A STUDY ON THE EFFECTIVENESS OF GROUND SUPPORT ON ADVANCING DRIFT AS AN AUXILIARY CONSTRUCTION METHOD IN SQUEEZING ROCK

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  • 膨張性地山における導坑の適用性に関する実験的研究
  • ボウチョウセイ ジヤマ ニ オケル ドウコウ ノ テキヨウセイ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

The advancing drift constructed in squeezing rock is frequently expected to be effective in ground support by stabilizing the face and reducing the earth pressure acting on the support measure when the main tunnel is excavated. This effect is called as “inashi” effect. This study regarded advancing drift as an auxiliary construction method for closing the ground ring early. The advancing drift was installed in five different patterns including a case of no drift, with varying the length, shape of the drift, and support stiffness. The results show that the advancing drift may be used to stabilize the face, reduce displacement, and support the ground. It was confirmed that the advancing drift is effective in reducing the effects mainly by reducing displacement but is no so effective in reducing earth pressure.

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