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SETSCI - Volume 3 (2018)
ISAS2018-Winter - 2nd International Symposium on Innovative Approaches in Scientific Studies, Samsun, Turkey, Nov 30, 2018

Correlation between point load index and uniaxial compression strength for claystone from Caycuma formation Kocaeli, Turkey (ISAS2018-Winter_91)
Zülal Akbay Arama1*, Melek Yaramış2
1İstanbul University, İstanbul, Turkey
2İstanbul University, İstanbul, Turkey
* Corresponding author: zakbay@istanbul.edu.tr
Published Date: 2019-01-14   |   Page (s): 476-481   |    9     3

ABSTRACT Evaluation of rock engineering properties is a significant phenomenon for mining, civil and geotechnical engineering
disciplines. Uniaxial compressive strength is one of the most important engineering parameters and it is used to characterize
rocks from the strength point of view. The procedure to determine the uniaxial compression strength is standardized by
International Society of Rock Mechanics Commission on Testing Methods (ISRM) and American Society for Testing and
Materials (ASTM). The indirect method proposed by the societies are generally preferred to evaluate the uniaxial compressive
strength utilizing the point load test because of simplicity and inexpensiveness of application. Numerous correlations are offered
in the literature those are integrating uniaxial compression strength to the point load strength index. These equations’ variability
range is very large depending on the rock type and geological conditions. Because of these fundamental changes of equations it
becomes important to select the proper index for the determination of rock strength. This paper involves point load tests of clay
stones which are a member of Caycuma formation of Kocaeli province for evaluating the uniaxial compression strength. 208
point load tests and 30 uniaxial compression tests are used to identify Caycuma formations’ characteristics throughout fifty
meters depth. As a consequence, an appropriate particular index value for calculating Caycuma clay stones’ uniaxial compression
strength is achieved with the correlations subjected to the point load tests.  
KEYWORDS Rock, point load test, uniaxial compression strength, correlation.
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