Interpretation of Menard's Pressuremeter Tests in sandy soils through analytical and numerical methods

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Constitutive models play a fundamental role in numerical geotechnical analysis, enabling the consideration of complex soil and rock behavior. Within the generalized plasticity framework, the elastic strain increment is determined by employing the generalized Hookes Law, independently of the constitutive model applied. Therefore, accurately estimating the elastic modulus is essential to enhance the predictive capabilities of any constitutive model. Among field tests, the Menard Pressuremeter Test (MPT) has been recognized for over 70 years as one of the most reliable methods for determining in-situ soil deformability and strength parameters. This paper reviews the analytical and numerical methods available for interpreting MPT results in sandy soils, with a focus on estimating the soil deposits elastic modulus under loading and reloading conditions. It also presents the methodology for determining key strength parameters such as the internal friction angle and undrained shear strength. The study includes the interpretation of 46 MPTs performed in Mexico City, establishing correlations between the elastic modulus, NSPT blow count, and other conventional geotechnical parameters. Additionally, the influence of fine content on soil behavior is analyzed. Results show that sandy soils with fines content up to 30% continue to behave as granular materials. This finding has significant implications for assessing the long-term stability of geotechnical structures, as it directly impacts both shear strength and deformation characteristics. Finally, key recommendations are provided for interpreting MPT data in geotechnical site characterization, contributing to the development of more accurate constitutive models and enhancing the reliability of numerical simulations in geotechnical design.

8th International Symposium on Pressuremeters (ISP2025)

Pressuremeter Testing Techniques and procedures