Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Development of a Sampler that Minimizes Sample Disturbance and Review of its Applicability

인발시 시료이탈을 최소화한 불교란시료 채취 샘플러 개발 및 적용성 검토

  • Kim, Jongkwan (Korea Institute of Civil Engineering and Building Technology) ;
  • Han, Jin-Tae (Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Ka-hyun (Korea Institute of Civil Engineering and Building Technology) ;
  • Shin, Hyu-Soung (Korea Institute of Civil Engineering and Building Technology) ;
  • Zhuang, Li (Korea Institute of Civil Engineering and Building Technology) ;
  • Yeom, Sun (Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Ki-Seog (Heesong Geotek Co. Ltd.)
  • Received : 2023.02.20
  • Accepted : 2023.03.03
  • Published : 2023.03.31
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Abstract

In order to accurately determine soil characteristics, it is necessary to collect undisturbed samples, and it is important to collect these samples with minimal disturbance. In this study, a sampler that minimizes sample disturbance was developed by attaching a catcher to the tip, and its applicability was reviewed through in situ sampling, X-ray CT, and laboratory tests. Results confirmed that horizontal cracks are likely to occur when using the Shelby tube sampler, whereas these cracks can be suppressed when using the newly developed sampler. Moreover, consolidation and shear test results showed that the samples collected using the newly developed sampler showed higher maximum shear strength compared to those collected using the Shelby tube sampler.

지반의 특성을 정확하게 파악하기 위해서는 불교란시료 채취가 필수적이며, 이때 최대한 시료를 교란하지 않고 채취하는 것이 중요하다. 본 연구에서는 선단부에 시료 이탈을 방지하는 캐쳐를 장착하여 시료이탈을 최소화하는 샘플러를 개발하였고 이를 대상으로 현장시료채취, CT촬영, 실내시험을 통해 그 적용성을 검토하였다. 동일한 위치에서 쉘비튜브샘플러와 새롭게 개발한 샘플러로 채취한 시료의 CT촬영결과 쉘비튜브샘플러의 경우 수평방향 균열이 발생할 가능성이 높은데 반해 새롭게 개발한 샘플러의 경우 수평방향 균열의 발생을 억제할 수 있는 것으로 나타났다. 또한, 압밀시험과 전단시험 결과 새롭게 개발한 샘플러로 채취한 시료가 쉘비튜브샘플러로 채취한 시료에 비해서 최대전단강도가 높은 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부 한국건설기술연구원 연구운영비지원(주요사업)사업으로 수행되었습니다(과제번호 20230105-001, 인공지능을 활용한 대심도 지하 대공간의 스마트 복합 솔루션 개발 - 미래 지하 대공간 안전을 위한 스마트 복합 솔루션 개발(3/3)).

