Estimation of Rock Strengths Using Block Punch Strength Index Test

doi:10.12972/ksmer.2013.50.1.088

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2013 Vol.50, Issue 1 Preview Page Next Page

Research Paper

Estimation of Rock Strengths Using Block Punch Strength Index Test Block Punch Strength Index 시험을 이용한 암석의 강도 추정에 관한 연구: 이덕환·최성웅
Deok-Hwan Lee and Sung-Oong Choi

28 February 2013. pp. 88-97

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Abstract

Uniaxial compressive strength (UCS) is one of the most important and widely used rock mechanical properties in rock engineering. Good quality specimen which is recommended in standard UCS test, however, can not be easily obtained from densely fractured or thinly bedded rock masses. In this study, the UCS and the Brazilian tensile test (BTS) have been estimated by their relations to the block punch strength index (BPI), in which a relatively thin specimen is used. Also, the validity of strength prediction based on BPI test was secured through comparison with the results of point load strength index test and schmidt hammer test.

Keywords

BPI

Uniaxial compressive strength

Brazilian tensile strength

Point load strength index

일축압축강도는 암반공학에서 가장 중요하고 널리 사용되는 암석의 역학적 특성중 하나이다. 표준 시험법에서 제안한 규격에 적합한 암석 시험편을 필요로 한다. 그러나 균열이 많거나 절리 간격이 매우 조밀하게 형성된 암반에서는 시험에 필요한 암석 코어를 쉽게 획득하지 못하는 경우가 있다. 따라서 본 연구에서는 상대적으로 얇은 두께의 시험편을 이용하는 Block punch strength index(BPI) 시험을 통해 암석의 일축압축강도와 압열 인장강도를 추정할 수 있는 관계식을 도출하였다. 또한, 점하중 시험, 슈미트 해머시험의 결과와 비교하여 BPI 시험을 통한 암석의 강도추정의 타당성을 검증하였다.

키워드

BPI

일축압축강도

압열인장강도

점하중강도

References

Bieniawski, Z.T., 1975, “The point load test in geotechnical practice,” Engineering Geology, Vol. 9, pp. 1-11.
Broch, E. and Franklin, J.A., 1972, “The point load strength test,” International Journal of Rock Mechanics and Mining Sciences Geomechanics Abstracts, Vol. 9, pp. 669-676.
ISRM, 1978a, “Suggested method for determining hardness and abrasiveness of rocks,” International Journal of Rock Mechanics and Mining Sciences Geomechanics Abstracts, Vol. 15. pp. 89-97.
ISRM, 1978b, “Suggested method for determining tensile strength of rock materials,” International Journal of Rock Mechanics and Mining Sciences Geomechanics Abstracts, Vol. 15, pp. 99-103.
ISRM, 2001, “Draft ISRM suggested method for determining block punch strength index(BPI),” International Journal of Rock Mechanics and Mining Sciences, Vol. 38, 99. 1113-1119.
Kim, K. M., Kim, D. H., Kang, J. S., Kang, S. S. and Baek, H. J., 2012, “A study on the correlation between uniaxial compressive strength and point load strength index of limestone of Imgye area,” Tunnel & Underground Space, Vol. 22. 5, pp. 330-338.
KSRM, 2005, “Standard method for sampling and preparation of rock test specimen,” Tunnel & Underground space, Vol. 15. 2, pp. 81-84.
KSRM, 2005, “Standard test method for uniaxial compressive strength of rock,” Tunnel & Underground space, Vol. 15. 2, pp. 85-86.
KSRM, 2006, “Standard test method for indirect tensile strength of rock by the Brazilian test,” Tunnel & Underground space, Vol. 16. 4, pp. 279-280.
KSRM, 2007, “Standard test method for determination of the Schmidt rebound hardness of rock,” Tunnel & Underground space, Vol. 17. 6, pp. 435-437.
KSRM, 2007, “Standard test method for point load strength of rock,” Tunnel & Underground space, Vol. 17. 2, pp. 75-82.
Min, T. K., Moon, J. K. and Ro, J. S., 2009, “Behavioral characteristics of rocks on indirect tests,” Tunnel & Underground space, Vol. 19. 5, pp. 450-462.
Mishra, D.A. and Basu, A., 2012, “Use of the block punch test to predict the compressive and tensile strengths of rocks,” International Journal of Rock Mechanics and Mining Sciences, Vol. 51, pp. 119-127.
Nam, J. M., Yun, J. M., Song, Y. S. and Kim, J. H., 2008, “Analysis of engineering properties of basalt of Cheju island,” J. Korean Geosynthetics Society, Vol. 7. 1, pp. 13-21.
Sulukcu, S. and Ulusay, R., 2001, “Evaluation of the block punch index test with particular reference to the size effect, failure mechanism and its effectiveness in predicting rock strength,” International Journal of Rock Mechanics and Mining Sciences, Vol. 38, pp. 1091-1111.
Van der Schrier, J.S., 1988, “The block punch index test,” Bulletin of International Association of Engineering Geology, Vol. 38, pp. 121-126.

