Evaluation of geological conditions ahead of a tunnel face using the Tunnel Seismic Prediction method (TSP) – Lesson learned from the Pahang-Selangor raw water transfer tunnel, Malaysia

M. A. M. Ismail, R. Azit, S. M. Ng, H. Zabidi, N. Bakhudin, Z. Nordin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this study, Tunnel Seismic Prediction method (TSP) was used to predict the geological condition ahead of the tunnel face. The tunnel which extends 44.6 km is intersected by several major faults and few lineaments. The ability of the TSP system was investigated to predict one the anticipated fault which had been inferred from the geological map. Then, the TSP results were applied to delineate the relation between seismic velocities and geological parameters for the predicted fault ahead of the tunnel face. The results show a velocities drop 10 to 40 m ahead of the tunnel face which had indicated the initial findings of the unfavorable geological condition from geological map. From the verification analyses, the TSP results are substantially correlated with the Tunnel Boring Machine (TBM) driving data, geological mapping, rock class grade point and uniaxial compressive strength obtained using Rock Schmidt Hammer. In this case, the TSP was a helpful tool for the tunnel contractor in predicting zones of geological instabilities during the excavation process of long deep tunnel. Thus, such prediction method can be used as a decision support in the observational design and construction system especially in determining suitable tunnel support system in the expected unfavourable geological conditions.

Original languageEnglish
Title of host publicationISRM International Symposium - EUROCK 2013
Editors Lydzba, Kwasniewski
PublisherInternational Society for Rock Mechanics
Pages901-907
Number of pages7
ISBN (Print)9781138000803
Publication statusPublished - 2013
EventISRM International Symposium 2013 - Wroclaw, Poland
Duration: 23 Oct 201326 Oct 2013

Conference

ConferenceISRM International Symposium 2013
Abbreviated titleEUROCK 2013
CountryPoland
CityWroclaw
Period23/10/1326/10/13

ASJC Scopus subject areas

  • Geochemistry and Petrology

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    Ismail, M. A. M., Azit, R., Ng, S. M., Zabidi, H., Bakhudin, N., & Nordin, Z. (2013). Evaluation of geological conditions ahead of a tunnel face using the Tunnel Seismic Prediction method (TSP) – Lesson learned from the Pahang-Selangor raw water transfer tunnel, Malaysia. In Lydzba, & Kwasniewski (Eds.), ISRM International Symposium - EUROCK 2013 (pp. 901-907). International Society for Rock Mechanics.