On the Estimation of Tunnel Wall Displacement during Excavation

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  • トンネル掘削にともなう内空変位の予測　　第三白坂トンネルＮＡＴＭ試験施工
  • トンネル クッサク ニ トモナウ ナイ クウヘンイ ノ ヨソク ダイ サンパク
  • 第三白坂トンネルNATM試験施工

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It is one of the most important problem for tunnel construction to estimate the final amount of rock deformation.<BR>This paper deals with the estimation of the final amount from the amount of deformation in the earlier stage of measurements at Dai-Sau-Shirasaka Tunnel which is under construction with the New Austrian Tunnelling Method.<BR>We have distinctly found that the rock behavior after excavation is constituted with viscous and plasticelastic deformations in adopting new measurement method described in this paper.<BR>Rock deformation U can be expressed by the following equations, <BR>U=UV+UEP<BR>UV=a·t<BR>UEP=C (1-e-D. L)<BR>where, UV: viscous deformation<BR>UEP: plastic elastic deformation<BR>t: elapsed time after blasting<BR>L: distance between the observation point and tunnel face<BR>a, C, D: constants

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