• Title/Summary/Keyword: ISRM

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Fifty Years of the ISRM and Associated Progress in Rock Mechanics (국제암반역학회의 50년의 발자취)

  • Park, Jung-Wook;Park, Chul-Whan;Han, Kong-Chang
    • Tunnel and Underground Space
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    • v.21 no.6
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    • pp.407-426
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    • 2011
  • This technical report is to introduce the paper which was presented in the 2011 ISRM Congress at Beijing by Prof. Edwin T. Brown. In commemoration of the fiftieth year of the life of ISRM, the emergence of rock mechanics as a distinctive engineering and scientific discipline is described. And the state and achievements of the discipline at the time the ISRM was founded in 1962, the events leading up to the formation of the Society, the development and achievements of the Society in the 50 years since 1962, and the progress made in the discipline of rock mechanics and rock engineering since that time are also discussed.

암반불연속면의 지질공학적 특성 및 조사상의 문제(불연속면 특성의 정량화를 중심으로)

  • 김교원
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.10a
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    • pp.185-198
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    • 2001
  • 암반 불연속면에 대한 조사는 국제 암반역학회(ISRM)에서 추천하는 조사법이 합리적으로 불연속면이 특성을 기재할 수 있는 방안이기 때문에 널리 적용되고 있다 그러나, 이 안에서는 조사결과를 공학적 의미가 있는 암반특성치로 변환하는 방안에 대한 언급이 없다. 본고에서는 지질기술자들이 불연속면조사시 주로 사용하는 ISRM 추천안인 제시한 조사항목에 토목기술자들이 주로 사용하는 RMR 혹은 Q-system 분류안의 정량적인 값을 적용할 수 있을 지를 검토하였다. 이에 대한 관련기술자들의 관심이 모여질 때 정량적인 인자에 기초한 ISRM 조사법에 부합되는 암반분류안의 구축도 가능하리라 생각된다.

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A Study on Shearing Characteristics of Joint Model (인공 절리모델에 대한 전단특성 연구)

  • 장보안;조종수
    • The Journal of Engineering Geology
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    • v.9 no.1
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    • pp.69-82
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    • 1999
  • Direct shear tests are perfromed for artifical joint models made of cement with 25 types of different strength and roughness. The tests consist of the multi-stage test which is a common test method for a single joint plane and the test method suggested by ISRM. Then, not only the differences of friction angles between the two test methods are compared, but is the effectiveness of the multi-stage test investigated. The average of friction angles measured from the multi-stage test is $6.4^{\circ}$ lower than that from the ISRM test. Although the strength and roughness of samples vary, the differences of friction angles between the two test methods are constant. The relationship between the shear stress and the normal stress measured from the multi-stage test is well correlate with the Patton's equation. Whereas, the Barton's equation is best fitted with those measured from ISRM test.

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A Review of Strength Estimation Method on Ulsan Sedimentary Rocks (울산지역 퇴적암의 강도 추정법 연구 - 점 하중 강도지수로 일축 압축강도 추정 -)

  • Min, Tuk-Ki;Moon, Jong-Kyu
    • Journal of the Korean Geotechnical Society
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    • v.22 no.8
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    • pp.63-72
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    • 2006
  • In the ASTM and ISRM, an uniaxial compressive strength(${\sigma}_{c}$) has been estimated to be 23(ASTM) or $20{\sim}25$(ISRM) times of point load strength index using a diametral test regardless of the rock rating or geological conditions. This paper presents a relationship between $I_{s}$ and ${\sigma}_{c}$ of a weak sedimentary rocks on Ulsan of the Kyung-Sang Basin in Korea. In the results of 291 for ${\sigma}_{c}$ test and 2310 for $I_{s}$ test from 77 spots, the predicted errors of ${\sigma}_{c}$ determined by strength ratio of ${\sigma}_{c}/I_{s}$ have been relatively less than those determined by linear regression analysis. And in case of weak sedimentary rocks such as mudstones, shales and sandstones, ${\sigma}_{c}$ should be lower than those suggested by ISRM and ASTM.

Suggestions for a New Method of Schmidt Hammer Blowing and Data Analysis on Rocks (I) (암석을 대상으로 시행하는 Schmidt Hammer 타격법의 새로운 제안 (I))

  • Min, Tuk-Ki;Moon, Jong-Kyu;Lee, Sang-Il
    • Tunnel and Underground Space
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    • v.19 no.4
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    • pp.328-338
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    • 2009
  • Schmidt hammer test as an indirect method has so far been widely applied for determining the physical properties of intact rock, and many researchers have developed procedures for its use on rock cores, blocks and in field. Though many methods have developed upto date for indirect using, the almost were single blow which has many errors. The purpose of this study was to evaluate the established as for ASTM, ISRM, BSI, Poole & Farmer and Hucka method and to suggest a new optimum test method and statistical analysis on rocks. The finding has indicated that succeeding blow has served as an optimal to predict physical properties of rocks. To conduct the experiment, researchers have examined 150 rock blocks, which include igneous, metamorphic and sedimentary rocks in Korea nation wide.

The Size Effect in Measuring the Fracture Toughness of Rock using Chevron Bend Specimen (암석의 파괴인성 측정에서 나타나는 CB 시험편의 치수효과에 관하여)

  • 김재동;백승규
    • Tunnel and Underground Space
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    • v.2 no.2
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    • pp.251-264
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    • 1992
  • In this study, the size effect in measuring the fracture toughness of rock was investigated using the ISRM Suggested Method for Fracture toughness using Chevron Bend Specimens. Total 58 specimens were prepared with 4 different diameters, 29, 42, 54, 68mm and center cut-chevron notch. In addition to this, to evaluated the effect of anisotropy of Jecheon granite, which is the sample for this study, core drilling direction was adjusted perpendicular(short transverse) and parallel(arrester) to the rift plane in the sample and the measured fracture toughness for each direction were compared. Important results obtained from this study are as follows. Level ll test condition is more adequate than l, because of low data scattering and precision and corrected fracture toughness of Jechoen granite measured and 2.2MPa{{{{ SQRT { m} }}}} for arrester direction with minimum initial crack length 0.7cm. From the relationship between core diameter and initial crack length presented in the ISRM testing method, the specimen diameter should be bigger than 47mm. The fracture toughnesses measured for arrester and short transverse directon show 10% difference. This is to the anisotropy of Jecheon granite possessing rift plane.

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Engineering Geological Characteristics of Sedimentary Rocks at Ulsan Area (울산지역 퇴적암류의 지질공학적 특성)

  • Kim, Kwang-Sik;Kim, Kwang-Yeom;Seo, Yong-Seok;Kim, Chang-Yong
    • The Journal of Engineering Geology
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    • v.17 no.4
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    • pp.535-544
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    • 2007
  • Discontinuities developed in a sedimentary rock mass are the most important factor to determine mechanical properties of the rock mass. Parameters described discontinuities in rock mass generally connote heterogeneity and uncertainty. In this study, probabilistic statistics method was used to determine parameters of discontinuities quantitatively and objectively. The field survey was conducted at 33 sedimentary rock slopes in Ulsan area, according to the suggested methods for the quantitative description of discontinuities in rock mass(ISRM, 1978). The engineering geological characteristics of the sedimentary rocks at Ulsan area was determined as probability distribution function deduced by analyzing parameters of discontinuities.