Calculation of the load capacity of a single pile Abaqus

Project Overview

In this Abaqus tutorial, the long-term load capacity of a single pile embedded in a homogeneous clay layer is calculated and compared with the corresponding result from the Sam Helwany book.

The example is selected from Example 8.4 of the Sam Helwany book. The pile is subjected to axial loading, and the main objective is to determine its load-carrying capacity.

Single Pile Model

The pile has a cylindrical shape with a diameter of 0.6 m and an embedded length of 16 m.

The pile is embedded in a thick, homogeneous clay layer and is loaded only in the axial direction.

Axisymmetric Model

Since the pile has a cylindrical geometry and is subjected only to axial loading, the problem has axisymmetric conditions.

Therefore, a two-dimensional axisymmetric model is used to reduce the computational cost while maintaining the essential behavior of the pile-soil system.

Pile-Soil Interaction

The interaction between the pile and the surrounding soil is modeled using a penalty-type interface.

A friction factor of 0.385 is defined between the pile and the soil to represent the frictional behavior along the pile-soil interface.

Clay Soil Model

The clay layer is modeled as an elastoplastic material using the Cap Model with Cap Hardening.

In addition to the constitutive parameters, the initial void ratio and geostatic stress are defined to represent the initial state of the saturated clay.

Drained Condition

The analysis is performed under drained conditions, which represent a relatively low loading rate.

Under the assumed drained condition, the pore water pressure is considered zero during the analysis.

Calculation of Pile Load Capacity

The pile is subjected to axial loading, and the response of the pile-soil system is obtained from the Abaqus analysis.

The load capacity obtained from the Abaqus simulation is then compared with the reference result reported in the Sam Helwany book.

Comparison of Results

According to the Sam Helwany book, the predicted load capacity of the pile is approximately 530 kN.

The Abaqus simulation predicts a load capacity of approximately 510 kN.

The close agreement between the numerical result and the reference result demonstrates that the Abaqus model can effectively reproduce the load-carrying behavior of the single pile.

What You Will Learn

• How to model a single pile in Abaqus.
• How to model a cylindrical pile using an axisymmetric model.
• How to create a two-dimensional axisymmetric soil model.
• How to define the interaction between pile and soil.
• How to use a penalty-type interface.
• How to define the friction factor between pile and soil.
• How to define saturated clay using the Cap Model.
• How to define Cap Hardening properties.
• How to define the initial void ratio.
• How to define geostatic stress in the soil.
• How to perform a drained analysis.
• How to calculate the load capacity of a single pile.
• How to obtain the pile load capacity from Abaqus.
• How to compare Abaqus results with reference results.

Key Features

• Long-term load capacity of a single pile.
• Cylindrical pipe pile.
• Pile diameter of 0.6 m.
• Embedded pile length of 16 m.
• Homogeneous clay layer.
• Two-dimensional axisymmetric model.
• Penalty-type pile-soil interface.
• Friction factor of 0.385.
• Elastoplastic clay behavior.
• Cap Model with Cap Hardening.
• Initial void ratio definition.
• Geostatic stress definition.
• Drained condition.
• Zero pore water pressure.
• Reference load capacity: 530 kN.
• Abaqus load capacity: 510 kN.
• Comparison with Sam Helwany book results.
• CAE file.
• INP file.
• Excel file containing the results.
• Step-by-step video tutorial.