UMTA TRIES TO DIG OUT FROM BURDEN OF RISING TUNNEL COSTS

Faced with the rapidly increasing tunneling cost on one hand and a mandate to improve urban transportation on the other, UMTA is aggressively funding its tunneling research and development program. The program has four major parts: Interaction with society. Materials handling. Ground control and stabilization. Site exploration. UMTA and local DOT officials have been working together on ways to encourage designers and contractors to adopt new techniques on certain sections of a mass transit contract. An UMTA funded study, involving 400 feet of a soft ground tunnel in the WMATA system is designed to check the settlement and ground movement of ungrouted, moderately grouted, and heavily grouted sections. UMTA is also observing two grouting projects: One project on WMATA involves a grouting for underpinning a freeway underpass. The other project involves underpinning with compaction grouting for brick buildings in the Bolton Hill section of Baltimore's system. In the rock tunneling area, UMTA has suggested that shotcrete and rock bolts be used wherever possible. Other areas of concern for UMTA are materials handling, including muck use; new design approaches for both flexible and stiff tunnel liners; the potential for standardizing components of tunnels; and, assessing the cost trade off between sealing trains entering a tunnel against rapid pressure changes or using modified portal designs.

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  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  USA  10036
  • Publication Date: 1977-3-3

Media Info

  • Features: Photos;
  • Pagination: p. 14-15
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00152538
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 31 1981 12:00AM