Application of the Limit State Method to Geotechnical Design of Deep Excavation Systems in Egypt
Muhammad Diab Saadeldin Abdlaal;
Abstract
The geotechnical design of deep excavation systems in Egypt adopts the Working (Allowable) Stress Design (WSD/ASD) method according to the current version of the Egyptian Code of Practice for Soil Mechanics and Design and Construction of Foundations (ECP-202, 2001). On the other hand, the Limit States Design (LSD) method is adopted for the structural design of superstructures. This inconsistency in the design approach causes confusion to design engineers, and may also lead to design errors, which may have severe consequences in large projects. Therefore, the application of the LSD method in deep excavation systems design has become a main design requirement.
This research aims primarily at determining the required partial factors for the LSD method such that the LSD outcome matches the WSD outcome. The LSD method can be divided into two main approaches; the factored strength approach (FSA) and the factored resistance approach (FRA), which is also known as the load and resistance factor design (LRFD) method. The two approaches are applied in this research study to the geotechnical design of deep excavation systems. A simple configuration of a cantilever wall embedded in dry cohesionless sand is considered. The main objective of this research study is to determine the required partial factors according to the two LSD approaches such that the LSD outcome matches the WSD outcome. The required parameters for each of the FSA and FRA were determined by the
iv
“calibration-by-fitting” technique. The determined partial factors of the FSA and FRA were compared with the recommended values in some international codes, and recommendations were provided for the appropriate factors to be considered in the future edition of ECP-202 (2001).
In order to achieve the research objectives, this thesis is divided into five chapters. Each chapter can be outlined as follows:
Chapter (1): This chapter represents an overview of the problem to be approached in this research, followed by presentation of the main objectives of the research study and an outline of the thesis structure.
Chapter (2): The second chapter of this study provides a comprehensive review of the WSD and LSD methods and their application in geotechnical engineering problems. The main differences between the two methods, the WSD and LSD, are discussed in detail. Further, the historical development and differences between the two main LSD approaches, the FSA and FRA, are explained. This chapter also provides a literature review of the previous studies related to the application of the limit states design method in geotechnical engineering design. The chapter also presents the guidelines recommended by different codes of practice with respect to the relevant partial factors in the LSD method.
Chapter (
This research aims primarily at determining the required partial factors for the LSD method such that the LSD outcome matches the WSD outcome. The LSD method can be divided into two main approaches; the factored strength approach (FSA) and the factored resistance approach (FRA), which is also known as the load and resistance factor design (LRFD) method. The two approaches are applied in this research study to the geotechnical design of deep excavation systems. A simple configuration of a cantilever wall embedded in dry cohesionless sand is considered. The main objective of this research study is to determine the required partial factors according to the two LSD approaches such that the LSD outcome matches the WSD outcome. The required parameters for each of the FSA and FRA were determined by the
iv
“calibration-by-fitting” technique. The determined partial factors of the FSA and FRA were compared with the recommended values in some international codes, and recommendations were provided for the appropriate factors to be considered in the future edition of ECP-202 (2001).
In order to achieve the research objectives, this thesis is divided into five chapters. Each chapter can be outlined as follows:
Chapter (1): This chapter represents an overview of the problem to be approached in this research, followed by presentation of the main objectives of the research study and an outline of the thesis structure.
Chapter (2): The second chapter of this study provides a comprehensive review of the WSD and LSD methods and their application in geotechnical engineering problems. The main differences between the two methods, the WSD and LSD, are discussed in detail. Further, the historical development and differences between the two main LSD approaches, the FSA and FRA, are explained. This chapter also provides a literature review of the previous studies related to the application of the limit states design method in geotechnical engineering design. The chapter also presents the guidelines recommended by different codes of practice with respect to the relevant partial factors in the LSD method.
Chapter (
Other data
| Title | Application of the Limit State Method to Geotechnical Design of Deep Excavation Systems in Egypt | Other Titles | تطبيق طريقة حالات الحدود في التصميم الجيوتقني لأنظمة سند جوانب الحفر العميق في مصر | Authors | Muhammad Diab Saadeldin Abdlaal | Issue Date | 2018 |
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