Adaptive Engineering. Innovative Solutions.
Subsurface & Tunnel Engineering LLC (STE) specializes in the planning, design, and management of heavy civil tunnel and underground projects, including transportation, transit, water, wastewater, and mining developments. The practice combines extensive field experience with advanced engineering techniques and numerical modeling to provide optimum structural and geotechnical solutions. Its adaptive engineering approach allows clients to seamlessly accommodate evolving conditions throughout the duration of underground construction projects.
Mohamed YounisPrincipal
Specialized engineering services for heavy civil and underground construction projects, providing adaptive solutions to address complex ground conditions and structural challenges.
Analytical and design support for new excavations and the rehabilitation of existing underground structures, utilizing advanced techniques such as tunnel boring machines and sequential excavation methods.
Evaluation and implementation of trenchless methods, including microtunneling, pilot tube, horizontal directional drilling, and jack-and-bore techniques.
Engineering of excavation support systems, such as soldier piles, diaphragm walls, secant pile walls, and rock shaft initial support systems.
Two-dimensional and three-dimensional structural and geomechanical numerical modeling to simulate underground behavior and structural responses.
Structural condition surveys, construction impact assessments, and the design and installation of geotechnical monitoring instrumentation.
Comprehensive subsurface investigations and design services to ensure foundation stability and manage complex soil and rock behaviors.
Geotechnical characterizations and the preparation of comprehensive Geotechnical Data Reports and Geotechnical Baseline Reports.
Engineering analysis and structural design for shallow and deep foundation systems to support heavy civil structures.
Methods to modify soil properties and manage groundwater flow, including grouting, dewatering, and ground stabilization techniques.
Structural design and analysis for underground infrastructure elements, ensuring long-term durability and safety.
Engineering of concrete and steel lining solutions, including segmental linings, shaft concrete linings, and steel liner plates.
Structural design of temporary construction elements, such as utility support systems and heavy traffic decking for urban projects.
Detailed design of individual structural members and load-bearing components required for complex civil works.
Professional advisory services spanning the planning, procurement, construction, and post-construction phases of major infrastructure assets.
Planning-phase guidance, value engineering, contract document preparation, and evaluation of diverse delivery methods like Design-Build and CMAR.
Construction monitoring services, submittal reviews, schedule evaluations, and field oversight to ensure contract compliance.
Investigative and forensic analysis, contract claim reviews, dispute resolution support, and expert witness services.
Infrastructure · Mining · Stormwater & Flood Control · Transit · Transportation · Tunnels · Wastewater · Water Supply
Babylon, NY · Wastewater · Client: Suffolk County
This replacement project involved the design of a temporary flood control system, pipe jacking, transition pipe, and a tunnel precast concrete segmental lining, along with tunnel boring machine face pressure evaluation and construction support services.
Los Angeles, CA · Transit
This transit corridor project involved temporary support of excavation design, traffic deck design, utility support and hanging design, ground improvement, groundwater control, evaluation and assessment of instrumentation data, and construction impact assessments on existing structures.
Lake Buena Vista, FL · Wastewater
This sanitary sewer pipeline project involved launching shaft design and groundwater control services.
Washington, DC · Tunnels
Work on this major tunnel project included construction impact assessments, evaluation and protection of existing structures, pre- and post-construction condition evaluations, independent design reviews, and tunnel connection design.