Impact of Geotechnical Engineering on Infrastructure Lifespan and Maintenance Costs

Aim: To examine the impact of geotechnical engineering on infrastructure lifespan and maintenance costs. Problem Statement: The roles of geotechnical engineering in civil engineering infrastructures cannot be underestimated. It cuts across sub-divisional professions such as structural engineering, geology, mechanical engineering, construction engineering, environmental engineering, hydraulic engineering and so on. However, the study has great influence on the lifespan of infrastructure and their maintenance costs. Thus, more studies and literature surveys are still needed to reveal crucial information to geotechnical engineers, government, private sectors and related organizations. Significance of Study: This technical review critically examines the need to study the influence of geotechnical engineering on infrastructure lifespan and maintenance costs. Methodology: Recent relevant published articles, books and journals in the area of geotechnical engineering in relation to its impacts on the lifespan of infrastructure and their relevant maintenance costs were consulted. Discussion: In this technical review paper, the fundamental knowledge of geotechnical engineering and its interrelationship with infrastructure lifespan and their maintenance costs was examined. Applications of geotechnical engineering in relation with practicing fields were listed to include underground structures, roads and airports, supporting ground structures and excavations, subgrades and ground structures, foundation engineering and assessments of slope stability. Infrastructure life cycle was stated to comprise of four phases which include planning, preparation, procurement and implementation. Reference was made to a study on the effects of geotechnical risks on cost and schedule in infrastructure projects. It was concluded that slope Instability was the most significant risk factor based on both cost and schedule impacts having mean values of 3.06 and 3.02 respectively with reference to the survey results achieved from 47 professionals in the construction industry. The findings were recommended for governmental agencies and industry professionals whose professionalism is into infrastructure projects in order to recognize how geotechnical conditions influence time and cost overruns. Conclusion: Geotechnical engineering has great influence on the lifespan of infrastructure and their maintenance costs.