Triaxial tests on SANICLAY soil


Application GeoStudio
Version Latest version
Primary Analysis SIGMA/W
Keywords GeoStudio, SIGMA/W, triaxial, test, compression, CAU, CAD, drained, K0, Dafalias, Taiebat

Introduction

This example simulates a series of triaxial compression tests, which can be used to verify that the SANICLAY constitutive model is functioning properly. The simulations include 𝐾0-consolidated undrained (CAU) and drained (CAD) triaxial tests performed at various overconsolidation ratios (𝑂𝐢𝑅), following two distinct stress initialization procedures.

The first procedure (A) simulates the complete consolidation stress history before triaxial loading is performed, which consists of drained 𝐾0-loading, followed by drained 𝐾0-unloading to the desired 𝑂𝐢𝑅. This procedure ensures proper initialization of SANICLAY’s internal parameters (𝛼, 𝛽 and 𝑝0) prior to the beginning of triaxial loading.

The second procedure (B) uses direct stress initialization to the desired stress state, using well-known relationships to estimate  πΎ0𝑛𝑐 and 𝐾0π‘œπ‘ based on the soil’s friction angle φ. In this case, SANICLAY’s internal parameters are initiated based on the estimated 𝐾0 values, rather than a complete stress history initialization. 

The simulation covers both versions of the model, which are called RH 2006 and RH 2013, in this document. The verification includes comparisons with simulation results provided by Dafalias et al. (2006) and Dafalias and Taiebat (2013) and discussions relative to the SANICLAY theoretical framework. Results from corresponding laboratory tests are also used to highlight SANICLAY’s superior soil behaviour modelling capabilities. Users are encouraged to consult the SIMGA/W user guide while reading through this example.

Triaxial tests on SANICLAY soil.png

 

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