DOI QR코드

DOI QR Code

Stress-Strain Characteristics of Weathered Granite Soil in Plane Strain Test

평면변형시험을 이용한 화강풍화토의 응력-변형률 특성

  • Received : 2013.12.18
  • Accepted : 2014.04.03
  • Published : 2014.05.31

Abstract

Geotechnical structures have been analyzed and constructed in various geometry conditions to maintain their stability in accordance with the characteristics of construction design. Shear strengths are generally obtained from triaxial test to apply to design analysis. Geotechnical structures under strip loading, such as earth dam, embankment, and retaining wall, have the strain in a direction, and plane strain condition. Thus, an approximate shear strengths should be applied for stability analysis suitable to ground condition. When applying shear strengths obtained from triaxial tests for slope stability analysis, the evaluation of it may underestimate the factor of safety because the implementation is not suitable for geometry condition. The paper compares shear strengths obtained from triaxial test and plane strain test based on various relative densities using weathered granite soils. Additionally, yield stress is determined by maximum axial strain 15% in triaxial test because of continuous kinematic hardening, but plane strain test can determine a failure point in critical state to evaluate the shear strengths of soils at the second plastic hardening step. This study proposes to perform an appropriate test for many geotechnical problems with plane strain condition.

Acknowledgement

Supported by : 한국연구재단

References

  1. Bowles, J.E. (1978), Engineering Properties of Soils and their Measurements, 2nd edition. McGraw-Hill Book Company, pp.185-188.
  2. Budhu, M. (2011), Soil Mechanics and Foundations, 3rd edition, JOHN WILEY & SONS, INC., pp.141-143.
  3. Choo, Y.S., Jang, E.R., and Chung, C.K. (2007), "Development and Verification of Plane Strain Apparatus for Various Stress Path", Conference of Korean Society of Civil Engineering, Geotechnical Engineering Session, pp.880-883.
  4. Goto, S., Tatsuoka, F., Shibuya, S., Kim, Y.S., and Sato, T. (1991), "A Simple Gauge for Local Small Strain Measurements in the Laboratory", Soils and Foundations, Vol.31, No.1, pp.136-151.
  5. KS F 2346 (2007), "Method for unconsolidated and undrained triaxial test in clay", ICS Code: 13.080, Soil quality. Pedology, Korean Agency for Technology and Standards.
  6. Lee, K.L. and Shubeck, R.T. (1971), "Plane-Strain Undrained Strength of Compacted Clay", Journal of the Soil Mechanics and Foundations Division, ASCE, Vol.97, No.Sm1, pp.219-234.
  7. Lee, Y.S., Kim, C.Y., and Chung, C.K. (2003), "A Newly-developed Plane Strain Testing Device and its Applicability", Conference of Korean Society of Civil Engineering, Geotechnical Engineering Session, pp.3645-3650.
  8. Oda, M. (1981), "Anisotropic Strength of Cohesionless Sands", Journal of Geotechnical Engineering, Division, Proceeding of ASCE, Vol.197, GT9, pp.1219-1231.
  9. Tatsuoka, F., Sakamoto, M., Kawamura, T., and Fukushima, S. (1986), "Strength and deformation characteristic of sand in plane strain compression at extremely low pressure", Soils and Foundations, Vol.26, No.1, pp.65-84. https://doi.org/10.3208/sandf1972.26.65
  10. Yasin, S.J.M. (1998), "Strength and deformation characteristics of sands in plane strain shear tests", Ph.D. thesis, University of Tokyo, Japan.