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  Multi-Dimensional Evaluation of Tunnelling Pre-Grouting Methodology Based on Excavation and Overhead Costs Considering Environmental Aspects

  Population increases and cities developments forced the governments to investing on the undergrounds structures such as buried buildings and tunnels. However, tunnels are complicated structures that their constructions accompany with several difficulties including ground settlements, water ingress, environmental problems, costs, excavation hazards and several executive difficulties. One of the challengeable points in the tunnelling projects is achieve to an optimize framework to consideration all effective parameters. In this paper, using real data and by considering effective parameters, the relationships among these significant factors were evaluated. The performed multidimensional analyses are based on a pre-grouting methodology to control the water ingress in tunnel. The headrace tunnel in Uma Oya project located in Sri Lanka is considered as a case study. Based on the obtained results the monthly excavation rate in dry and wet conditions has been optimized.

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