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2017 Vol.54, Issue 1

Research Paper

An Investigation on the Estimation Methods for the Equivalent Mohr-Coulomb Strength Parameters of Generalized Hoek-Brown Rock Mass

일반화된 Hoek-Brown 암반의 등가 Mohr-Coulomb 강도정수 산정법 고찰

Kwang-Ok Lim1
,
Youn-Kyou Lee2*
임 광옥1
,
이 연규2*
1군산대학교 대학원 해양산업공학과
2군산대학교 해양건설공학과
* Corresponding Author
28 February 2017. pp. 1-10
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Abstract

Many practical engineers are often accustomed to understanding the strength of the rock mass in terms of friction angle and cohesion. Therefore, it is necessary to provide a resonable tool implementing the Generalized Hoek-Brown (GHB) failure condition in the framework of the Mohr-Coulomb (M-C) criterion. In this study, the features of Lee (2015) and Hoek et al. (2002) methods for calculating the equivalent friction angle and cohesion of GHB rock masses were briefly reviewed. Subsequently, in order to compare the accuracy of the two methods, the ultimate bearing capacity of strip footing resting on the M-C rock mass was assessed by performing the 2D FE analysis incorporating the equivalent M-C strength constants from both approaches. The results show that Lee (2015)’s method, which exploits the upper bound solution of ultimate bearing capacity, is superior to that of Hoek et al. (2002)’s approach.

Keywords
Generalized Hoek-Brown criterion
Mohr-Coulomb criterion
Equivalent friction angle
Equivalent cohesion
Ultimate bearing capacity

현장 암반공학 기술자는 암반의 강도를 마찰각과 점착력으로 표시하는 것에 익숙한 경우가 많다. 이에 따라 일반화된 Hoek-Brown (GHB) 파괴조건식을 Mohr-Coulomb (M-C) 파괴조건식 틀 안에서 활용할 수 있는 합리적인 방법의 개발 필요성이 제기되었다. 이 연구에서는 GHB 암반의 등가마찰각과 등가점착력을 계산하는 Lee (2015)의 방법과 Hoek et al. (2002) 방법의 특징을 간략히 소개하였다. 두 방법의 정확성을 비교 검토하기 위해 Lee (2015)와 Hoek et al. (2002)의 방법으로 산정한 등가 강도정수를 이용하여 M-C 암반의 줄기초 극한 지지력을 2차원 유한요소해석을 통해 계산하였다. 해석결과 줄기초 극한지지력의 상계해를 활용하는 Lee (2015)의 방법이 Hoek et al. (2002)의 방법에 비해 상대적으로 우수한 것으로 나타났다.

키워드
일반화된 혹-브라운식
모어-쿨롬식
등가마찰각
등가점착력
극한지지력
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 54
  • No :1
  • Pages :1-10
  • Received Date : 2016-11-28
  • Revised Date : 2016-12-21
  • Accepted Date : 2017-02-16
  • DOI :https://doi.org/10.12972/ksmer.2017.54.1.001
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