都市トンネル掘削に伴う地盤改良の設計

抄録

Jet grouting was applied in the diluvial sandy deposit with high artesian head, as an improving measure on constructing the electric transmission line tunnel in a maner of New Austrian Tunneling Method. The authors have made an analysis based on 2-dimension finite element method for zoning the improvement. The paper mainly refers to the results that the analysis clarifies the plastic zone and the targeted zone to be improved as well. The set-up of larger diameter in an improved soil column than ever has enabled us to expect a shorter period and the cost-effctiveness of the construction accordingly.