Sara Bayandor, Roohollah Kalatehjari, Reza Akherati and Jalal Kasebzadeh
Through a case study for Iran, this research seeks to pinpoint the dominant causes of delay and cost overruns in two standard Support of Excavation methods (Bracing strut and…
Abstract
Purpose
Through a case study for Iran, this research seeks to pinpoint the dominant causes of delay and cost overruns in two standard Support of Excavation methods (Bracing strut and top-down construction) in deep excavation projects from various points of view involving contractors, consultants and owners. This investigation identifies the root causes, compares them with existing literature to find similarities and differences with tunnelling and construction projects and proposes practical solutions.
Design/methodology/approach
The primary factors were identified after an extensive literature review and expert interview. Subsequently, a questionnaire was designed to classify related factors, considering impact indices, occurrence likelihood and overall significance. Eventually, the findings of the analysis were visually represented through cause-and-effect diagrams.
Findings
The results indicate that “inflation and exchange rate fluctuation” is the top-rated cause, followed by designers’ limited overall perspective of implementation issues. Also, comparing the roles of related teams shows that the contractor sector is the most responsible for delay and overruns in both methods. Finally, practical solutions are presented regarding the main affecting factors.
Originality/value
Prior research often addresses delay and costs in construction, but insufficient focus is given to deep excavation projects, particularly in Iran. This study not only fills the identified knowledge gap but also delves into the causes of delay, pursued until the fourth bone in some cases and proposes a solution framework derived from previous research, case studies and expert insights to mitigate construction delay.
Details
Keywords
This paper aims to examine how different contextual contingency factors and organizational goals influence construction clients’ decision-making when procuring contractors in the…
Abstract
Purpose
This paper aims to examine how different contextual contingency factors and organizational goals influence construction clients’ decision-making when procuring contractors in the housing sector. More specifically, it investigates how clients’ choice of procurement strategies and organizational control systems is contingent upon various contextual factors and organizational goals.
Design/methodology/approach
It is based on an explorative interview study of clients and contractors in the Swedish housing sector underpinned by a review of organizational control literature.
Findings
The client's knowledge and resources, as well as project complexity and uncertainty, are the most important contextual contingency factors, while property management and sustainable development are the most important organizational goals that housing clients consider when designing procurement strategies.
Research limitations/implications
The paper contributes to the understanding of how construction clients choose procurement strategies, by providing new insights into effects of the mentioned contextual contingency factors and organizational goals on clients’ choice of control systems through their procurement strategies.
Practical implications
Property owners who continuously procure housing projects with sustainability requirements and high degrees of complexity and uncertainty should develop knowledge and resources related to their client role, to enable the design and implementation of appropriate procurement strategies.
Originality/value
Novel aspects of the paper are the demonstration of the value of a holistic approach, considering both contextual contingency factors and organizational goals, when selecting control systems and explicit discussion of how the client's knowledge and resources influence possibilities to implement different control systems.