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A Study on the Effect of Grain Content and Size on Mechanical Properties of Artificial Sedimentary Rocks

인공 퇴적암의 모래입자 크기와 함량이 역학적 성질에 미치는 영향에 관한 연구

  • Byun, Hoon (Department of Energy Systems Engineering, Seoul National University) ;
  • Fereshtenejad, Sayedlireza (Department of Energy Systems Engineering, Seoul National University) ;
  • Song, Jae-Joon (Department of Energy Systems Engineering, Seoul National University)
  • 변훈 (서울대학교 공과대학 에너지시스템공학부) ;
  • ;
  • 송재준 (서울대학교 공과대학 에너지시스템공학부)
  • Received : 2018.02.21
  • Accepted : 2018.03.20
  • Published : 2018.04.30

Abstract

The relationship between the mechanical and textural properties of sedimentary rocks has been studied for decades. However, inconsistencies in the results have arisen from both the inhomogeneity of natural rocks and the difficulties encountered in controlling just one textural factor of interest in each experiment. This work produced artificial sedimentary rocks to enable control of every independent parameter at all times. Their homogeneity lowered the deviation of the results, and thus they produced clearer correlations than for natural rocks. The samples were made by mixing bassanite powder with water and silica sand, which produced rocks consisting of sand and gypsum cement. The effect of grain content and size on mechanical properties such as uniaxial compressive strength, Young's modulus, and seismic velocity was estimated. Increasing grain content lowered the compressive strength but raised Young's modulus and seismic velocity. Overall, grain size did not linearly affect the mechanical properties of the samples, but affected them in some way. In future, these results can be compared and integrated with similar experiments using different cement or grain types. This should allow comparison of the effects of the rock constituents themselves and their interactions, with applicability to all kinds of sedimentary rocks.

Acknowledgement

Supported by : 산업통상자원부

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