14th International Congress on Advances in Civil Engineering, İstanbul, Turkey, 6 - 08 September 2021, pp.283-289
Many infrastructure projects face geotechnical risks which might have devastating effects on the cost and schedule performance of the projects if not managed properly. Since infrastructure projects have huge uncertainties in their nature, consideration of all possible geotechnical conditions becomes more compelling. Thus, the prioritization of geotechnical risks becomes an important element of effective risk management in infrastructure projects. To address this issue, this study aims to evaluate geotechnical risks that are likely to occur in infrastructure projects by using fuzzy technique for order of preference by the similarity-to-ideal-solution (TOPSIS), which is one of the most widely used multi-criteria decision making (MCDM) tools. Cost and schedule criteria were used to rank the geotechnical risks since they were mainly considered as main success criteria of projects. To achieve the study objective literature review was conducted and 27 geotechnical risks were determined. Then, questionnaire survey was performed with industry professionals from heavy civil construction sector in Turkey to prioritize predetermined geotechnical risks. The results indicate that i) soft clays, organic silts, or peat, ii) slope instability, and iii) settlement in general were the most significant geotechnical risks in infrastructure projects. Proposed approach can be used in infrastructure projects dynamically to develop effective risk mitigation strategies to ensure cost and schedule performance of the projects.