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2026 Vol.42, Issue 4 Preview Page
Measurement of Nonuniform Volumetric Deformation of Triaxially Compressed Sands Using Structured Light 3D Scanning

구조광학 3D 스캐닝 기법을 활용한 삼축압축시험 중 사질토의 비균질 체적 변형 측정

Hyunsoo Roh1
,
Young-Hoon Jung2*
노 현수1
,
정 영훈2*
1Member, Graduate Student, Dept. of Civil Engineering, Kyung Hee Univ.
2Member, Prof., Dept. of Civil Engineering, Kyung Hee Univ.
1정회원, 경희대학교 사회기반시스템공학과 석사과정
2정회원, 경희대학교 사회기반시스템공학과 교수
*Corresponding Author
31 August 2026. pp. 35-49
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Abstract

This study introduces a system integrating structured-light three-dimensional (3D) scanning with segmental volume measurements to analyze the nonuniform volumetric deformation and strain localization of sand specimens during triaxial compression. Point cloud data are used to model the 3D specimen geometry, thereby addressing the limitations of conventional volumetric methods while complementing high-cost X-ray computed tomography and two-dimensional (2D) measurement techniques. Segmental volume measurements captured local volume changes in the central zone that were masked by globally averaged measurements, and failure modes associated with different specimen densities were visualized using 3D displacement fields and 2D unwrapped images. In dense specimens, a change in the slope of the local volumetric strain curve preceded surface shear-band formation, demonstrating a clear link between shear band development and volumetric response. The framework provides a reliable experimental basis for interpreting nonuniform sand behavior and supporting numerical analyses.

Keywords
Nonuniform volumetric deformation
Point cloud data
Segmental volume measurement technique
Strain localization
Structured light 3D scanning
Triaxial compression test

본 연구에서는 삼축압축시험 중 사질토의 비균질 체적 변형과 변형률 국부화를 분석하기 위해 구조광학 3D 스캐닝 시스템과 분할 체적 측정 기법을 도입하였다. 포인트 클라우드 데이터(PCD)로 시편의 3차원 형상을 모델링함으로써 기존 체적 측정 방식의 한계를 극복하고, 고비용 X-선 CT와 2차원 계측 기법을 보완하였다. 분할 계측을 통해 평균값에 가려져 있던 중앙부의 국부 체적 변화를 포착하였고, 3차원 변위장과 2D 전개 영상으로 시료 상태별 파괴 모드를 시각화하였다. 특히 조밀한 시편에서 국부 체적 곡선의 기울기 변화가 표면 전단대 식별보다 선행하여 나타나, 전단대 형성과 체적 변화 사이의 인과관계를 확인하였다. 제안된 프레임워크는 사질토의 비균질 거동 해석 및 수치해석을 위한 신뢰성 있는 실험적 기초 자료로 활용될 수 있다.

References
1

Bolton, M. D. (1986), “The Strength and Dilatancy of Sands”, Géotechnique, Vol.36, No.1, pp.65-78. https://doi.org/10.1680/geot.1986.36.1.65.

10.1680/geot.1986.36.1.65
2

Chen, Z., Zhang, C., Tang, Z., Fang, K., and Xu, W. (2024), “Three-Dimensional Reconstruction and Deformation Identification of Slope Models Based on Structured Light Method”, Sensors, Vol.24, No.3, pp.794, https://doi.org/10.3390/s24030794.

10.3390/s2403079438339510PMC10857597
3

Cho, G.C., Dodds, J., and Santamarina, J.C. (2006), “Particle Shape Effects on Packing Density, Stiffness, and Strength: Natural and Crushed Sands”, Journal of Geotechnical and Geoenvironmental Engineering, Vol.132, No.5, pp.591-602, https://doi.org/10.1061/(ASCE)1090-0241(2006)132:5(591).

10.1061/(ASCE)1090-0241(2006)132:5(591)
4

Desrues, J. and Viggiani, G. (2004), “Strain Localization in Sand: An Overview of the Experimental Results Obtained in Grenoble Using Stereophotogrammetry”, International Journal for Numerical and Analytical Methods in Geomechanics, Vol.28, No.4, pp.279-321, https://doi.org/10.1002/nag.338.