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 : 50
No :1
Pages :88-97
DOI :https://doi.org/10.12972/ksmer.2013.50.1.088

[1] Bieniawski, Z.T., 1975, “The point load test in geotechnical practice,” Engineering Geology, Vol. 9, pp. 1-11.

[2] Broch, E. and Franklin, J.A., 1972, “The point load strength test,” International Journal of Rock Mechanics and Mining Sciences Geomechanics Abstracts, Vol. 9, pp. 669-676.

[3] ISRM, 1978a, “Suggested method for determining hardness and abrasiveness of rocks,” International Journal of Rock Mechanics and Mining Sciences Geomechanics Abstracts, Vol. 15. pp. 89-97.

[4] ISRM, 1978b, “Suggested method for determining tensile strength of rock materials,” International Journal of Rock Mechanics and Mining Sciences Geomechanics Abstracts, Vol. 15, pp. 99-103.

[5] ISRM, 2001, “Draft ISRM suggested method for determining block punch strength index(BPI),” International Journal of Rock Mechanics and Mining Sciences, Vol. 38, 99. 1113-1119.

[6] Kim, K. M., Kim, D. H., Kang, J. S., Kang, S. S. and Baek, H. J., 2012, “A study on the correlation between uniaxial compressive strength and point load strength index of limestone of Imgye area,” Tunnel & Underground Space, Vol. 22. 5, pp. 330-338.

[7] KSRM, 2005, “Standard method for sampling and preparation of rock test specimen,” Tunnel & Underground space, Vol. 15. 2, pp. 81-84.

[8] KSRM, 2005, “Standard test method for uniaxial compressive strength of rock,” Tunnel & Underground space, Vol. 15. 2, pp. 85-86.

[9] KSRM, 2006, “Standard test method for indirect tensile strength of rock by the Brazilian test,” Tunnel & Underground space, Vol. 16. 4, pp. 279-280.

[10] KSRM, 2007, “Standard test method for determination of the Schmidt rebound hardness of rock,” Tunnel & Underground space, Vol. 17. 6, pp. 435-437.

[11] KSRM, 2007, “Standard test method for point load strength of rock,” Tunnel & Underground space, Vol. 17. 2, pp. 75-82.

[12] Min, T. K., Moon, J. K. and Ro, J. S., 2009, “Behavioral characteristics of rocks on indirect tests,” Tunnel & Underground space, Vol. 19. 5, pp. 450-462.

[13] Mishra, D.A. and Basu, A., 2012, “Use of the block punch test to predict the compressive and tensile strengths of rocks,” International Journal of Rock Mechanics and Mining Sciences, Vol. 51, pp. 119-127.

[14] Nam, J. M., Yun, J. M., Song, Y. S. and Kim, J. H., 2008, “Analysis of engineering properties of basalt of Cheju island,” J. Korean Geosynthetics Society, Vol. 7. 1, pp. 13-21.

[15] Sulukcu, S. and Ulusay, R., 2001, “Evaluation of the block punch index test with particular reference to the size effect, failure mechanism and its effectiveness in predicting rock strength,” International Journal of Rock Mechanics and Mining Sciences, Vol. 38, pp. 1091-1111.

[16] Van der Schrier, J.S., 1988, “The block punch index test,” Bulletin of International Association of Engineering Geology, Vol. 38, pp. 121-126.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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