Abstract: In an attempt to mitigate engineering safety problems caused by inappropriate construction methods in tunnel construction, an optimization model for tunnel construction method is established based on grey fuzzy multi-attribute group decision-making. The attributes of construction method include construction environment, economic benefit, complexity of construction techniques, construction progress, and mechanized degree. The feasibility of the model is verified by a practical application to the Mila mountain tunnel of Linzhi-Lhasa highway in Tibet. The model could well reflect the emphasis of expert group on different attributes, quantify the decision process, and is proved practical.

Key words: tunnel engineering, construction method, optimization, grey fuzzy number, multi-attribute group decision-making, entropy weight