Consideration of local geotechnical conditions

Oct 13, 2025 by wbrum.org 141 views

Comparison of Carrying Capacity and Decreased Foundation of Piles with Analytical Methods and Element Methods up to Bore Hole I

Introduction

In the development of infrastructure, the foundation plays a crucial role in ensuring the stability and safety of the structure. The foundation is responsible for transferring the load from the building to the ground below, without exceeding the specified tolerance limit. Therefore, careful planning and design of the foundation are essential to withstand the maximum load that may occur. This article discusses the comparison of carrying capacity and decreased foundation of piles using two approaches, namely the analytical method and the element method, based on the case study of the construction of the Bajayu Sei Padang Dam in Serdang Bedagai Regency, North Sumatra.

Research Methodology

The research methodology employed in this study involves the calculation of the axial carrying capacity of the pile foundation using various methods, such as Meyerhoff, as well as the calculation of carrying capacity using the element method up to. In addition, lateral carrying capacity is calculated using the Broms method. The elastic decline in piles was also analyzed, along with the efficiency and carrying capacity of the pole group. Data collection was carried out through field observation and data collection from service companies, including SPT, Sondir, PDA, and calendar data.

Calculation Results

The calculation results of the carrying capacity of the ultimate pole show significant variations depending on the method used. The data in Bore Hole I at a depth of 18.6 meters shows that the carrying capacity based on SPT is 107.56 tons. Meanwhile, Sondir data shows a value of 256,666 tons, and the calculation results from the PDA in the dam body are 108 tons. The calendar method, with the Hiley approach, produces 301,8269 tons, while the ENR and Danish Formula methods each gives a value of 170,388 tons and 264,683 tons. On the other hand, the element method to obtain a carrying capacity of 95.21 tons.

The lateral ultimate carrying capacity based on the analytical Broms method reaches 8,52704 tons, while graphically is 8,60636 tons. For a single elastic decrease, the calculation results show a value of 7.03 mm, which is in harmony with the results of the poulus and davis methods that show a decrease of 9.04 mm.

Analysis and Interpretation

The analysis of the calculation results shows significant variations in the carrying capacity and decreased foundation of piles. This difference can be attributed to several factors, such as the type of soil in the location, the method of carrying out testing depends on the accuracy of the operator, and the parameters used in the calculation. Analytical methods tend to provide higher results than the element method to, which may be caused by more conservative assumptions in element analysis up to. In addition, local geotechnical conditions, such as soil density and the presence of ground water, can also affect the results obtained.

Importance of Foundation Planning

The comparison of carrying capacity and decreased foundation of piles between analytical methods and element methods to show significant differences, which must be considered in foundation planning. By understanding this variation, engineers can plan a more efficient and safer foundation, in accordance with soil conditions and the type of building to be erected. The whole analysis emphasizes the importance of a holistic and thorough approach in foundation planning.

Conclusion

In conclusion, the comparison of carrying capacity and decreased foundation of piles using analytical methods and element methods up to Bore Hole I shows significant differences. This study highlights the importance of careful planning and design of the foundation to ensure the stability and safety of the structure. By understanding the variation in carrying capacity and decreased foundation of piles, engineers can plan a more efficient and safer foundation, in accordance with soil conditions and the type of building to be erected.

Recommendations

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

Use of multiple methods: Engineers should use multiple methods to calculate the carrying capacity and decreased foundation of piles to ensure accurate results.
Consideration of local geotechnical conditions: Local geotechnical conditions, such as soil density and the presence of ground water, should be considered in foundation planning.
Verification with deeper field testing: Verification with deeper field testing is recommended to get more accurate results.
Holistic and thorough approach: A holistic and thorough approach should be employed in foundation planning to ensure the stability and safety of the structure.

Future Research Directions

Future research directions include:

Development of new methods: Development of new methods to calculate the carrying capacity and decreased foundation of piles.
Investigation of local geotechnical conditions: Investigation of local geotechnical conditions to improve the accuracy of foundation planning.
Verification of results: Verification of results using deeper field testing to ensure accuracy.

By following these recommendations and future research directions, engineers can plan a more efficient and safer foundation, in accordance with soil conditions and the type of building to be erected.
Frequently Asked Questions (FAQs) about Carrying Capacity and Decreased Foundation of Piles

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

A: The carrying capacity of a pile foundation is the maximum load that a pile can withstand without failing. It is an important factor in determining the stability and safety of a structure.

Q: What is the decreased foundation of a pile?

A: The decreased foundation of a pile refers to the settlement or movement of the pile foundation due to external loads or soil conditions. It is an important factor in determining the stability and safety of a structure.

Q: What are the different methods used to calculate the carrying capacity and decreased foundation of piles?

A: There are several methods used to calculate the carrying capacity and decreased foundation of piles, including:

Analytical methods, such as the Meyerhoff method and the Broms method
Element methods, such as the finite element method
Field testing methods, such as the Standard Penetration Test (SPT) and the Dynamic Cone Penetrometer (DCP)

Q: What are the advantages and disadvantages of analytical methods?

A: Analytical methods have several advantages, including:

They are relatively fast and inexpensive to perform
They can provide accurate results for simple soil conditions
They can be used to calculate the carrying capacity and decreased foundation of piles for a wide range of soil conditions

However, analytical methods also have several disadvantages, including:

They may not accurately represent complex soil conditions
They may not account for non-linear soil behavior
They may not provide accurate results for piles with complex geometries

Q: What are the advantages and disadvantages of element methods?

A: Element methods have several advantages, including:

They can accurately represent complex soil conditions
They can account for non-linear soil behavior
They can provide accurate results for piles with complex geometries

However, element methods also have several disadvantages, including:

They are relatively slow and expensive to perform
They require significant computational resources
They may not provide accurate results for simple soil conditions

Q: What are the advantages and disadvantages of field testing methods?

A: Field testing methods have several advantages, including:

They can provide accurate results for complex soil conditions
They can account for non-linear soil behavior
They can provide accurate results for piles with complex geometries

However, field testing methods also have several disadvantages, including:

They are relatively slow and expensive to perform
They require significant equipment and personnel
They may not provide accurate results for simple soil conditions

Q: How can engineers ensure the stability and safety of a structure?

A: Engineers can ensure the stability and safety of a structure by:

Conducting thorough site investigations and soil testing
Using multiple methods to calculate the carrying capacity and decreased foundation of piles
Verifying results with deeper field testing
Considering local geotechnical conditions and soil behavior
Employing a holistic and thorough approach to foundation planning

Q: What are the future research directions in the field of pile foundation engineering?

A: Future research directions in the field of pile foundation engineering include:

Development of new methods to calculate the carrying capacity and decreased foundation of piles
Investigation of local geotechnical conditions and soil behavior
Verification of results using deeper field testing
Development of more accurate and efficient field testing methods
Investigation of the effects of climate change on pile foundation behavior

By understanding the carrying capacity and decreased foundation of piles, engineers can ensure the stability and safety of a structure and provide accurate and reliable results.