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Job Description:
Principal Tunnel Geotechnical Engineer
Dubai, UAE
Parsons is looking for an amazingly talented Principal Tunnel Geotechnical Engineer to join our team! In this role you will take technical ownership of the geotechnical and tunnelling engineering of the Airport Express Line and other high-profile rail, bridge and marine programmes — leading the design of large-diameter TBM tunnels, mined crossover caverns and deep station excavations , setting the ground investigation strategy that underpins them, and playing your part in the development of the City's infrastructure for the 21st Century.
What You'll Be Doing:
Tunnel and Geotechnical Design Leadership:
Leading the geotechnical design of large-diameter (D > 10 m) TBM tunnels, including the TBM crossover caverns at rail junctions — ground treatment and pre-support, temporary and permanent support design, and excavation sequencing (SEM/NATM) of cavern and enlargement works.
Leading deep excavation (> 30 m) methodology studies for stations, shafts and cross-passages — comparison and selection of retention systems (diaphragm wall, secant pile, top-down), base stability, dewatering and groundwater control, and the resulting construction methodology.
Directing building and utility damage assessment for third-party structures adjacent to the alignment — volume loss and settlement prediction, Stage 1 to Stage 3 damage risk assessment, protective and mitigation measures, and instrumentation & monitoring with trigger levels and response plans.
Predicting advance and production rates for large-diameter TBM drives, and forecasting cutter intervention frequency and location — including hyperbaric versus atmospheric intervention strategy, ground treatment at intervention points, and the effect of abrasivity, mixed-face and boulder conditions on the programme.
Owning the numerical modelling strategy (2D/3D finite element and finite difference — PLAXIS, FLAC/FLAC3D, MIDAS GTS or equivalent), soil-structure interaction, groundwater and seismic assessment, and technically reviewing the team's analyses.
Ground Investigation and Geotechnical Reporting:
Collecting, reviewing and interpreting existing and historical ground investigation data from adjacent and previous projects, and producing the project Geotechnical Interpretative Report (GIR), the geotechnical design parameters and, where required, the Geotechnical Baseline Report (GBR).
Defining the ground investigation requirements for new projects — scope, technical specification, borehole layout and depths, in-situ and advanced laboratory testing schedules and geophysical surveys — and preparing the associated tender documents and technical evaluation.
Managing the ground investigation programme from procurement to close-out: supervision of the GI contractor, factual report review, schedule and budget control, and timely integration of the results into the design.
TBM Operations and Constructability:
Carrying out and documenting TBM optioning studies — machine type (EPB / slurry / variable density / hybrid), diameter, cutterhead and cutting tool configuration, back-up arrangement and segmental lining — with a clear and auditable basis of selection.
Developing the TBM procurement and manufacturing plan (technical specification, manufacturing and factory acceptance programme, delivery and assembly schedule) together with the segment casting yard and site establishment plan.
Preparing and documenting tunnelling logistics plans — launch and reception shafts, muck haulage and disposal, slurry treatment and separation plant, segment…