PARTICLES 2023

Numerical Investigation of Pressuremeter Test with Material Point Method

  • Kurugodu, Harsha Vardhan (Indian Institute of Technology Delhi)
  • Bhattacharya, Debayan (Indian Institute of Technology Delhi)
  • Vangla, Prashanth (Indian Institute of Technology Delhi)
  • Frost, David (Georgia Institute of Technology)

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In situ tests for geotechnical investigations provide a reliable estimate of the soil behaviour because of their accurate representation of the stress state, which preserves the soil structure and the inherent material fabric. These tests in fact complement the information obtained from laboratory element tests. Pressuremeter test is one such variant of an in-situ tool that is used to obtain soil properties based on measured pressure-volume data. Within a numerical framework, the pressuremeter test is considered as a large deformation problem. Furthermore, it is commonly idealized as a cylindrical cavity expansion problem (Rui and Yin 2018) within the realms of conventional finite element schemes. In order to address the issue related to excessive mesh distortion aspects, the Eulerian-Lagrangian approach developed within the continuum framework, namely the Material Point Method (MPM), has been (Bisht et al., 2021; Yost et al., 2023) adopted in the present study to investigate the pressuremeter problem. First, the results obtained are benchmarked against those from classical cavity expansion problems for a pressure-dependent frictional material. The computed results are in good agreement with both the closed-form solutions and displacement-controlled experiments reported in the existing literature. A parametric study was further performed to investigate the influence of the loading rate, material properties, and heterogeneities on the pressuremeter test simulations.