Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
권호 표지
DOI QR코드

DOI QR Code

Determination of Rock Abrasiveness using Cerchar Abrasiveness Test

세르샤 마모시험을 통한 암석의 마모도 측정에 관한 연구

  • 이수득 (서울대학교 공과대학 에너지시스템공학부) ;
  • 정호영 (서울대학교 공과대학 에너지시스템공학부) ;
  • 전석원 (서울대학교 공과대학 에너지시스템공학부)
  • Received : 2012.08.21
  • Accepted : 2012.08.24
  • Published : 2012.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Abrasiveness of rock plays an important role on the wear of rock cutting tools. In this study, Cerchar abrasiveness tests were carried out to assess the abrasiveness of 19 different Korean rocks. Cerchar abrasiveness test is widely used to assess the abrasiveness of rock because of its simplicity and inexpensive cost. This study examines the relationship between Cerchar Abrasiveness Index (CAI) and mechanical properties (uniaxial compressive strength, Brazilian tensile strength, Young's modulus, Poisson's ratio, porosity, shore hardness of rock), and the effect of quartz content, equivalent quartz content, which was obtained from XRD analysis. As a result of test, CAI was more influenced by petrographical properties than by the bonding strength of the matrix material of rock. CAI prediction model which consisted of UCS and EQC was proposed. CAI decreased linearly with the hardness of the steel pin. Numerical analysis was performed using Autodyn-3D for simulating the Cerchar abrasiveness test. In the simulations, most of pin wear occurred during the initial scratching distance, and CAI increased with the increase of normal loading.

본 연구에서는 암석 절삭 장비의 마모에 직접적인 영향을 주는 인자인 암석의 마모도(abrasiveness) 측정에 관한 연구를 수행하였다. 몇 가지 방법 중 세르샤 마모 시험(Cerchar abrasiveness test)을 통하여 암석의 마모도에 영향을 미치는 인자를 확인하고 효율적인 시험을 수행하기 위한 조건들을 연구하였다. 국내 19종 암석에 대한 시험 결과를 통하여, 세르샤 마모 지수(CAI, Cerchar Abrasiveness Index)에 영향을 미치는 암석의 역학적 물성(단축압축강도, 간접인장강도, 탄성계수, 포아송비, 공극률, 쇼어경도)과의 상관관계를 찾아보았고 X선 회절 분석을 통하여 암석의 구성 광물 중 마모도에 가장 큰 영향을 미치는 석영 함량, 등가 석영 함량과의 관계도 확인하였다. 그 결과로 암석의 입자 결합 특성보다 광물의 특성이 CAI에 영향을 더 미치는 것으로 관찰되었고, 단축압축강도와 등가 석영함량의 함수로 CAI를 예측하는 모델을 제시하였으며 핀의 경도가 커질수록 CAI값이 선형적으로 작아짐을 확인하였다. 수치해석적 연구를 통해 세르샤 마모 시험을 모사한 결과 초기 긁힘 거리에서 대부분의 마모가 발생함을 확인하였고 하중이 증가할수록 CAI값이 증가함을 확인하였다.

Keywords

References

  1. Jung, H.Y., Jeon, S., Cho, J.W., 2012, A study on punch penetration test for performance estimation of tunnel boring machine, Tunnel and underground space, Vol. 22, No. 2, pp. 144-156. https://doi.org/10.7474/TUS.2012.22.2.144
  2. Al-Ameen, S.I., & Waller, M.D., 1994, The influence of rock strength and abrasive mineral content on the Cerchar abrasive index, Engineering Geology, Vol. 36, No. 3-4, pp. 293-301. https://doi.org/10.1016/0013-7952(94)90010-8
  3. ASTM D-7625-10, 2010, Standard test method for laboratory determination of abrasiveness of rock using the Cerchar method
  4. Atkinson, T., Cassapi, V., & Singh, R., 1986, Assessment of abrasive wear resistance potential in rock excavation machinery, Geotechnical and Geological Engineering, Vol. 4, No. 2, pp. 151-163.
  5. Century Dynamics Inc., 2003, Autodyn Theory Manual, Concord, California
  6. Cho, J.W., Jeon, S., Yu, S.H., Chang, S.H., 2010, Optimum spacing of TBM disc cutters: A numerical simulation using the three-dimensional dynamic fracturing method, Tunnelling and Underground Space Technology, Vol. 25, No. 3, pp. 230-244. https://doi.org/10.1016/j.tust.2009.11.007
  7. Johnson, G.R., Cook, W.H., 1985, Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures, Engineering Fracture Mechanics, Vol. 21, No. 1, pp. 31-48. https://doi.org/10.1016/0013-7944(85)90052-9
  8. Rosiwal, A., 1896 Neue Untersuchungsergebnisse uber die Harte von Mineralien und Gesteinen. Verhandlg d kk geol R-A. Wien, pp. 475-491.
  9. Rostami, J., Ozdemir, L, Nilsen, B., 1996. Comparison between CSM and NTH hard rock TBM performance prediction models, Proceedings of Annual Technical Meeting of the Institute of Shaft Drilling and Technology, pp. 11.
  10. Thuro, K., Plinninger, R.J., 2003, Hard rock tunnel boring, cutting, drilling and blasting: rock parameters for excavatability, Proceedings of ISRM International Congress, Vol. 2, pp. 1227-1234.
  11. West, G., 1981, A review of rock abrasiveness testing for tunnelling, Proceedings of ISRM International Symposium, pp. 585-594.
  12. West, G., 1989, Rock abrasiveness testing for tunnelling, International Journal of Rock Mechanics and Mining Sciences, Vol. 26, No. 2, pp. 151-160. https://doi.org/10.1016/0148-9062(89)90003-X

Cited by

  1. Wear Resistance of Four Rocks Using Rotary Abrasion Test in Dry and Wet Conditions vol.46, pp.6, 2018, https://doi.org/10.1520/JTE20160550