Estimation of elastic and plastic zones near a tunnel considering in situ rock mass conditions and the damage induced by excavation

원지반의 암반조건과 시공으로 인한 손상을 고려한 터널주변 탄·소성영역의 산정

  • 사공명 (한국철도기술연구원 궤도토목연구본부) ;
  • 백규호 (관동대학교 토목공학과)
  • Published : 2004.09.01

Abstract

Tunneling in rock mass produces two types of damages in the vicinity of a tunnel: structural and constructional damages. Structural damage represents the damage induced by the unbalance of geostatic stress caused by the tunneling, and constructional damage is the damage produced during the construction. In this study, formulations of tangential and radial stresses in the elastic and plastic zones near a tunnel, and the calculation of radius of plastic zone surrounding a tunnel are introduced by modifying the Hoek-Brown criterion of 2002 edition, which has capability of considering in situ rock mass characteristics and construction damage. From the parametric study, influences of rock mass quality, uniaxial compressive strength of intact rock, and the dimension of the tunnel on the plastic zone are investigated. The accuracy of the proposed approach is evaluated by comparing with results from the previous study.