A new rheological model and its application in mountain tunnelling

The time-dependent features of soft rock, named rheology generally, should be taken into account in the long-term design and maintenance of mountain tunnels. Based on the classic Burger-MC rheological model, a Burger-deterioration rheological model is proposed in this paper and is implemented in the numerical codes FLAC3D. A deterioration threshold and two deterioration ratios are introduced in this model to consider the time-dependent strength deterioration aspect of the rock mass. The proposed model is appliedto an engineering instance (Ureshino Tunnel Line I, Nagasaki, Japan) to account for the delayed deformations that occurred after its completion since November 1992. The delayed crown settlement and invert upheaval computed from simulations are featured by an exponential characteristic and a stair-typed characteristic, respectively, which agree well with the in-site monitoring data qualitatively. In addition, the realistic rheological parameters involved in the proposed model can be back-analyzed from the in-sitemonitoring data. (A) Reprinted with permission from Elsevier.

• Authors:
  • GUAN, Z
  • JIANG, Y
  • TANABASHI, Y
  • HUANG, H
• Publication Date: 2008-5

Language

• English

Media Info

• Pagination: 292-299
• Serial:
  • TUNNELLING & UNDERGROUND SPACE TECHNOLOGY
  • Volume: 23
  • Issue Number: 3

Subject/Index Terms

• TRT Terms: Design; Maintenance; Mathematical analysis; Mathematical models; Simulation; Strength of materials; Tunnels
• ITRD Terms: 6471: Analysis (math); 9011: Design (overall design); 3847: Maintenance; 6473: Mathematical model; 9103: Simulation; 3374: Tunnel
• Subject Areas: Bridges and other structures; Design; Maintenance and Preservation; I25: Design of Tunnels; I60: Maintenance;

Filing Info

• Accession Number: 01090860
• Record Type: Publication
• Source Agency: TRL
• Files: ITRD
• Created Date: Mar 31 2008 7:56AM