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Guidelines and Methods on Segmental Tunnel Lining Analysis andDesign – Review and Best Practice Recommendation
Abstract: Methods for analysis and design of segmental tunnel linings are presented inconformance with standards and guidelines from Austria (ÖVBB), France (AFTES), Germany(DAUB), Japan (JSCE), Netherland, United States (FHWA) and International Tunneling Association(ITA). Effect of embedment loads on segments is analyzed using elastic equations, a beam-springmodel, and Finite Element or Finite Difference...
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Lessons Learned from the First NATM Tunnel in California, Devil’s Slide Tunnel
Abstract: The Devil’s Slide tunnel is located along the California coast between Pacifica and Montara, west of the San Francisco Bay in the USA in a region with steep and unstable geological formation. The twin tubes were constructed beneath San Pedro Mountain using the New Austrian Tunneling Method (NATM). Each tube is 9m wide x 6.8m high and 1300m long making it the longest highway tunnel in...
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When does brittle failure become violent? Spalling and rockburst characterization for deep tunneling projects
Abstract: Brittle behavior in the form of spalling, wall buckling and sudden shear release can occur with audibly dramatic results but often no immediate impact on safety or tunnel operations. In heterogeneous geomechanical domains, however, the potential for damaging energy release is possible. Brittle spalling can be easily predicted with conventional and advanced rock mechanics tools. The prediction...
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An analysis of FIDIC red book contractual framework applied to underground works
Abstract: FIDIC red book contractual framework is widely used in civil works contracts worldwide. Nonetheless some clauses deserve to be revised to allow their correct application to underground works. In particular the geologic risk sharing principles are not integrated in FIDIC standard contract. On the other hand, about risks other than geology related ones, the FIDIC framework affects some of them...
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