Comparison and Application of Different Elasto-Plastic Constitutive Models in Fem Analysis of an Excavated Soil Slope

Abstract

A modified anisotropic elasto-plastic model is presented in this paper based on the frame work of Modified Cam-clay model and Original Sekiguchi-Ohta model by applying a new stress ratio parameter, through which the yield locus and hardening axis in the p-q plane were adjusted to give a more reasonable description of the practical excavation stress path from initial K0 state. Typical excavated soil slope was selected as the illustration example to carry out the finite element numerical analysis by applying four constitutive models (Original Cam-Clay, Modified Cam-Clay, Original Sekiguchi-Ohta and Modified Sekiguchi-Ohta). The calculated displacements of the slope with above different constitutive models were then compared with the measured infield data. It was found the field measured data agree better with the results calculated from modified model, which indicates that the modified anisotropic model is more suitable in the description of the stress path of excavated soils slope after K0 consolidation.

Numerical Analysis of Pipelines Settlement Induced by Tunneling

“…e constitutive model frequently used during the numerical simulation of underground excavation work is linear-elastic perfectly plastic with a Mohr-Coulomb (MC) failure criterion [16,17]. Several decades of scientific work took place on the influence of the constitutive model on the simulation of tunneling [18,19]. Using sophisticated constitutive models, including nonlinearity, prefailure, and high stiffness, under minimal strain considerably improves the prediction of displacements.…”

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

“…e HSS accurately reflects soil stress history, but it is difficult to obtain reasonable model parameters due to a lack of field test data. Previous scholars have extensively researched the influence of constitutive models on foundation pit construction simulations [29,30]. e linear elastic-perfectly plastic constitutive model of Mohr-Coulomb, with reliable physical parameters, is used in the Abaqus software [31][32][33][34].…”