トンネル(5)

[III-226] Sharing of geological characteristics in ahead of the tunnel face by 3D visualization of non-core drilling results

〇ITABA KENTA¹, Kenichi Nakaoka¹, Atsushi Kuge¹, Yosuke Inoue¹, Takeshi Tanba² (1.OBAYASHI CORPORATION Technical Research Institute, 2.Ninistry of Land, Infrastructure, Transport and Tourism)

Keywords:Mountain Tunnel, Prediction Ahead of the Tunnel Face, Non-core Drill Logging, Gaussian Process Regression, Three-Dimensional Visualization

Interpolating program to visualize the results of three or more non-core drilling logs have been developped, and, it was tried at mountain tunnel sites. The 3D contour of the "Normalized Drilling Vellocity Ratio" made it possible to easily find the low strength region, and to share information on danger parts among construction workers. Also, it became clear that 3D contour of the rock mass classification can be used as a consultation material for the support pattern in ahead of tunnel face. As a result, the usefulness for safety management and assisting the selection of support was confirmed.