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  An integrated study on the stability and dynamic response of the Taru-Toge tunnel during excavation – Conventional Tunnelling Methods in Development and Use

  Taru-Toge tunnel is being constructed using drilling-blasting technique as a part of expressway project connecting Shin-Tomei Expressway and Chuo Expressway at the boundary of Shizuoka and Yamanashi Prefectures in the Central Japan (Figure 1a). The maximum overburden is about 400 m. The authors have been carrying out a monitoring program to measure multi-parameter and dynamic responses of tunnel during and soon after the blasting operations using a multi-parameter monitoring system (Acoustic Emissions (AE), Electric Potential (EP), Temperature (T), Humidity (H) and Air Pressure (P)) and stand-alone type compact accelerometers developed by one of the co- authors. The measured response involves dynamic vibrations caused by blasting as well as by stress-redistribution around the tunnel face. In this paper, the authors present the outcomes of this unique integrated study on the overall stability and dynamic response of the Taru-Toge tunnel during excavation and discuss their implications in actual applications.

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