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Numerical modeling of brittle failure of the overstressed rock mass around deep tunnel

심부 터널 주변 과응력 암반의 취성파괴 수치모델링

  • Lee, Kun-Chai (Hanyang University, Department of Natural Resources and Environmental Engineering) ;
  • Moon, Hyun-Koo (Hanyang University, Department of Natural Resources and Environmental Engineering)
  • 이근채 (한양대학교 자원환경공학과) ;
  • 문현구 (한양대학교 자원환경공학과)
  • Received : 2016.09.08
  • Accepted : 2016.09.26
  • Published : 2016.09.30

Abstract

The failure of rock mass around deep tunnel, different from shallow tunnel largely affected by discontinuities, is dominated by magnitudes and directions of stresses, and the failures dominated by stresses can be divided into ductile and brittle features according to the conditions of stresses and the characteristics of rock mass. It is important to know the range and the depth of the V-shaped notch type failure resulted from the brittle failure, such as spalling, slabbing and rock burst, because they are the main factors for the design of excavation and support of deep tunnels. The main features of brittle failure are that it consists of cohesion loss and friction mobilization according to the stress condition, and is progressive. In this paper, a three-dimensional numerical model has been developed in order to simulate the brittle behavior of rock mass around deep tunnel by introducing the bi-linear failure envelope cut off, elastic-elastoplastic coupling and gradual spread of elastoplastic regions. By performing a series of numerical analyses, it is shown that the depths of failure estimated by this model coincide with an empirical relation from a case study.

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