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Effect of spatial characteristics of a weak zone on tunnel deformation behavior
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  • Journal title : Geomechanics and Engineering
  • Volume 11, Issue 1,  2016, pp.41-58
  • Publisher : Techno-Press
  • DOI : 10.12989/gae.2016.11.1.041
 Title & Authors
Effect of spatial characteristics of a weak zone on tunnel deformation behavior
Yoo, Chungsik;
 Abstract
This paper focuses on the deformation behavior of tunnels crossing a weak zone in conventional tunneling. A three-dimensional finite element model was adopted that allows realistic modeling of the tunnel excavation and the support installation. Using the 3D FE model, a parametric study was conducted on a number of tunneling cases with emphasis on the spatial characteristics of the weak zone such as the strike and dip angle, and on the initial stress state. The results of the analyses were thoroughly examined so that the three-dimensional tunnel displacements at the tunnel crown and the sidewalls can be related to the spatial characteristic of the weak zone as well as the initial stress state. The results indicate that the effectiveness of the absolute displacement monitoring data as early warning indicators depends strongly on the spatial characteristics of the weak zone. It is also shown that proper interpretation of the absolute monitoring data can provide not only early warning for a weak zone outside the excavation area but also information on the orientation and the extent of the weak zone. Practical implications of the findings are discussed.
 Keywords
conventional tunneling;finite element analysis;absolute displacement monitoring;weak zone;deflection line;displacement ratio;
 Language
English
 Cited by
1.
Realization and engineering application of hydraulic support optimization in residual coal remining, Journal of Intelligent & Fuzzy Systems, 2017, 32, 3, 2207  crossref(new windwow)
2.
Roof instability characteristics and pre-grouting of the roof caving zone in residual coal mining, Journal of Geophysics and Engineering, 2017, 14, 6, 1463  crossref(new windwow)
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