Soft Clay Stiffness Measured in Ho Chi Minh City with Oedometer Tests for Deep Excavation Calculation

Abstract

AbstractTo calculate the stability and deformation of the deep excavation in Ho Chi Minh City (HCMC) in particular and Vietnam in general often use the Finite Element Method (FEM) with Mohr-Coulomb (MC), Hardening Soil (HS) model. The HS model built based on the Hyperbolic model shows more progress than the MC model. The HS model also explains the dependence of the modulus on stress. The degree of dependence of stress is given by the exponent m. To simulate the dependence of the stress according to the logarithmic law, the exponent parameter (m) has different values depending on the soil type, the choice of the exponential parameter makes it difficult for engineers to correlate from experimental expressions because this amplitude is still relatively wide and gives a large difference in calculation results. This paper determines parameter m and the correlation coefficient Eoed/E50 for soft soil in HCMC is based on the Oedometer test as identified in the HS model to calculate deep excavation.KeywordsDeep excavationHardening soilStiffnessOedometer test