Evaluation of the geological condition ahead of the tunnel face by geostatistical techniques using T.pdf

Tunnelling and Underground Space Technology 18 (2003) 213–221
Evaluation of the geological condition ahead of the tunnel face by
geostatistical techniques using TBM driving data
Takuji Yamamotoaa , Suguru Shirasagi, *, Shinya Yamamotobbb , Yoshitada Mito , Kenji Aoki
aDepartment of Civil Engineering, Kajima Technical Research Institute, Tokyo 182-0036, Japan
bGraduate school of Engineering, Kyoto University, Kyoto 606-8501, Japan
Abstract
In tunnel excavation by Tunnel Boring Machine (TBM), it is difficult to grasp the ground condition ahead of and surrounding
the tunnel face because the face cannot be observed during tunnel driving. This is the reason why it has not been possible to
make the best use of high-speed excavation capability of the TBM, especially in ground plex conditions. Thus, the
TBM Excavation Control System was developed to realize the accurate prediction of the geological condition ahead of and
surrounding the tunnel face simultaneously with excavation. The special feature of this system is that geostatistical techniques are
introduced into the data analysis using both drill logging data from pilot boring and TBM driving data obtained during excavation,
in order to improve the precision of the ground mapping.
ᮊ 2003 Elsevier Science Ltd. All rights reserved.
Keywords: Tunneling; TBM; Geostatistics; Navigation system
1. Introduction of a