Basic Ideas on Countermeasures of Mountain Tunnel Deformation due to Earth Pressure

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  • 地圧の作用による山岳トンネルの変状対策のあり方
  • チアツ ノ サヨウ ニ ヨル サンガク トンネル ノ ヘンジョウ タイサク ノ アリカタ

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Abstract

 It is important to establish a planning and design method of countermeasures for existing mountain tunnels in service deformed by earth pressure, in order to perform maintenance management of tunnels pertinently.<br> This paper discusses basic ideas on countermeasures for the mountain tunnels deformed by plastic earth pressure and loosening vertical earth pressure as follows ; 1) case studies on railway tunnel deformation due to plastic earth pressure and loosening vertical earth pressure ; 2) evaluation of deformation behavior of the various tunnel lining structures by two kinds of tunnel loading experiments ; 3) development of a numerical prediction method of tunnel deformation using a time-dependent ground strength reduction method ; 4) recommendation of necessity to examine tunnel deformation mechanism from an engineering geological view.

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