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Seismic tomography investigation in 140m Gallery in the Horonobe URL project

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Abstract

The Japan Atomic Energy Agency (JAEA) established the Horonobe Underground Research Laboratory (URL) Project at Horonobe, in Hokkaido, Japan to enhance reliability of nuclear waste disposal technologies to be developed in deep sedimentary environments. JAEA has undertaken a number of in-situ experiments to determine changes in the properties of the host rock and the extent of the excavation disturbed zone (EDZ) created by the excavation of underground galleries for the disposal of radioactive waste. This paper reports a seismic tomography survey (using a hammer seismic source) of the “140m Gallery” at a depth of 140m below the surface of the Horonobe URL. The observation area was 3m square on the horizontal plane along the sidewall of the 140m Gallery. The measurement was repeated with the progress of excavation of a tunnel. In this experiment, the distribution of seismic velocity in the rock around the new tunnel and its decrease as the tunnel was dug, were observed using a simple small-scale seismic tomography system. The data collected show that this system can be used to capture the EDZ around tunnels.

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Authors and Affiliations

  1. Horonobe Underground Research Center, Japan Atomic Energy Agency, Hokushin 432-2, Horonobe, 098-3224, Hokkaido, Japan

    Yutaka Sugita, Takahiro Nakamura & Hiroyuki Sanada

  2. Suncoh Consultants Co., Ltd., 1-8-9, Kameido, Koto-ku, 136-5882, Tokyo, Japan

    Takao Aizawa & Shunichiro Ito

Authors
  1. Yutaka Sugita
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  2. Takahiro Nakamura
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  3. Hiroyuki Sanada
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  4. Takao Aizawa
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  5. Shunichiro Ito
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Sugita, Y., Nakamura, T., Sanada, H. et al. Seismic tomography investigation in 140m Gallery in the Horonobe URL project. MRS Online Proceedings Library 1265, 603 (2010). https://doi.org/10.1557/PROC-1265-AA06-03

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  • DOI: https://doi.org/10.1557/PROC-1265-AA06-03

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