Dynamic Behavior of Portal Part of Traffic Tunnel in High-Intensity Earthquake Area

A large-scale shaking table test is accomplished on the dynamic response and failure modes of a tunnel. The result is that the largest dynamic response of a tunnel structure appears at the side-wall and the shear or fracturing damage appears at the invert, which is basically the same damage state with tunnel engineering in the 5.12 Wen Chuan earthquake. The internal force value of tunnel structure minish and the numbers of cracks reduce after the shock absorption layer is set up in a model test, and optimize the stress state of tunnel. The surface cracks of the tunnel model appear firstly at both spandrels and develop diagonally at the tunnel entrance. The cracks arise in an "X"-shape distribution on the surface of the model soil. There are a lot of circumferential cracks at the tunnel portal under the condition of dynamic loads, and most of the longitudinal cracks or oblique cracks can terminate when extending to the circumferential cracks. So it is proposed that there should be more shock absorption seams designed in the vicinity of the tunnel portal in order to be propitious to damping the earthquake energy.

Language

  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: pp 3417-3422
  • Monograph Title: International Conference on Transportation Engineering 2009

Subject/Index Terms

Filing Info

  • Accession Number: 01534722
  • Record Type: Publication
  • ISBN: 9780784410394
  • Files: TRIS, ASCE
  • Created Date: Nov 12 2013 1:44PM