Testing and Evaluating of Prototype Tunnel Support Systems.

摘要

The report presents the results of engineering studies related to the development of new and improved tunnel support systems. Steel fiber reinforced regulated-set concrete has been proposed for use as a slipformed concrete lining which can be placed immediately behind a tunnel boring machine. Mix design studies and field pumping tests for this new concrete are described. The results of a cooperative research effort carried out with the U.S. Bureau of Reclamation on precast polymer concrete segmented tunnel support systems include an evaluation of the structural aspects of the system,an analysis of potential heat and fire hazards,and an evaluation of the cost of the promising new support system. (Modified author abstract)