Standard Practices for Obtaining Intact Block (Cubical and Cylindrical) Samples of Soils

Importancia y uso:

4.1 Intact block samples are suitable for laboratory tests where large-sized samples of intact material are required or where such sampling is more practical than conventional tube sampling (Practices D1587/D1587M and D6519), or both.

4.2 The intact block method of sampling is advantageous where the soil to be sampled is near the ground surface. It is the best available method for obtaining large intact samples of very stiff and brittle soils, partially cemented soils, and some soils containing coarse gravel.

4.3 Excavating a column of soil will relieve stresses in the soil and may result in some expansion of the soil and a corresponding decrease in its unit weight (density) or increase in sampling disturbance, or both. Usually the expansion is small in magnitude because of the shallow depth. Stress changes alone can cause enough disturbances in some soils to significantly alter their engineering properties.

4.4 The chain saw has proved advantageous in sampling difficult soils, which are blocky, slickensided, or materials containing alternating layers of hard and soft material.3 The chain saw uses a special carbide-tipped chain.4

Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective sampling. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.

Subcomité:

D18.02

Referida por:

D6169_D6169M-21, D7243-11R20, D2166_D2166M-24, D7263-21, D7263-21, D2166_D2166M-24, D6528-24, D7263-21

Volúmen:

04.09

Número ICS:

13.080.05 (Examination of soil in general)

Palabras clave:

block sample; block sampling; cylindrical sampling; geologic investigations; intact; sampling; soil exploration; soil investigations; subsurface investigations;