Careful extraction always in a vertical position.The following is a list of minimum precautions which should be observed: The following values may be used as guides for deciding bore diameter.Īfter extraction, a correct and careful procedure must be followed to preserve sample integrity. The bore diameter should be adjusted according to the needs of each specific project. The following table shows the sampling techniques available and the recommended applications for each, together with their advantages and disadvantages:Ĭohesive soft to firm soils Granular soils without gravel 3.6 Pulverizing Apparatus Either a mortar and rubber covered pestle, or a mechanical device mauler and a mortar suitable for breaking up the aggregations of soil particles without reducing the size of the individual grains. (3) Commonly used laboratory tests for soil identification and determination of. 3.5 Sample Splitter Riffle type sample splitter to reduce sample to test portion size in accordance with CP 32. The choice of sampling equipment, in terms of both the project needs and the type of soil, is key to obtaining high quality, representative samples. Soil classification properties may be obtained also from disturbed samples. Igeotest has developed a methodology for the extraction of undisturbed samples, as well as a specific device which offers a new perspective of an activity hitherto ill-considered in our country notwithstanding its vital importance when undertaking a geotechnical characterisation campaign. Undisturbed sample is the exact soil layer beneath the ground obtained without mix of layers within. Poor quality samples may result in non-representative results being obtained in lab tests, the use of which may give rise to faulty designs. The sample obtained may be disturbed or undisturbed one.
Obtaining high-quality undisturbed samples is one of the biggest challenges faced in the field of geotechnology.
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