Parameters Used in Calculations

Oct 13, 2025 by windailys.com 59 views

Analysis of Carrying Capacity and Decreased Elastic Foundation of Piles Using Analytical Methods and Element Methods: A Case Study of the Medan-Binjai Toll Road Project Yos Sudarso STA 1 + 323

Introduction

The foundation is a crucial component of an engineering system, responsible for transferring the load from the structure above it to the soil and rocks below. Among the various types of foundations, pile foundations are widely used in construction projects due to their ability to support heavy loads and withstand various environmental conditions. In designing pile foundations, it is essential to use various analytical methods to determine the carrying capacity of the foundation. This study aims to calculate and compare the axial carrying capacity of a single pile using several methods, including the Meyerhoff method based on Standard Penetration Test (SPT) data, data pile driving analyzer (PDA), and the element method (Meh). Additionally, the calculation of lateral carrying capacity is done using the Broms method. This study also calculates the elastic decline that occurred on the pile.

Research Purposes

The primary objective of this study is to investigate the carrying capacity of a single pile using various analytical methods and compare the results with numerical methods using special software, such as Plaxis. The study aims to provide valuable insights for better structural design and to identify the advantages and disadvantages of each method. The data used in this study was obtained from consultants and related construction companies involved in the Medan-Binjai Toll Road Project Yos Sudarso STA 1 + 323.

Calculation Methods

Several methods were used to calculate the carrying capacity of the single pile, including:

Meyerhoff Method: This method is based on SPT data and is widely used to determine the carrying capacity of piles.
Data Pile Driving Analyzer (PDA): This method uses data from pile driving tests to determine the carrying capacity of piles.
Element Method (Meh): This method uses numerical analysis to determine the carrying capacity of piles.
Broms Method: This method is used to calculate the lateral carrying capacity of piles.

Calculation Results

The results of the calculations carried out in this study are presented below:

Axial Carrying Capacity:
- With SPT data: 293.62 tons
- With PDA data: 296 tons
- With the element method up to: 308.43 tons
Lateral Carrying Capacity:
- Analytical Results: 32.8 tons
- Graphic Results: 29.2 tons
Elastic Decline:
- Poulos Davis Method: 6.04 mm
- Decreased elastic single pole: 2.88 mm
- Decrease from PDA data: 11.5 mm
- Decreases with the element method up to: 11.75 mm

Difference Analysis

The results of the calculations show significant differences in the carrying capacity and decline of the single pile using various methods. The main factors contributing to these differences are:

Variation of Soil Types: Different types of soil have characteristics that affect the carrying capacity of piles, such as density, humidity, and consistency.
Testing Methods: The way to carry out testing can also affect the results, and the accuracy of the operator in conducting testing is very important to get accurate data.
Parameters Used in Calculations: The difference in parameters used in calculations can also contribute to the variability of the results.

Conclusion

The analysis of carrying capacity and decreased elastic foundation of piles using analytical methods and element methods provides valuable insights for better structural design. The calculation results show that even though there are differences in value, each method has advantages and disadvantages of each. Therefore, the selection of appropriate methods based on soil conditions and project needs is very important to achieve optimal and safe results for construction. In practice, the combination of numerical analysis and field testing results can provide more comprehensive guidelines for planning and building a strong and effective foundation.

Recommendations

Based on the results of this study, the following recommendations are made:

Use of Multiple Methods: The use of multiple methods to calculate the carrying capacity of piles can provide a more comprehensive understanding of the behavior of the pile foundation.
Soil Investigation: A thorough soil investigation is essential to determine the characteristics of the soil and to select the appropriate method for calculating the carrying capacity of piles.
Numerical Analysis: Numerical analysis can provide a more accurate prediction of the behavior of the pile foundation, and can be used in conjunction with field testing results to provide more comprehensive guidelines for planning and building a strong and effective foundation.

Future Research Directions

Future research directions include:

Development of New Methods: The development of new methods for calculating the carrying capacity of piles can provide more accurate and reliable results.
Validation of Methods: The validation of methods used to calculate the carrying capacity of piles is essential to ensure that the results are accurate and reliable.
Case Studies: Case studies of pile foundations in various projects can provide valuable insights for better structural design and can help to identify the advantages and disadvantages of each method.
Frequently Asked Questions (FAQs) about Carrying Capacity and Decreased Elastic Foundation of Piles

Q: What is the carrying capacity of a pile foundation?

A: The carrying capacity of a pile foundation refers to the maximum load that a pile can support without failing or deforming excessively. It is an important parameter in designing pile foundations to ensure that they can support the loads imposed by the structure above.

Q: What are the factors that affect the carrying capacity of a pile foundation?

A: The carrying capacity of a pile foundation is affected by several factors, including:

Soil type: The type of soil that the pile is embedded in affects its carrying capacity.
Pile length: The longer the pile, the greater its carrying capacity.
Pile diameter: The larger the pile diameter, the greater its carrying capacity.
Load type: The type of load imposed on the pile affects its carrying capacity.
Pile material: The material used to construct the pile affects its carrying capacity.

Q: What is the difference between axial and lateral carrying capacity?

A: Axial carrying capacity refers to the maximum load that a pile can support in the direction of its axis, while lateral carrying capacity refers to the maximum load that a pile can support perpendicular to its axis.

Q: What is the purpose of calculating the elastic decline of a pile foundation?

A: The elastic decline of a pile foundation refers to the deformation of the pile under load. Calculating the elastic decline is important to ensure that the pile foundation can support the loads imposed by the structure above without excessive deformation.

Q: What are the methods used to calculate the carrying capacity and elastic decline of a pile foundation?

A: Several methods are used to calculate the carrying capacity and elastic decline of a pile foundation, including:

Meyerhoff method: This method is based on Standard Penetration Test (SPT) data.
Data Pile Driving Analyzer (PDA): This method uses data from pile driving tests.
Element method: This method uses numerical analysis.
Broms method: This method is used to calculate the lateral carrying capacity.

Q: What are the advantages and disadvantages of each method?

A: Each method has its advantages and disadvantages. For example:

Meyerhoff method: Advantages: simple and easy to use. Disadvantages: may not be accurate for all soil types.
Data Pile Driving Analyzer (PDA): Advantages: provides accurate results. Disadvantages: requires specialized equipment and expertise.
Element method: Advantages: provides accurate results. Disadvantages: requires significant computational resources and expertise.
Broms method: Advantages: simple and easy to use. Disadvantages: may not be accurate for all soil types.

Q: What are the recommendations for designing pile foundations?

A: The recommendations for designing pile foundations include:

Use of multiple methods: Use multiple methods to calculate the carrying capacity and elastic decline of a pile foundation.
Soil investigation: Conduct a thorough soil investigation to determine the characteristics of the soil.
Numerical analysis: Use numerical analysis to predict the behavior of the pile foundation.
Field testing: Conduct field testing to validate the results of numerical analysis.

Q: What are the future research directions in pile foundation design?

A: Future research directions in pile foundation design include:

Development of new methods: Develop new methods for calculating the carrying capacity and elastic decline of a pile foundation.
Validation of methods: Validate the methods used to calculate the carrying capacity and elastic decline of a pile foundation.
Case studies: Conduct case studies of pile foundations in various projects to provide valuable insights for better structural design.