Geomechanics and Engineering

  • 제23권3호
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  • Pages.207-215
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  • 2020
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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

Passive earth pressure for retaining structure considering unsaturation and change of effective unit weight of backfill

  • Zheng, Li (Department of Civil Engineering, Tongji University) ;
  • Li, Lin (Department of Civil Engineering, Tongji University) ;
  • Li, Jingpei (Department of Civil Engineering, Tongji University) ;
  • Sun, De'an (Department of Civil Engineering, Shanghai University)
  • 투고 : 2020.05.10
  • 심사 : 2020.10.08
  • 발행 : 2020.11.10
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents a kinematic limit analysis for passive earth pressure of rigid retaining structures considering the unsaturation of the backfill. Particular emphasis in the current work is focused on the effects of the spatial change in the degree of saturation on the passive earth pressure under different steady-infiltration/evaporation conditions. The incorporation of change of effective unit weight with degree of saturation is the main contribution of this study. The problem is formulated based on the log-spiral failure model rather than the linear wedge failure model, in which both the spatial variations of suction and soil effective unit weight are taken into account. Parametric studies, which cover a wide range of flow conditions, soil types and properties, wall batter, back slope angle as well as the interface friction angle, are performed to investigate the effects of these factors on the passive pressure and the corresponding shape of potential failure surfaces in the backfill. The results reveal that the flow conditions have significant effects on the suction and unit weight of the clayey backfill, and hence greatly impact the passive earth pressure of retaining structures. It is expected that present study could provide an insight into evaluation of the passive earth pressure of retaining structures with unsaturated backfills.

키워드

과제정보

The research described in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 41772290).

