The Use of Numerical Analysis in Rehabili tation of Baltimore Howard Street Tunnel
This paper discusses the use of numerical modeling for optimization of tunnel rehabilitation scheme to improve the clearance of the Howard Street Tunnel in Baltimore, MD. With a total length of approximately 8,700 feet, the Howard Street Tunnel consists of three sections: concrete box section, original cut-and-cover section, and original mined section. The Howard Street Tunnel currently has a minimum vertical clearance of 4-’19” but a vertical clearance of 0-’21” should be achieved by lowering the track profile and/or structural modifications. Finite element modeling was used to determine the maximum allowable depth of cut in the brick arch at the cut-and-cover and mined sections of the tunnel. The results of these analyses allowed the designers to formulate a cost-effective solution which minimized the risk of compromising the structural integrity of the tunnel.Howard Street Tunnel, Tunnel rehabilitation, Numerical analysis.