ASTM D4719 PDF

More D Scope 1. A pressuremeter test is an in situ stress-strain test performed on the wall of a borehole using a cylindrical probe that is expanded radially. To obtain viable test results, disturbance to the borehole wall must be minimized. Knowledge of the type of soil in which each pressuremeter test is to be made is necessary for assessment of 1 the method of boring or probe placement, or both, 2 the interpretation of the test data, and 3 the reasonableness of the test results. This test method is limited to the pressuremeter which is inserted into predrilled boreholes or, under certain circumstances, is inserted by driving.

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Description and procedure The pressuremeter test is an in-situ testing method used to achieve a quick measure of the in-situ stress-strain relationship of the soil.

In principle, the pressuremeter test is performed by applying pressure to the sidewalls of a borehole and observing the corresponding deformation. The pressuremeter consists of two parts, the read-out unit which rests on the ground surface, and the probe that is inserted into the borehole ground.

As the pressure increases, the borehole walls deform. The pressure is held constant for a given period and the increase in volume required for maintaining the constant pressure is recorded. A load-deformation diagram and soil characteristics can be deduced by measurement of the applied pressure and change in the volume of the expanding membrane. The major difference between categories of pressuremeter lies in the method f installation of the instrument into the ground.

There are different approaches the interpretation of results and the determination of material properties from pressuremeter tests. In general, these approaches rely either on empirical correlations to allow measured co-ordinates of pressure and displacement to be inserted directly into design equations, or on solving the boundary problem posed by the pressuremeter test.

Figure 1. Clayton, M. Matthews and N. Michael Duncan, and Charles J.

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ASTM D4719

More D The exposure may be continuous or intermittent and may occur over wide temperature ranges. It yields comparative data on which to base judgment as to expected service quality. Scope 1.

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More D 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. 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. 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. Users of this test method are cautioned that compliance with Practice D does not in itself assure reliable results.

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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. 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. 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.

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