Constructability and Economical Comparison Between Two Proposed Permanent Shoring Systems in Qatar: A Case Study

Abstract

This paper introduces the constructability and economic feasibility study of using one of the proposed two types of permanent shoring system for a highway project in Qatar. The cast-in-situ cantilever retaining wall and the contiguous piles wall were suggested and designed to be used as a permanent retaining system at a multi-level intersection. In this study, the construction complexities of using the cantilever retaining wall system are illustrated and compared to the contiguous piles wall. Besides, the impact on the Right-of-Way (ROW) of the road, excavation process, traffic circulation, and existing utilities are discussed. The paper summarizes the difference in the required construction materials and excavation quantity for the proposed shoring systems at the same retained elevation. Furthermore, the design of both systems is performed based on the local andinternational guidelines and regulations of the shoring system design in Qatar. The studyhas shown that both suggested systems are providing the same finishing quality while thecontiguous piles system is more effective in minimizing economic and site preparationchallenges. It also provides safer utilities handling and faster construction sequencingwithout cost increases.