山岳トンネル(11)

[VI-684] INITIAL DISPLACEMENT MONITORING AND ITS APPLICATION TO TUNNEL EXCAVATION WITH HIGH OVERBURDEN

〇Takeshi Sato¹, Fumiharu Nakahara², Tomoyuki Aoki², Kiyoshi Kishida³ (1.Central Japan Railway Company, 2.Taisei Corporation, 3.Kyoto University Faculty of Engineering)

Keywords:High Overburden, Tunnel Displacement Monitoring, Initial Displacement, Prediction of Final Displacement, 1 Cycle

Tunnel displacement monitoring has shown to provide valuable information for evaluating or predicting ground conditions near tunnel face as well as information for assisting decision-making to select and apply proper tunnel support system during excavation. This feature might serve well even for high overburden tunneling, where little geotechnical information could be available in advance of excavation. This paper presents practical method of predicting final tunnel convergence from initial few displacement readings: finding relationships between the initial and the final displacement.