Abstract:
For deep excavations, a retention system is mandatory not only for the safety of surrounding structures, but also for safe and proper execution of construction work within the parameter. This document serves as a comprehensive evaluation and comparison of design procedures available for retention systems comprising of piles and anchors. The design procedure consists of two components to be worked out separately, the piles, and the ground anchors. The approaches of FHWA Circular No.4 and Canadian Foundation Engineering manual have been used as a major reference to evaluate the design procedures, and hence to draw a comparison between the methods available. Detailed procedures for design methods of anchors and piles mentioned in FHWA Circular No.4 and Canadian Foundation Engineering Manual are discussed. Moreover some modifications with justifications are made in these aforementioned design techniques. To demonstrate the design, a number of case studies have been discussed. The comparison has been made on the basis of results obtained by the application of different methods on the case studies. In addition to the design considerations and procedures, general detail has also been discussed to highlight the necessity of retention systems and the key theory of excavation procedures and types of pile. From analysis of results of case studies it was found that FHWA approach is more safe and suitable practically for design of anchored piles.
