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The design of the Park River Auxiliary Tunnel is reviewed. The tunnel is a 2800 m (9100 ft) long, 6.7 m (22 ft) inside diameter inverted siphon-shaped tunnel constructed to bypass flood water beneath the city of Hartford, Connecticut, and transmit it directly to the Connecticut River. The tunnel was designed by and constructed for the New England Division of the U.S. Army Corps of Engineers. The approach selected for design consisted of a rational evaluation of recommended supports and rock load heights as determined from two rock mass classification design systems. Rock load heights predicted by the two classification systems were cross checked with a discrete element numerical model. The three-tiered approach of checks and balances incorporated into the design of the Park River Auxiliary Tunnel resulted in significant cost savings in final support. A comparison is also made between support requirements recommended by two additional classification systems.
tunnel design, classification systems, Q, -System, Geomechanics System, Modified Terzaghi's Method, RSR Concept
Nicholson, Glenn A.
Research Civil Engineer, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS