The WMATA E2C, E3B, and E4B projects include twin 20 foot diameter subway tunnels in soft flowing ground.
Portal with drainage flows.
Deere & Ault Consultants, Inc. staff provided a pre-bid analysis of the tunnel alignments, and consulting services for one of the contracts. Our services included mapping the geologic conditions as they were encountered, and conducting a soil exploration and laboratory testing program ahead of the digger shield.
Deere & Ault’s staff also advised the contractor on dewatering methods, the effectiveness of chemical grouting, and geologic conditions that required special consideration.