Geotechnical Discussion on the Mechanism of Rock Block Failure Occurred above Toyohama Tunnel, Route 229.

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  • KIKUCHI Kohkichi
    Resources Engineering, Graduate School of Engineering, Kyoto University
  • MITO Yoshitada
    Resources Engineering, Graduate School of Engineering, Kyoto University

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  • 国道２２９号線豊浜トンネル上部斜面の岩盤崩落メカニズムに関する地質工学的考察
  • コクドウ 229ゴウセン トヨハマ トンネル ジョウブ シャメン ノ ガンバン

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Description

The large rock block failure had been occurred on the rock slope above the west side entrance of Toyohama Tunnel, Route 229, located in the west coast of Hokkaido, Japan, at about 8 : 10 a. m. on 10 February 1995. The mechanism of the rock block failure is discussed with several facts concerning geotechnical characteristics of the field and natural conditions around the field, especially the seasonal change of groundwater behavior, based on the results of field observations, field tests, laboratory tests and field measurements. In conclusion, the main factor of the rock block failure is considered as what the hydro-mechanical pressure, occurred by the phenomenon that groundwater had been sealed by the ice lens on the slope under extreme low temperature condition, has been applied to the discontinuity behind the rock block.

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