Anacostia River Tunnel Project
TYLin provided the detailed design for portions of the Anacostia River Tunnel (ART) project, a vital component of DC Water’s Clean Rivers Program in Washington, DC.
The ART Project is a cornerstone initiative to mitigate combined sewer overflows into the Anacostia River, Potomac River, and Rock Creek within the District of Columbia. This extensive infrastructure network and support program was designed to efficiently collect and treat water during heavy rainfalls before reaching the rivers.
An essential project component involves a pipe-jacking tunnel connecting the main ART tunnel and drop shaft CSO-018. This connection features a 300-foot-long (91.44 meter) tunnel, driven through very stiff clay using the pressurized face method, with a groundwater pressure range of 2.5-3.0 bar.
TYLin was engaged in the detailed design process, focusing on microtunnel boring machine (MTBM) requirements concerning forecasted ground conditions. TYLin reviewed the slurry treatment plant and assessed the jacking force adequacy and potential for pipe breaking. As tunnel experts, we revised the overall work plan.