@article{Jim Shiau_Mathew Sams_Fadhil Al-Asadi_Mohammad Mirza Hassan_2017, title={STABILITY CHARTS FOR UNSUPPORTED PLANE STRAIN TUNNEL HEADINGS IN HOMOGENEOUS UNDRAINED CLAY}, volume={14}, url={https://geomatejournal.com/geomate/article/view/3200}, abstractNote={<p>This paper investigates the stability of plane strain tunnel headings in undrained soils. Using<br>the factor of safety approach via the strength reduction technique, the idealised tunnel heading models are<br>studied using the finite difference program FLAC. This problem is also similar to underground long wall<br>excavations in plane strain condition. The finite difference results are presented alongside upper and lower<br>bound limit solutions for validation. A thorough comparison between these two methods finds a very good<br>agreement. Design charts are presented for a wide range of practical scenarios using dimensionless ratios,<br>similar to Taylor’s design charts used for slope stability. Typical examples are presented to illustrate the<br>usefulness for practising engineers.</p>}, number={41}, journal={GEOMATE Journal}, author={Jim Shiau and Mathew Sams and Fadhil Al-Asadi and Mohammad Mirza Hassan}, year={2017}, month={Oct.}, pages={19–26} }