Géotechnique: Essai préssiométrique - Comment interpréter L' essai pressiométrique NF P 94-110-1

Put a like to encourage our efforts. In this video, I explain how to interpret the Menard pressiometric test according to the NF P 94-110-10. The test consists of doing a pre-drilling of a diameter of 63 mm Then, introduce the pressiometric probe to the desired depth. From the CPV (volume pressure controller) on the surface, apply pressure p. The injected volumes of water are recorded at 15 seconds, 30 and 60 seconds. Gross pressure values and gross volumes are corrected for corrected values by calculating the calibration pressure and deducting the probe's own expansion volume. The pressure curve, which is adjusted for the volume injected, can therefore be traced according to the pressure exerted. This curve has three parts: a ground-sounding contact phase, a pseudo-elastic phase to find Menard's pressiometric module and a plastic phase in which the limit pressure is calculated. This limit pressure can be determined either directly by simple interpolation or extrapolation (reverse curve method or hyperbolic extrapolation method). Then you can defer all the survey results to a graph called a pressiometric profile. This profile is used for sizing a wide range of geotechnical structures such as retaining walls, planks, shallow foundations, deep foundations, anchors, slope stability.