Geomechanics and Engineering

  • 제19권5호
  • /
  • Pages.435-445
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  • 2019
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Shear infiltration and constant water content tests on unsaturated soils

  • Rasool, Ali Murtaza (National Engineering Services Pakistan (NESPAK)) ;
  • Aziz, Mubashir (Department of Civil Engineering, National University of Computer and Emerging Sciences (NUCES))
  • 투고 : 2019.09.21
  • 심사 : 2019.11.27
  • 발행 : 2019.12.10
⟨ 이전 논문 다음 논문 ⟩

초록

A series of element tests with different drainage conditions and strain rates were performed on compacted unsaturated non-plastic silt in unconfined conditions. Soil samples were compacted at water contents from dry to wet of optimum with the degree of saturation varying from 24 to 59.5% while maintaining the degree of compaction at 80%. The tests performed were shear infiltration tests in which specimens had constant net confining pressure, pore air pressure was kept drained and constant, just before the shear process pore water pressure was increased (and kept constant afterwards) to decrease matric suction and to start water infiltration. In constant water content tests, specimens had constant net confining pressure, pore air pressure was kept drained and constant whereas pore water pressure was kept undrained. As a result, the matric suction varied with increase in axial strain throughout the shearing process. In both cases, maximum shear strength was obtained for specimens prepared on dry side of optimum moisture content. Moreover, the gradient of stress path was not affected under different strain rates whereas the intercept of failure was changed due to the drainage conditions implied in this study.

키워드

과제정보

연구 과제 주관 기관 : The Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT)

The Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) is gratefully acknowledged for research facilities and financial assistance.

