About SUBSURFACE & TUNNEL ENGINEERING LLC
Subsurface Tunnel Engineering, LLC (STEng-llc) specializes in the planning, design, and management of heavy civil tunnel and underground projects, including transportation, water, wastewater, and mining. With over 30 years of experience, they provide innovative and adaptive engineering solutions across five continents.
Planning phase, preliminary design, value engineering/alternative design, detailed design, and contract document preparationDesign-Build, Design-Bid Build, P3, and CMAR servicesGeotechnical assessment, Geotechnical Data Report (GDR), Baseline Report (GBR), and foundation designSegmental lining design, tunnel and shaft concrete lining design, steel liner plate lining design, pipe jacking design, and traffic decking designTunnel analysis design, tunnel excavation and initial support (TBM, NATM/SEM, rock support), tunnel face pressure analysis, and tunnel advance rate analysisInspection/rehabilitation, groundwater control, ground improvement, and numerical analysis (2D and 3D structural and geomechanical modeling)Support of excavation design, soldier pile and lagging, deep soil mixing walls, cement bentonite walls, sheet piling, diaphragm walls, secant/tangent pile walls, and rock shaft initial support systemsTrenchless technology, including ground condition evaluation, microtunneling, pilot tube, HDD, Jack and Bore, jacking forces estimation, and backstop design
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