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Application of Specific Energy in Evaluation of Geological Conditions Ahead of Tunnel Face

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Title: Application of Specific Energy in Evaluation of Geological Conditions Ahead of Tunnel Face
Authors: Liu, Jiankang / Sakaguchi, Osamu / Ishizu, Sodai / Luan, Hengjie / Han, Wei / Jiang, Yujing
Issue Date: 18-Feb-2020
Publisher: MDPI
Citation: Energies, 13(4), art.no.909; 2020
Abstract: In underground construction, especially tunnel building, a detailed knowledge of the geological conditions ahead of the tunnel face is essential for both safety and efficiency of work. Many tunnel collapses have been reported to occur because of a lack of accurate evaluation of the geological conditions. While conventional horizontal boring conducted from a tunnel face provides good accuracy, it is infrequently conducted due to its high cost and time-consuming nature. In addition, the tunnel seismic reflection method has limited practicality owing to the complexity of data processing. This paper presents a new approach based on the specific energy of the mechanical drilling rig to evaluate the geological conditions ahead of the tunnel face. In order to assess the geological conditions, rock mass quality index, buried depth of the tunnel and tunnel deformation investigation were undertaken, and the obtained data were compared to the specific energy. Results from the comparison reveal the evaluation criterion that if the distribution of specific energy in some areas deviates from the distribution of buried depth, it is considered that abnormal geological conditions exist in this area. This work can greatly contribute to the accurate and effective evaluation of the geological conditions ahead of the tunnel face.
Keywords: specific energy / tunnel building / tunnel face / geological conditions / rock mass quality / tunnel deformation
URI: http://hdl.handle.net/10069/39728
DOI: 10.3390/en13040909
Rights: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open acces article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).              
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/39728

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