참고문헌

  1. ASTM D2487-11 (2011), Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System), ASTM International, West Conshohocken, Pennsylvania, U.S.A.
  2. Barr, A.D., Clarke, S.D., Tyas, A. and Warren, J.A. (2018), "Effect of moisture content on high strain rate compressibility and particle breakage in loose sand", Exper. Mech., 58(8), 1331-1334. https://doi.org/10.1007/s11340-018-0405-4.
  3. Bishop, A.W. and Henkel, D.J. (1962), The Measurement of Soil Properties in the Triaxial Test, Edward Arnold Publishers Limited.
  4. Bolzon, G. and Schrefler, B.A. (1995), "State surfaces of partially saturated soils: an effective pressure approach", Appl. Mech. Rev., 48(10), 643-649. https://doi.org/10.1115/1.3005044.
  5. Chae, J., Kim, B., Park, S.W. and Kato, S. (2010), "Effect of suction on unconfined compressive strength in partly saturated soils", KSCE J. Civ. Eng., 14(3), 281-290. https://doi.org/10.1007/s12205-010-0281-7.
  6. Estabragh, A.R. and Javadi, A.A. (2012), "Effect of suction on volume change and shear behaviour of an overconsolidated unsaturated silty soil", Geomech. Eng., 4(1), 55-65. https://doi.org/10.12989/gae.2012.4.1.055.
  7. Farooq, K., Rolando, O. and Towhata. I (2004), "Response of unsaturated sandy soils under constant shear stress drained condition", Soils Found., 44(2), 1-13. http://dx.doi.org/10.3208/sandf.44.2_1.
  8. Fredlund, D.G. and Rahardjo, H. (1993), Soil Mechanics for Unsaturated Soils, John Wiley & Sons, Inc. http://dx.doi.org/10.1002/9780470172759.
  9. Gasmo, J., Hritzuk, K., Rahardjo, H. and Leong, E. (1999), "Instrumentation of an unsaturated residual soil slope", Geotech. Test. J., 22(2), 134-143. https://doi.org/10.1520/GTJ11272J.
  10. Gibson, R.E. and Henkel, D.J. (1954), "Influence of duration of tests at constant rate of strain on measured 'drained' strength", Geotechnique, 4, 6-15. https://doi.org/10.1680/geot.1954.4.1.6.
  11. Goual, I., Goual, M.S., Taibi, S. and Abou-Bekr, N. (2011), "Behaviour of unsaturated tuff- calcareous sand mixture on drying-wetting and triaxial paths", Geomech. Eng., 3(4), 267-284. https://doi.org/10.12989/gae.2011.3.4.267.
  12. Habasimbi, P. and Nishimura, T. (2018), "Comparison of soil-water characteristic curves in one-dimensional and isotropic stress conditions", Soil Syst., 2(43), 1-15. https://doi.org/10.3390/soilsystems2030043.
  13. Habasimbi, P. and Nishimura, T. (2019), "Soil water characteristic curve of an unsaturated soil under low matric suction ranges and different stress conditions", Int. J. Geosci., 10(1), 39-56. https://doi.org/10.4236/ijg.2019.101004.
  14. Kim, Y. and Jeong, S. (2017), "Modeling of shallow landslides in an unsaturated soil slope using a coupled model", Geomech. Eng., 13(2), 353-370. https://doi.org/10.12989/gae.2017.13.2.353.
  15. Kim, B.S., Park, S.W., Takeshita, Y. and Kato, S. (2016), "Effect of suction stress on critical state of compacted silty soils under low confining pressure", Int. J. Geomech., 16(6), 1-11. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000665.
  16. Li, L. and Zhang, X. (2015), "A new triaxial testing system for unsaturated soil characterization", Geotech. Test. J., 38(6), 823-839. https://doi.org/10.1520/GTJ20140201.
  17. Lin, H.D., Wang, C.C. and Wang, X.H. (2018), "A simplified method to estimate the total cohesion of unsaturated soil using an UC test", Geomech. Eng., 16(6), 599-608. https://doi.org/10.12989/gae.2018.16.6.599.
  18. Lu, N., Godt, J.W. and Wu, D.T. (2010), "A closed-form equation for effective stress in unsaturated soil", Water Resour. Res., 46(5), W05515. https://doi.org/10.1029/2009WR008646.
  19. Luo, H., Cooper, W.L. and Lu, H. (2014), "Effect of particle size and moisture on the compressive behavior of dense eglin sand under confinement at high strain rates", Int. J. Impact Eng., 65, 40-55. https://doi.org/10.1016/j.ijimpeng.2013.11.001.
  20. Martin, B.E., Kabir, M.E. and Chen, W. (2013), "Undrained highpressure and high strain-rate response of dry sand under triaxial loading", Int. J. Impact Eng., 54, 51-63. https://doi.org/10.1016/j.ijimpeng.2012.10.008.
  21. Melinda, F., Rahardjo, H., Han, K.K. and Leong, E.C. (2004), "Shear strength of compacted soil under infiltration condition", J. Geotech. Geoenviron. Eng., 130(8), 807-817. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:8(807).
  22. Mohamed, F.M.O, Vanapalli, S.K. and Saatcioglu, M. (2013), "Generalized Schmertmann equation for settlement estimation of shallow footings in saturated and unsaturated sands", Geomech. Eng., 5(4), 343-362. https://doi.org/10.12989/gae.2013.5.4.343.
  23. Mun, W., Teixeira, T., Balci, M.C., Svoboda, J. and McCartney, J.S. (2016), "Rate effects on the undrained shear strength of compacted clay", Soils Found., 56(4), 719-731. https://doi.org/10.1016/j.sandf.2016.07.012.
  24. Nam, S., Gutierrez, M., Diplas, P. and Petrie, J. (2011), "Determination of the shear strength of unsaturated soils using the multistage direct shear test", Eng. Geol., 122(3/4), 272-280. https://doi.org/10.1016/j.enggeo.2011.06.003.
  25. Nishimura, T. (2014), "Influence of seepage event on cyclic triaxial behavior of a compacted unsaturated soil", Proceedings of the 6th International Conference on Unsaturated Soils, Sydney, Australia, July.
  26. Nishimura, T., Hirabayashi, Y., Fredlund, D.G. and Gan, J.K. (1999), "Influence of stress history on the strength parameters of an unsaturated statically compacted soil", Can. Geotech. J., 36(2), 251-261. https://doi.org/10.1139/cgj-36-2-251.
  27. Olson, R.E. and Langfelder, L.J. (1965), "Pore water pressures in unsaturated soils", J. Soil Mech. Found. Div., 91(4), 127-160. https://doi.org/10.1061/JSFEAQ.0000753
  28. Olson, R.E. and Parola, J.F. (1967), "Dynamic shearing properties of compacted clay", Proceedings of the International Symposium on Wave Propagation and Dynamic Properties of Earth Materials, Albuquerque, New Mexico, U.S.A., August.
  29. Peters, S., Siemens, G. and Take, W. (2011), "Characterization of transparent soil for unsaturated applications", Geotech. Test. J., 34(5), 445-456. https://doi.org/10.1520/GTJ103580.
  30. Rahardjo, H., Lim, T.T., Chang, M.F. and Fredlund, D.G. (1995), "Shear strength characteristics of a residual soil", Can. Geotech. J., 32(1), 60-77. https://doi.org/10.1139/t95-005.
  31. Rasool, A.M. and Kuwano, J. (2018), "Influence of matric suction on instability of unsaturated silty soil in unconfined conditions", Int. J. GEOMATE, 14(42), 1-7. https://doi.org/10.21660/2018.42.7115.
  32. Richardson, A.M. and Whitman, R.V. (1963), "Effect of strain-rate upon undrained shear resistance of a saturated remolded fat clay", Geotechnique, 13(4), 310-324. https://doi.org/10.1680/geot.1963.13.4.310.
  33. Saez, J. and Escario, V. (1986), "The shear strength of partly saturated soils," Geotechnique, 36(3), 453-456. https://doi.org/10.1680/geot.1986.36.3.453.
  34. Satija, S. and Gulhati, S.K. (1979), "Strain rate for shearing testing of unsaturated soil", Proceedings of the 6th Asian Regional Conference on Soil Mechanics and Foundation Engineering, Singapore, July.
  35. Svoboda, J.S. and McCartney, J.S. (2014), "Impact of strain rate on the shear strength and pore water pressure generation of saturated and unsaturated compacted clay", Proceedings of the Geo-Congress 2014, Atlanta, Georgia, U.S.A., February.
  36. Svoboda, J.S. and McCartney, J.S. (2014), Shearing Rate Effects on Dense Sand and Compacted Clay, in Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series, Springer, Cham, Switzerland, 389-395.
  37. Vilar, O.M. (2006), "A Simplified procedure to estimate the shear strength envelope of unsaturated soils", Can. Geotech. J., 43(10), 1088-1095. https://doi.org/10.1139/t06-055.
  38. Zhu, J.G. and Yin, J.H. (2000), "Strain-rate-dependent stress-strain behavior of over-consolidated Hong Kong marine clay", Can. Geotech. J., 37(6), 1272-1282. https://doi.org/10.1139/cgj-37-6-1272.

피인용 문헌

  1. Effect of grain size on the shear strength of unsaturated silty soils vol.23, pp.4, 2019, https://doi.org/10.12989/gae.2020.23.4.301