Study on tunneling in rock masses with inclined layers using discontinuous deformation analysis (DDA)

Jian Hong Wu, Yuzo Ohnishi, Satoshi Nishiyama

Research output: Contribution to conferencePaper

Abstract

The behaviors and stress distributions of the inclined jointed rock masses with different dip angles obtained from DDA are compared to the results of laboratory tests. By calculating the block stress distributions, it is confirmed that DDA can reproduce the arching around the trap door when lowering the trap door. The shapes of arching change with the angles of inclined layers. In addition, the earth pressures acting on the trap door shows non-symmetrical distributions when the layers are not horizontal. The stress concentration occurs in one side of the rock masses close to the trap door. Furthermore, the surface settlements are also related to the inclined angle, and the loosening zone in rock masses can be different from Terzghi's theory [1]. Since, simulations have good agreements with the laboratory test, it demonstrates the applicability of DDA to explain the mechanical behaviors of tunnel, such as arching phenomenon, non-symmetrical earth pressure distributions acting on the trap door, and the surface settlement profile in the jointed rock masses.

Original languageEnglish
Pages1343-1346
Number of pages4
Publication statusPublished - 2003
Externally publishedYes
Event10th International Society for Rock Mechanics Congress, ISRM 2003 - Sandton, South Africa
Duration: Sep 8 2003Sep 12 2003

Conference

Conference10th International Society for Rock Mechanics Congress, ISRM 2003
CountrySouth Africa
CitySandton
Period9/8/039/12/03

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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    Wu, J. H., Ohnishi, Y., & Nishiyama, S. (2003). Study on tunneling in rock masses with inclined layers using discontinuous deformation analysis (DDA). 1343-1346. Paper presented at 10th International Society for Rock Mechanics Congress, ISRM 2003, Sandton, South Africa.