Monnet Boutonnier (2026) Study of the consolidation using a pressuremeter apparatus

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This study demonstrates that the pressuremeter test (PMT), with pore pressure measurement, can measure key parameters for soil consolidation theory. Traditional interpretations assume linear elasto-plastic behavior and do not take into account pore pressure increase. We propose a new approach: by modelling the compressible interstitial fluid (water-air mixture) and accounting for non-linear soil elasticity, PMT can estimate both the effective modulus and generated pore pressure. The consolidation process around the probe is shown to follow a one-dimensional radial pattern, similar to oedometer tests, governed by the consolidation coefficient . Using theoretical developments and experimental validation on Bransley clay, we establish a direct relationship between pore pressure dissipation and time, enabling the determination of and the Skempton coefficient from PMT data. Laboratory and in-situ tests confirm the method’s accuracy, even without full pore pressure dissipation. These results position PMT as a practical tool for assessing soil consolidation and effective soil parameters, offering a new way to analyse soil behaviour, in addition to conventional methodsThis study demonstrates that the pressuremeter test (PMT), with pore pressure measurement, can measure key parameters for soil consolidation theory. Traditional interpretations assume linear elasto-plastic behavior and do not take into account pore pressure increase. We propose a new approach: by modelling the compressible interstitial fluid (water-air mixture) and accounting for non-linear soil elasticity, PMT can estimate both the effective modulus and generated pore pressure. The consolidation process around the probe is shown to follow a one-dimensional radial pattern, similar to oedometer tests, governed by the consolidation coefficient . Using theoretical developments and experimental validation on Bransley clay, we establish a direct relationship between pore pressure dissipation and time, enabling the determination of and the Skempton coefficient from PMT data. Laboratory and in-situ tests confirm the method’s accuracy, even without full pore pressure dissipation. These results position PMT as a practical tool for assessing soil consolidation and effective soil parameters, offering a new way to analyse soil behaviour, in addition to conventional method.