Japan Society of Civil Engineers 2019 Annual Meeting

Presentation information

第VI部門

山岳トンネル (12)

Wed. Sep 4, 2019 8:40 AM - 10:10 AM VI-12 (幸町総合教育棟 第31大講義室)

座長:嶋本 敬介(鉄道総合技術研究所)

[VI-458] Estimation of Compressive Strength in the Ground Ahead of Tunnel Face Using Damping Pressure Pulsation of Hydraulic Rock Drill

*塚本 耕治1、小泉 匡弘2、進士 正人3 (1. (株)奥村組、2. 古河ロックドリル(株)、3. 山口大学)

Keywords:Hydraulic Rock Drill, Dumping Pressure, Pressure Pulsation, Uniaxial Compressive Strength

Focusing on the fact that repulsive force of ground is absorbed by the damping pressure in hydraulic drifter when excavating the ground using a rock drill, we carried out drilling experiment using specimens with known compressive strength. It was shown that there is a correlation between the pulsation amplitude of the damping pressure and compressive strength. We proposed "normalized damping pressure pulsation amplitude" where pulsation amplitude of damping pressure is divided by percussive pressure as an index for ground evaluation. We confirmed that the index has better correlation with compressive strength, and showed that the index is effective for predicting the strength of ground.

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