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結晶質岩における大深度立坑掘削を対象とした岩盤の変位・ひずみ計測

Measurement of the rock strain/displacement during deep shaft excavation in crystalline rock

平野 享; 松井 裕哉 ; 木下 晴信

Hirano, Toru; Matsui, Hiroya; Kinoshita, Harunobu

結晶質岩を対象に、大深度立坑掘削の周辺岩盤の変位・ひずみを計測し、立坑掘削で生じる周辺岩盤の全変形とその変化の挙動を把握することを試みた。具体的には立坑掘削前に計測用の横坑を用意し、そこから立坑の坑軸に沿うボーリング孔を設けて、孔内に埋設型ひずみ計や連続式傾斜計を設置し、切羽通過前後の周辺岩盤の変位・ひずみ変化を連続計測した。その結果、対象とした立坑との水平離隔0.2Dと1.2D(Dは立坑掘削径で5.3m)では、切羽通過での応力解放によるひずみ・変位の変化が明瞭に認められた。また立坑掘削による岩盤の損傷範囲は、立坑壁面から0.2Dには及ばないものと推定された。

We tried to understand the amount of the total rock deformation and the feature by the strain/displacement measurement during a deep shaft excavation in crystalline rock. For this purpose, the instruments were installed in the vertical boreholes drilled along a shaft before excavation. Then strain/displacement were measured during the excavation. As a result, the large strain/displacement by blasting were measured at 1 or 6 meter far from the shaft wall, Also, the rock behavior was estimated to be elastic approximately based on comparison between measured and theoretical value. Also, damage range of the rock caused by blasting was estimated less 1 meter far from the shaft wall.

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