Abstract
Existing risks in deep foundation excavation projects is a major issue in developing cities. With the rapid in-crease in the number of various deep foundation and excavation projects in big cities of Iran, many accidents related to deep excavation have been reported every year. These accidents affected delay and increased cost of project implemen-tation. Therefore identification and assessment of risks of these accidents is essential. The aim of the research was to develop a framework to overcome limitations of previous approaches to assess of risks in excavation projects. According to the complexity of a problem and the inherent uncertainty, the framework adopted SWARA (Step-wise Weight As-sessment Ratio Analysis) and COPRAS (COmplex PRoportional ASsessment) methods through introducing new criteria for risk assessment. Data was collected through interview, a literature review and a questionnaire survey distributed to excavation project experts. A case study of deep foundation excavation in Shiraz was presented. The results have shown that the risks involving construction safety, unfavourable geological conditions, shortage of managerial experience, in-complete emergency plan and subsidence of ground are the most significant risks excavation projects in Shiraz. The proposed framework and the obtained results can help stakeholders of excavation projects in developing countries better to manage project risks.
Highlights
Civil construction projects are a mainstay of industries in national economy of Iran as the rapid development of urbanization and the shortage of urban space spurred by the need to build high-rise buildings, subways, tunnels, underground utilities networks, etc. has increased
This paper introduced a developed new framework for ranking risks in excavation projects by Step-Wise Weight Assessment Ratio Analysis (SWARA)-COPRAS method
The weights of these criteria were obtained from SWARA method
Summary
Civil construction projects are a mainstay of industries in national economy of Iran as the rapid development of urbanization and the shortage of urban space spurred by the need to build high-rise buildings, subways, tunnels, underground utilities networks, etc. has increased. Excavation projects have become one of the important and challenging issues (Feng, Jun-yan 2011). There are many high risk factors in the construction industry such as deep excavation projects with attention to poor operating conditions compared to various industries (Hong et al 2013). Accidents in deep excavation have caused property loss, personal injury, and damage to the surrounding environment. Several excavation projects have collapsed (Feng, Jun-yan 2011). For example the Hangzhou Xianghu Station in Metro Line 1 collapsed during construction on 2008, resulting in serious economic losses of more than 50 million Renminbi (Wang 2008), 24 injuries and 21 deaths (Zhang, Li 2008). The excavation of the Mass Rapid Transit Circle Line adjacent to Nicoll Highway in Singapore collapsed in 2004 (Chiew, Yu 2006)
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