References

  1. Chen, C.C., Lee, W.F., Chen, J.W., and Ishihara, K. (2014), Liquefaction Potential of Non-plastic Silty Sand, Journal of Marine Science and Technology, Vol.22, No.2, pp.137-145.
  2. Cnudde, V. and Boone, M.N. (2013), High-resolution X-ray Computed Tomography in Geosciences: A Review of the Current Technology and Applications, Earth-Sci. Rev. 123, pp.1-17. https://doi.org/10.1016/j.earscirev.2013.04.003
  3. KICT (2008), Economically feasibility and safety of construction work from the point of geotechnical investigations, Reserach report.
  4. Kim, J.H., Kwon, Y.M., Park, K.B., Kim, Y.S., and Kim, D.S. (2017), Dynamic Soil Properties of Frozen and Unfrozen Soils from Terra Nova Bay in Eastern Antarctica, Journal of the Korean geotechnical society, Vol.33, No.3, pp.37-47.
  5. Kim, Y., Hwang, B., and Cho W. (2018), Development of Ground Freezing System for Undisturbed Sampling of Granular Soils, Advanced in civil engineering, 2018, pp.1-13.
  6. Kim, Y.C. and Kang, J.M. (2003), A Study on the Character of Obtained Sample by Large Diameter Sampler and Piston Sampler, Journal of the Korean Society of Civil Engineers, Vol.23, No.2C, pp.71-77.
  7. Kwag, J.M., Chung, S.G., Baek, S.H., Lee, Y.N., and Jo, K.Y. (2003), Sample Disturbance due to Sampling Techniques and Comparison of Consolidation Parameters Between Testing Methods on Pusan Clays, Journal of the Korean geotechnical society, Vol.19, No.4, pp.43-53.
  8. Lefebvre, G. and Poulin, C. (1979), A New Method of Sampling Sensitive Clay, Canadian Geotechnical Journal, Vol.16, No.1, pp. 226-233. https://doi.org/10.1139/t79-019
  9. Micheal, P.E., Ronald, D.A., and William, M.C. (2014) Ground Freezing and Sampling of Pleistocene Sand Near Charleston, South Carolina, Journal of Geotechnical and Geoenvironmental Engineering, Vol.140, No.1, pp.185-193. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000991
  10. Park, S.J., Oh, W.T., and Chung, K.H. (2002), Research on Soil Characteristic of Clayey Sampled by Different Sampler, Journal of the Korean geotechnical society, Vol.18, No.5, pp.12-21.
  11. Patent No.10-2322111 A UNDISTURBED SOIL COLLECTION SAMPLER.
  12. Rochelle, P.L., Sarrile, J., Tavenas, F., Roy, M., and Leroueil, S. (1981), Causes of Sampling Disturbance and Design of a New Sampler for Sensitive Soil, Canadian Geotechnical Journal, Vol.18, No.1, pp.52-66. https://doi.org/10.1139/t81-006
  13. Shuster, J.A. (1981), Engineering Quality Assurance for Construction Ground Freezing, Engineering Geology, Vol.18, No.1-4, pp.333-350. https://doi.org/10.1016/0013-7952(81)90072-7
  14. Son, H.W. (2000), Analysis and Application of Ground Investigation and Laboratory Test, Engineers, Vol.14, No.128, pp.102-110.
  15. Sun, W., Brown, S.B., and Leach, R.K. (2012), An overview of industrial X-ray computed tomography. National Physical Laboratory Report, ENG 32.
  16. Taylor, M.L., Cubrinovski, M., and Haycock, I. (2012), Application of new "Gel-push" sampling procedure to obtain high quality laboratory test data for advanced geotechnical analyses, in 2012 NZSEE Conference. Christchurch, New Zeland, pp.1-8.
  17. Umehara, Y., Chiaro, G., Kiyoya, T., Hosono, Y., Yagiura, Y., and Chiba, H. (2015), Effectiveness of 'Gel-Push' Sampling Technique to Retrieve Undisturbed Sandy Specimens for Liquefaction Test, Geology, in Proceedings of 6th international conference on earthquake geotechnical engineering, Christchurch, New Zealand, November.
  18. Yoon, Y.W., Kim, Y.J., and Choi, E.H. (2008), Evaluation of Disturbance of Clay Samples Due to Sampling Methods, Journal of the Korean Geoenvironmental Society, Vol.9, No.1, pp.27-31.
  19. Yoshimi, Y., Hatanaka, M., and Oh-oka, H. (1978), Undisturbed Sampling of Saturated Sands by Freezing, Soils and Foundations, Vol.18, No.3, pp.59-73. https://doi.org/10.3208/sandf1972.18.3_59
  20. Zhuang, L., Shin, H.S., Yeom, S., Pham, C.N., and Kim, Y.J. (2022), A novel method for estimating subresolution porosity from CT images and its application to homogeneity evaluation of porous media. Scientific reports, 12, 16229.
  21. Zhuang, L., Yeom, S., and Shin, H.S. (2020), Development of Triaxial Cells Operable with In Situ X-ray CT for Hydro-Mechanical Laboratory Testing of Rocks, Journal of the Korean geotechnical society, Vol.36, No.9, pp.45-55.