chassis mounted equipment which drives sampling tubes of varying diameter/length into ground to recover a near-continuous soil sample;

  • 35–100 mm diameter;

  • Depth 8–15 m;

  • 25–30 m per day achievable;

  • Working area 2 m by 4 m required with 3–4 m clear headroom.

  • Sites where unrestricted vehicle access can be gained. Tracked mounted and hand-held units may be deployed on sloping/rough terrain or on the crest of levees.;

  • Obtain disturbed and intact samples;

  • Permits SPTs and borehole vane testing;

  • Best suited to firm to stiff clay;

  • Installation of simple monitoring wells.

  • Not suitable for granular, very coarse grained soils, very dense or hard soils or made ground containing very coarse or resilient material;

  • Poor core recovery in loose granular and very soft soils;

  • Vibration and noise associated with the driving process.

Cost factor: Low.
Relevance to glacial/periglacial depositsSuitable for preliminary site assessments and to obtain samples for the purposes of developing an environmental history of events on a site to aid the interpretation of site geomorphology. May be suitable for simple investigations assessing the basic geotechnical parameters of near-surface glacial deposits. Not suitable for penetrating cobble bands and clast-rich tills.