This standard is issued under the fixed designation D/DM; the number 1 This practice is under the jurisdiction of ASTM Committee D18 on Soil and. GeoTesting Express is a provider of Soil Testing Services – ASTM D, Standard Practice for Thin-Walled Tube Sampling of Soils for Geotechnical Purposes. ASTM D/DM Standard Practice for Thin-Walled Tube Sampling of Fine-Grained Soils for Geotechnical Purposes. standard by.
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This practice does not address environmental sampling; consult D and D for information on sampling for environmental investigations. Proper lengths to be determined as suited to field conditions.
If samples are taken in uncased boreholes the cores should be inspected for any sidewall contamination. Disturbance and sample quality can be evaluated by looking at recompression strains in the One-Dimensional Consolidation test see Andressen and Kolstad 5. For information on appropriate use of other soil samplers refer to Xstm D Use of metric equivalent is acceptable as long as thickness and aetm are similar to those required in this standard. Such samplers include driven split barrel samplers and soil coring devices Asym Methods DDand Practice D Typical sizes of thin-walled tubes are shown on Table 1.
Softer formations may require sharper cutting angles of 5 to 10 degrees, however, sharp angles may be easily damaged in deeper borings. Active view current version of asrm.
ASTM D, Test equipment Controls
Link to Active This link will always route to the current Active version of the standard. The sample depth of the sampler should coincide with the drilled depth. The one to two week period is just guideline typically used in practice.
Subsurface geotechnical explorations should be reported in accordance with practice D This practice discusses some aspects of sample preservation after the sampling event. It was not possible to unsubscribe – please try again later or contact the Danish Standard Please make sure you are logged in.
Any drilling method that ensures the base of the borehole is intact and that the borehole walls are stable may be used.
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However, if this practice is used properly, soil samples suitable for laboratory testing can be procured.
This sampling method is not recommended for sampling soils containing gravel or larger size soil particles cemented or very hard soils. Extruded cores can be preserved by encasing the cores in plastic wrap, tin foil, and then microcrystalline wax to preserve moisture.
In cases where the soil is very weak, it may be required to cut sections of the tube to remove soil cores for laboratory testing. Sands are much more difficult to penetrate and may require use of smaller diameter tubes.
For information on appropriate use of other soil samplers refer to Practice D Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Consolidation test specimens are generally larger diameter than those for strength testing and larger diameter soil cores may be required. Not all aspects of this practice may be applicable in all circumstances. For determination of undrained strength, unconfined compression or unconsolided, undrained triaxial compression tests are often used Test Methods D and D Such samplers include driven split barrel samplers and soil coring devices Test Methods D, D, and Practice D The tubes are also usually supplied with a machine-beveled inside cutting edge which provides the Clearance Ratio C r.
One variation is a Bishop-type thin-walled sampler that is capable of holding a vacuum on the sampler to improve recovery 12. This is because once the core is in contact with the steel tube, there are galvanic reactions between the tube and the soil which generally cause the annulus core to harden with time.
Are you sure you want to unsubscribe monitoring? Are you sure you want to unsubscribe? The outside cutting edge of the end of the tube is machined-sharpened to a cutting angle Fig. Samples that must be obtained by driving should be labeled as such to avoid any advanced laboratory testing for engineering properties. The most commonly used tube is the 3-in. Not all aspects of this practice may be applicable in all circumstances.
Other soil samplers may be used for sampling these soil types. Do not show this again. Field extrusion and inspection of the soil core c1587 also help evaluate sample quality. For information d587 preservation and transportation process of soil samples, consult Practice D