10.1002/nag.338
5

Desrues, J., Andò, E., Mevoli, F. A., Debove, L., and Viggiani, G. (2018), “How does Strain Localise in Standard Triaxial Tests on Sand: Revisiting the Mechanism 20 Years on”, Mechanics Research Communications, Vol.92, pp.142-146, https://doi.org/10.1016/j.mechrescom.2018.08.007.

10.1016/j.mechrescom.2018.08.007
6

Fayek, S., Xia, X., and Zhang, X. (2023), “Point Density for Soil Specimen Volume Measurements in Image-based Methods during Triaxial Testing”, Geotechnical Testing Journal, Vol.46, No.6, pp.1253-1270, https://doi.org/10.1007/s11440-023-02052-7.

10.1007/s11440-023-02052-7
7

Han, Y. C., Lim, H. S., and Jeong, S. S. (2014), “The Strength and Deformation Characteristics of Jumunjin Sand under Low Confining Stresses”, Journal of the Korean Geotechnical Society, Vol.30, No.2, pp.33-42, https://doi.org/10.7843/kgs.2014.30.2.33.

10.7843/kgs.2014.30.2.33
8

Higo, Y., Oka, F., Kimoto, S., Sanagawa, T., and Matsushima, Y. (2011), “Study of Strain Localization and Microstructural Changes in Partially Saturated Sand during Triaxial Tests Using Microfocus X-ray CT”, Soils and Foundations, Vol.51, No.1, pp.95-111, https://doi.org/10.3208/sandf.51.95.

10.3208/sandf.51.95
9

Imseeh, W. H., Alshibli, K. A., and Al-Raoush, R. I. (2020), “Discrepancy in the Critical State Void Ratio of Poorly Graded Sand due to Shear Strain Localization”, Journal of Geotechnical and Geoenvironmental Engineering, Vol.146, No.8, 04020066, https://ascelibrary.org/doi/10.1061/%28ASCE%29GT.1943-5606.0002280.

10.1061/(ASCE)GT.1943-5606.0002280
10

Kim, Y. S., Kim, J. H., Ko, H. W., and Lee, J. G. (2012), “Dynamic Deformation Characteristics of Joomunjin Standard Sand Using Cyclic Triaxial Test”, Journal of the Korean Geotechnical Society, Vol.28, No.12, pp.53-64, https://doi.org/10.7843/kgs.2012.28.12.53.

10.7843/kgs.2012.28.12.53
11

Lee, S. H., Park, K. H., Han, J. T., and Kim, J. G. (2022), “Comparative Study on the Evaluation of Liquefaction Resistance Ratio According to the Application of the Korean Standard for Cyclic Triaxial Strength Test”, Journal of the Korean Geotechnical Society, Vol.38, No.9, pp.35-44, https://doi.org/10.7843/kgs.2022.38.9.35.

10.7843/kgs.2022.38.9.35
12

Lee, Y.S. (2025), Measurement of Non-uniform Volume Change of Triaxially Compressed Specimen Using Point Cloud Data, Master thesis, Kyung Hee University, Yongin, Korea.

13

Salvatore, E., Spacagna, R. L., Andò, E., and Ochmanski, M. (2019), “Strain Localization in Triaxial Tests on Sand Studied with Geostatistical Analyses of the Porosity Distribution”, Géotechnique Letters, Vol.9, No.1, pp.44-49, https://doi.org/10.1680/jgele.18.00228.

10.1680/jgele.18.00228
14

Zhang, X., Li, L., Chen, G., and Lytton, R. L. (2015), “A Photogrammetry-based Method to Measure Total and Local Volume Changes of Unsaturated Soils during Triaxial Testing”, Acta Geotechnica, Vol.10, No.1, pp.55-82, https://doi.org/10.1007/s11440-014-0346-8.

10.1007/s11440-014-0346-8
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 42
  • No :4
  • Pages :35-49
  • Received Date : 2026-06-02
  • Revised Date : 2026-07-12
  • Accepted Date : 2026-07-14
  • DOI :https://doi.org/10.7843/kgs.2026.42.4.35
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