3D NUMERICAL MODELLING OF SHALLOW TUNNEL IN WEATHERED GRANITE INCORPORATING MULTI-STAGE EXCAVATION AND PRE-SUPPORT

Authors

  • Sarder M. Yahya Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
  • Rini A. Abdullah Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
  • Mohd Ashraf Mohamad Ismail School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia
  • Hisham Mohamad Civil and Environmental Engineering Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
  • Muhammad Azril Hezmi Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
  • Siti Norafida Jusoh Department of Geotechnics and Transportation, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia

DOI:

https://doi.org/10.11113/jt.v78.9637

Keywords:

Shallow tunnel, weathered granite, tunnel pre-support, finite element analysis

Abstract

Generally tunnelling in urban ground condition is not always favourable due to the tunnels’ susceptibility to major displacement especially when excavated in the soft soil and/or weak weathered rock formation. Apart from conventional support systems, pre-support measure like forepoling umbrella arch is frequently used to reinforce the ground. Modern computational tools allows the inclusion of multi-stage excavations and pre-support which was not possible in two dimensional (2D) plane strain. This paper demonstrates the three dimensional (3D) finite element analysis of Pahang-Selangor raw water transfer tunnel, as a reference case, where multi-stage excavation and pre-support are incorporated as intrinsic part of the model. The New Austrian Tunnelling Method (NATM)-3 segments which encountered Grade III weathered granite, having shallow overburden cover, was selected for numerical analysis using RS3 software. Comparison between simulated and observed data has shown good agreement during verification

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Published

2016-08-30

Issue

Vol. 78 No. 8-6: Geoengineering

Section

Science and Engineering

License

Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.

How to Cite

3D NUMERICAL MODELLING OF SHALLOW TUNNEL IN WEATHERED GRANITE INCORPORATING MULTI-STAGE EXCAVATION AND PRE-SUPPORT. (2016). Jurnal Teknologi, 78(8-6). https://doi.org/10.11113/jt.v78.9637