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ISSN : 2233-8292

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논문 투고

Vol.15 No.4
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저변성퇴적암 사면에서 지질특성이 차별풍화에 미치는 영향

Effect of geological characteristics on differential weathering of low-graded metasedimentary rock slopes

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2013, v.15 no.4, pp.375-385
정해근 (한국수자원공사)
서용석 (충북대학교)
임명혁 (대전대학교)
정해근, 서용석, & 임명혁. (2013). 저변성퇴적암 사면에서 지질특성이 차별풍화에 미치는 영향. (사)한국터널지하공간학회, 15(4), 375-385.
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초록

본 논문에서는 천매암을 중심으로 저변성퇴적암류에 속하는 암석을 대상으로 암석학적 특징과 풍화도의 상관성에 대하여 분석하였다. 현장 지질조사를 통하여 암석의 풍화도를 결정하였고, 구성암석의 강도 값을 추정하기 위하여 슈미트해머 테스트를 실시하였다. 9개 시료의 현미경 박편 관찰을 통하여 주구성광물의 부피비와 엽리의 간격을 측정하였다. 암석시료의 현미경 분석 결과에 의하면 풍화도가 낮을수록 풍화에 강한 석영성분이 많고, 풍화도가 높을수록 풍화에 약한 운모성분이 많은 것으로 나타났다. 또한 엽리 간격이 좁을수록 강도는 낮고 풍화도는 높은 것으로 나타났다.

keywords
Low-graded metasedimentary rocks, Weathering grade, Mineral composition, Spacing of foliation, Schmidt hammer test, 저변성퇴적암, 풍화도, 광물조성, 엽리간격, 슈미트해머 테스트

Abstract

This study evaluates correlation between petrographic characteristics and weathering grade of low-graded metasedimentary rocks mainly consisting of phyllite. Weathering grade of rock material was determined based on the results of geological survey. The Schmidt hammer test was carried out to obtain estimates of strength of rock materials. Point counting and microscopic observation were also conducted to analyze mineral composition and to measure spacing of foliation for 9 rock specimens. As a result of microscopic analysis, as the weathering grade was lower, the quartz was found more in quantity, consequently making rock stronger against weathering process. On the other side, lower weathering grade of rock resulted in less content of mica which is weak against weathering process. In addition, the rock materials with closer foliation spacing are found to be weaker in strength and have higher weathering grade.

keywords
Low-graded metasedimentary rocks, Weathering grade, Mineral composition, Spacing of foliation, Schmidt hammer test, 저변성퇴적암, 풍화도, 광물조성, 엽리간격, 슈미트해머 테스트

참고문헌

1.

1. Cho, Y.H., Lim, D.S., Chun, B.S. (2010), “A case study on the slope collapse and reinforcement method of the phyllite slope”, Journal of Korea Geo-Environmental Society, Vol. 11, No. 8, pp. 83-93.

2.

2. Gupta, A.S., Rao K.S. (2001), “Weathering indices and their applicability for crystalline rocks”, Bulletin of Engineering Geology and the Environment, Vol. 6, No. 3, pp. 201-221.

3.

3. ISRM (1978), “Suggested methods for the quant itative description of discontinuities in rock masses”, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 15, pp. 319-368.

4.

4. Kim, H.S., Cho, D.S. (1993), “Genesis of talc deposits in the Chungju area, Korea”, Journal of Petrological Society of Korea, Vol. 2, No. 2, pp. 95-103.

5.

5. Koçkar, M.K., Akgün, H. (2003), “Methodology for tunnel and portal support design in mixed limestone, schist and phyllite conditions: a case study in Turkey”, International Journal of Rock Mechanics & Mining Sciences, Vol. 40, pp. 173-196.

6.

6. Koo, H.B., Kim, S.H., Kim, S.H., Lee, J.Y. (2008), “A study on jointed rock mass properties and analysis model of numerical simulation on collapsed slope”, Journal of Korean Geotechnical Society, Vol. 24, No. 5, pp. 65-78.

7.

7. Kwon, Y.I., Jin, M.S. (1974), “Explanatory text of the geological map of Cheong Ju sheet (1: 50,000)”, Korea Institute of Geoscience and Mineral Resources.

8.

8. Lee, B.J., Kim, D.H., Choi, H.I., Kee, W.S., Park, K.H. (1996), “Explanatory text of the geological map of Daejeon sheet(1:250,000)”, Korea Institute of Geoscience and Mineral Resources.

9.

9. Lee, S.H., Kim, M.K. (1997), “Lithogeochemical characteristics of the granitic rocks in Chungju- Chongju area”, Journal of Industrial Science, Chongju University, Vol. 15, pp. 109-116.

10.

10. Lee, S.K., Son, W.H., Jeong, S.H. (2007), “A study on over-break characteristics of tunnel in phillite rock masses”, Journal of Geological Society of Korea, Vol. 2007, No. 2007, pp. 169.

11.

11. Park, B.S., Cho, H., Youn, S.P., Lee, S.H. (2011), “Case study on stability analysis of phyllite rock slopes in national road construction”, International Journal of Geo-Engineering, Vol. 3, No. 3, pp. 41-52.

12.

12. Park, H.I., Lee, J.D., Jeong, J.G. (1977), “Geological map of Korea : Yuseong sheet(1:50,000)”, Korea Institute of Geoscience and Mineral Resources.

13.

13. Powell, C.McA. (1979), “A morphological classification of rock cleavage”, Tectonophysics, Vol. 58, No. 1-2, pp. 21-34.

14.

14. Santi, P.M. (2006), “Field methods for characterizing weak rock for engineering”, Journal of Environmental and Engineering Geoscience, Vol. 6, No. 1, pp. 1-11.

15.

15. Shin, K.J., Kim, S,K., Kim, J.H. (2003), “A case study of failure behavior in phyllite slope of developed rock cleavages”, Korean Society for Rock Mechanics Conference, pp. 121-134.

16.

16. Tanyas, H., Ulusay, R. (2013), “Assessment of structurally-controlled slope failure mechanisms and remedial design considerations at a feldspar open pit mine, western turkey”, Engineering Geology, Vol. 155, pp. 54-68.

17.

17. Tinoco, F.H., Salcedo, D.A. (1981), “Analysis of slope failures in weathered phyllite”, ISRM International Symposium, Japan, pp. 8.

18.

18. Um, J.K. (2008), “A reinforcement case of slope failure by fractured zone of schist and gneiss”, Journal of Korean Geotechnical Society, Vol. 24, No. 8, pp. 34-41.

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