참고문헌

  1. Craig, R.F. (2004), Craig's Soil Mechanics, 7th Edition, Spon Press, London, England, U.K.
  2. Damiano, E., Olivares, L. and Picarelli, L. (2012), "Steep-slope monitoring in unsaturated pyroclastic soils", Eng. Geol., 137-138(6), 1-12. https://doi.org/10.1016/j.enggeo.2012.03.002.
  3. Deng, B. and Yang, M. (2019), "Analysis of passive Earth pressure for unsaturated retaining structures", Int. J. Geomech., 19(12), 06019016. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001518.
  4. Ebrahimi, S. (2011), "Extension of Mononobe-Okabe approach to unstable slopes", M.Sc. Thesis, University of Delaware, Newark, Delaware, U.S.A.
  5. Fathipour, H., Siahmazgi, A.S., Payan, M. and Chenari, R.J. (2020), "Evaluation of the lateral earth pressure in unsaturated soils with finite element limit analysis using second-order cone programming", Comput. Geotech., 125, 103587. https://doi.org/10.1016/j.compgeo.2020.103587.
  6. Gao, Y.F., Wu, D., Zhang, F., Lei, G.H., Qin, H. and Qiu, Y. (2016), "Limit analysis of 3D rock slope stability with nonlinear failure criterion", Geomech. Eng., 10(1), 59-76. https://doi.org/10.12989/gae.2016.10.1.059.
  7. Gao, Y.F., Zhang, F., Lei, G.H. and Li, D.Y. (2013), "An extended limit analysis of three-dimensional slope stability", Geotechnique, 63(6), 518-524. https://doi.org/10.1680/geot.12.T.004.
  8. Gardner, W.R. (1958), "Some steady state solutions of the unsaturated moisture flow equation with application to evaporation from a water table", Soil Sci., 85(4), 228-232. https://doi.org/10.1097/00010694-195804000-00006.
  9. Godt, J.W., Baum, R. and Lu, N. (2009), "Landsliding in partially saturated materials", Geophys. Res. Lett., 36(2), L02403. https://doi.org/10.1029/2008GL035996.
  10. Keskin, M.S. and Laman, M. (2014), "Experimental study of bearing capacity of strip footing on sand slope reinforced with tire chips", Geomech. Eng., 6(3), 249-262. https://doi.org/10.12989/gae.2014.6.3.249.
  11. Kim, S.K. and Borden, R.H. (2013), "Numerical simulation of MSE wall behavior induced by surface-water infiltration", J. Geotech. Geoenviron. Eng., 139(12), 2110-2124. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000927.
  12. Koerner, R.M. and Koerner, G.R. (2013), "A data base, statistics and recommendations regarding 171 failed geosynthetic reinforced mechanically stabilized earth (MSE) walls", Geotext. Geomembranes, 40, 20-27. https://doi.org/10.1016/j.geotexmem.2013.06.001.
  13. Krabbenhoft, K. (2017), "Static and seismic earth pressure coefficients for vertical walls with horizontal backfill", Soil Dyn. Earthq. Eng., 104, 403-407. https://doi.org/10.1016/j.soildyn.2017.11.011.
  14. Lim, K., Li, A.J. and Lyamin, A.V. (2015), "Three-dimensional slope stability assessment of two-layered undrained clay", Comput. Geotech., 70, 1-17. https://doi.org/10.1016/j.compgeo.2015.07.011.
  15. Lu, N. and Likos, W.J. (2004), Unsaturated soil mechanics, Wiley, New York, U.S.A.
  16. Lu, N. and Likos, W.J. (2006), "Suction stress characteristic curve for unsaturated soil", J. Geotech. Geoenviron. Eng., 132(2), 131-142. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:2(131).
  17. 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), 1-142. https://doi.org/10.1029/2009WR008646.
  18. Lu, N., Kaya, M., Collins, B.D. and Godt, J.W. (2013), "Hysteresis of unsaturated hydromechanical properties of a silty soil", J. Geotech. Geoenviron. Eng., 139(3), 507-510. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000786.
  19. Michalowski, R.L. and Drescher, A. (2009), "Three-dimensional stability of slopes and excavations" Geotechnique, 59(10), 839-850. https://doi.org/10.1680/geot.8.P.136.
  20. Mualem, Y. (1976), "A new model for predicting hydraulic conductivity of unsaturated porous media", Water Resour. Res., 12(3), 513-522. https://doi.org/10.1029/wr012i003p00513.
  21. Prakash, K., Sridharan, A., Thejas, H.K. and Swaroop, H.M. (2012), "A simplified approach of determining the specific gravity of soil solids", Geotech. Geol. Eng., 30(4), 1063-1067. https://doi.org/10.1007/s10706-012-9521-6.
  22. Rahardjo, H., Rezaur, R.B., Leong, E.C., Alonso, E.E., Lloret, A. and Gens, A. (2008), "Monitoring and modeling of slope response to climatic changes", Proceedings of the 10th International Symposium on Landslides and Engineered Slopes, Xi'an, China, June-July.
  23. Sahoo, J.P. and Ganesh, R. (2017), "Active earth pressure on retaining walls with unsaturated soil backfill", Proceedings of the International Congress and Exhibition "Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology, Sharm Elsheikh, Egypt, July.
  24. Vahedifard, F., Leshchinsky, B.A., Mortezai, K. and Lu, N. (2015), "Active earth pressures for unsaturated retaining structures", J. Geotech. Geoenviron. Eng., 141(11), 04015048. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001356.
  25. Vahedifard, F., Leshchinsky, B.A., Sehat, S. and Leshchinsky, D. (2014), "Impact of cohesion on seismic design of geosyntheticreinforced earth structures", J. Geotech. Geoenviron. Eng., 140(6), 04014016. https://doi.org/10.1061/(ASCE)gt.1943-5606.0001099.
  26. Vahedifard, F., Leshchinsky, D., Mortezaei, K. and Lu, N. (2016), "Effective stress-based limit-equilibrium analysis for homogeneous unsaturated slopes", Int. J. Geomech., 16(6), 04016003. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000554.
  27. Valentine, R.J. (2013), "An assessment of the factors that contribute to the poor performance of geosynthetic-reinforced earth retaining walls", Proceedings of the International Symposium on Design and Practice of Geosynthetic-Reinforced Soil Structures, Bologna, Italy, October.
  28. Van Genuchten, M.Th. (1980), "A closed-form equation for predicting the hydraulic conductivity of unsaturated soils", Soil Sci. Soc. Am. J., 44(5), 892-898. https://doi.org/10.2136/sssaj1980.03615995004400050002x.
  29. Veiskarami, M., Jamshidi Chenari, R. and Jameei, A.A. (2018), "A study on the static and seismic earth pressure problems in anisotropic granular media", Geotech. Geol. Eng., 37(3), 1987-2005. https://doi.org/10.1007/s10706-018-0739-9.
  30. Yamaguchi, K., Takeuchi, N. and Hamasaki, E. (2018), "Threedimensional simplified slope stability analysis by hybrid-type penalty method", Geomech. Eng., 15(4), 947-955. https://doi.org/10.12989/gae.2018.15.4.947.
  31. Yang, X.L. and Liu Z.A. (2018), "Reliability analysis of threedimensional rock slope", Geomech. Eng., 15(6), 1183-1191. https://doi.org/10.12989/gae.2018.15.6.1183.
  32. Yang, X.L. and Xu, J.S. (2017), "Three-dimensional stability of two-stage slope in inhomogeneous soils", Int. J. Geomech., 17(7), 06016045. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000867.
  33. Yoo, C. and Jung, H. (2006), "Case history of geosynthetic reinforced segental retaining wall failure", J. Geotech. Geoenviron. Eng., 132(12), 1538-1548. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:12(1538).