Project Overview
In this Abaqus tutorial, the bearing capacity of a strip foundation is calculated using two different soil plasticity models: Mohr-Coulomb plasticity and Drucker-Prager plasticity.
The numerical results obtained from both soil models are compared with the Terzaghi solution to evaluate the accuracy of the Abaqus simulations.
Strip foundation and surrounding soil modeled in Abaqus.
Two-Dimensional Model
The soil and foundation are modeled using a two-dimensional plane strain model.
The soil domain has a width of 40 m and a height of 20 m. The strip foundation is made of concrete and has a width of 2 m and a depth of 0.5 m.
Soil Plasticity Models
The problem is solved twice using two different constitutive models for the soil.
- Mohr-Coulomb plasticity
- Drucker-Prager plasticity
The bearing capacity obtained from each model is then compared with the theoretical Terzaghi solution.
Concrete Foundation
The strip foundation is modeled as a concrete component with linear elastic behavior.
The Young's modulus of the concrete is 21 GPa, and the Poisson's ratio is 0.2.
Analysis Steps
The analysis is performed using two steps.
- Step 1: The weight of the soil and foundation is applied.
- Step 2: A vertical displacement is applied to the foundation.
The vertical displacement gradually causes the foundation to move downward, allowing the bearing capacity of the soil to be obtained from the numerical response.
Strip foundation and surrounding soil modeled in Abaqus.
Bearing Capacity Results
The bearing capacity of the strip foundation is obtained separately using the Mohr-Coulomb and Drucker-Prager plasticity models.
The numerical results are then compared with the Terzaghi solution to evaluate the agreement between the finite element results and the theoretical solution.
Comparison of bearing capacity obtained from Mohr-Coulomb, Drucker-Prager, and Terzaghi solutions.
What You Will Learn
- How to model a strip foundation in Abaqus.
- How to create a two-dimensional plane strain model.
- How to model the surrounding soil.
- How to define Mohr-Coulomb plasticity for soil.
- How to define Drucker-Prager plasticity for soil.
- How to define the concrete foundation as a linear elastic material.
- How to apply the weight of the soil and foundation.
- How to apply vertical displacement to the foundation.
- How to calculate the bearing capacity of a strip foundation.
- How to compare Mohr-Coulomb and Drucker-Prager results.
- How to compare Abaqus results with the Terzaghi solution.
Key Features
- Two-dimensional plane strain analysis.
- Strip foundation with a width of 2 m.
- Foundation depth of 0.5 m.
- Soil domain width of 40 m.
- Soil domain height of 20 m.
- Concrete foundation.
- Young's modulus of concrete: 21 GPa.
- Poisson's ratio of concrete: 0.2.
- Mohr-Coulomb plasticity.
- Drucker-Prager plasticity.
- Terzaghi theoretical solution.
- Two analysis steps.
- Bearing capacity comparison.
- CAE file.
- INP file.
- Excel file containing the results.
- Terzaghi solution image.
- Friction angle calculation image.
- Vertical effective stress calculation image.
Project Information
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