Standard Test Methods for Prebored Pressuremeter Testing in Soils

Importancia y uso:

5.1 This test method provides a radial stress-strain response of the soil in situ. A pressuremeter modulus and a limit pressure are obtained for use in geotechnical analysis and foundation design. Correlations of the test results to soil strength and stiffness and to engineering design applications are generally empirical, and deviation from the methodology described in this test method may have undesirable effects.

Note 5: As with other in situ and laboratory test methods, the user should consider whether results from this test are appropriate for the intended design use. Considerations may include whether the test directly measures strength or stiffness, the orientation of loading, the level of induced strain, insertion or borehole disturbance effects, soil sensitivity, soil saturation, drainage effects, and the robustness of the test equipment, etc.

5.2 The results of this test method are dependent on the clearance between the test cavity and probe and the degree of ground disturbance caused by test cavity preparation and probe insertion, all of which shall be considered during interpretation of the test results. This disturbance is particularly significant in very soft clays and very loose sands. Disturbance may not be eliminated completely but shall be minimized for the prebored pressuremeter design rules to be applicable.

Note 6: 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 testing/sampling/ inspection/etc. Users of this test method 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:

D6286_D6286M-20, D0420-18, D8359-21

Volúmen:

04.08

Número ICS:

93.020 (Earthworks. Excavations. Foundation construction. Underground works)

Palabras clave:

creep limit; in situ test; limit pressure; modulus; stress-strain;