Numerical Analysis of The Drained/Undrained Behaviour of Clays From Self-Boring Pressuremeter Test

DOI

10.2991/978-94-6463-900-1_36How to use a DOI?

Keywords

Self-Boring Pressuremeter Test; Numerical Analysis; Clay; Drained Behaviour; Consolidation

Abstract

The analysis of drained and undrained behavior in soft ground is a critical aspect of geotechnical engineering, particularly when assessing the distribution of excess pore water pressure and consolidation characteristics. In a self-boring pressuremeter test (SBPT), the drainage of clay depends on the soil permeability and the strain rate during probe expansion. This paper presents a series of numerical analyses investigating the drained and undrained behavior of soft ground through SBPT conducted on soft silty clay from the lacustrine deposits in Taihu Lake, China. The behavior of this soft deposits is simulated using an advanced incrementally nonlinear constitutive model, namely the Visco-hypoplastic model. The numerical results of the SBPT are compared with field data from a previous study and are discussed. Based on back-analysis, the parameters of the Visco-hypoplastic model for the soft silty clay of the lacustrine deposits are identified. The ranges of soil permeability coefficients and the expansion rate of probe for drained and undrained behavior are also provided. Fully drained behavior is observed when the normalized expansion velocity V <1 and k ≥ 1×10⁻⁹ m/s, whereas undrained behavior occurs when V >10⁴ and k ≥ 1×10⁻¹⁴ m/s. Other ranges of soil permeability correspond to partially drained behavior, which is influenced by the probe’s expansion rate during the SBPT expansion phase and is characterized through the normalized expansion velocity V.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Ba-Phu Nguyen
AU  - Seyed Mohsen Miraei
AU  - Stefan Vogt
AU  - Roberto Cudmani
PY  - 2025
DA  - 2025/12/07
TI  - Numerical Analysis of The Drained/Undrained Behaviour of Clays From Self-Boring Pressuremeter Test
BT  - Proceedings of the Rocscience International Conference 2025 (RIC 2025)
PB  - Atlantis Press
SP  - 368
EP  - 376
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-900-1_36
DO  - 10.2991/978-94-6463-900-1_36
ID  - Nguyen2025
ER  -