Principalsupervisor Dr. Zili Li at University College Cork, Ireland and co-supervisor:Prof. Kenichi Soga at UC Berkley, US.
If interested, please feel free to sendyour CV to
Salary:53k ~ 59k euros per year
Candidates should have a PhD degree in Geotechnical /Geological / Tunnelling engineering or will obtain one in a few months. Candidateswith background in tunnel engineering and numerical modelling are encouraged toapply, while English certificate (e.g. IELTS / TOEFL) and internationalresearch experiences are highly appreciated.
Postdoctoral Position to besupervised by Dr. Zili Li
Theworld-famous Large Hadron Collider (LHC) particle accelerator is housed tens ofmetres below the ground surface in a large-scale underground tunnel network atthe European Centre for Nuclear research (CERN). Hundreds of miles of deep CERNtunnels were excavated decades ago lined with spray shotcrete in a weaksedimentary rock called the red molasse, which is a type of highly heterogeneous rock mass comprisingan irregular, alternating sequence of sandstones and marls with distinctlydifferent mechanical properties. Such complexground condition may result in significant bending moment in the tunnel lining andconsequently lead to cracks, water infiltration and other structural distressyears after tunnel construction.
In this study, a series of soil-fluid coupled finiteelement analysis was conduct to investigate the long-term behaviour of CERNTunnel: TT10 in the molasse region. For simplicity, the tunnel behaviour was investigatedin 2D plane strain condition at a representative transverse cross section. The horseshoetunnel cross section was modelled using 8-node quadratic elements with localmesh refinement, whilst engineering properties of different layers ofsandstones, marls and other rocks surrounding the tunnel were considered with aparticular interest in ground permeabilities. Results show that the tunnellining permeability relative to the surrounding rock plays an important role onthe tunnel deformation mode during long-term ground consolidation afterconstruction. In particular, the ground permeability anisotropy in the complexmolasse region greatly affects the earth pressure distribution on the tunnellining and hence results in critical tunnel damage (e.g. cracks and heaving atthe tunnel invert). The consolidation-induced structural damage in turn createsnew local seepage path around the tunnel circumference for continuous waterinfiltration and exacerbates further tunnel distress with time.