Pullout Behavior of Triaxial Geogrid Embedded in a Transparent Soil
Publication: International Journal of Geomechanics
Volume 21, Issue 3
Abstract
Geogrids with triangular apertures are increasingly being used as a reinforcement element in various geotechnical structures because of their characteristics to offer uniform resistance in all directions. In the present study, the load–displacement characteristics of triaxial geogrid in longitudinal (machine direction, MD) and transverse (cross-machine direction, XMD) directions under pullout conditions were evaluated for various normal stresses. Transparent soil made of fused quartz sand and transparent fluid (mineral oils) was used to quantify the soil and geogrid displacement under pullout conditions through image analysis, so that both the global and local failure modes of the triaxial geogrid can be assessed. The geogrid strain at failure under pullout and multirib tensile test conditions was compared to understand the failure modes of the triaxial geogrid in MD and XMD. The triaxial geogrid in XMD had experienced larger geogrid displacement when compared with MD, and the difference in the displacement is prominent with the increase in the normal stress. For identical normal stress and clamp displacement, the extent of the shear zone was larger for geogrid tested in XMD than MD. The test results also reveal that the triaxial geogrid has failed by pullout under lower normal stresses but has also failed by rupture under relatively higher stresses, irrespective of geogrid orientation. Interestingly, under lower normal stresses, the triaxial geogrid oriented in XMD had a deformed in-plane, while in MD, out-plane geogrid deflection was noted. With the increase in the normal stress, the node rupture was noted when oriented in XMD but failed by rib rupture when oriented in MD.
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Acknowledgments
The authors appreciate the financial support provided by the Natural Science Foundation of China (NSFC) (Grant Nos. 41772289, 41572266, and 41502275), and the Shanghai International Science and Technology Cooperation Fund (Grant No. 18230742700). The third author Dr. Sathiyamoorthy Rajesh from the Indian Institute of Technology Kanpur is thankful for the Talented Young Scientist Program supported by China Science and Technology Exchange Center.
Notation
The following symbols are used in this paper:
- D50
- median diameter of fused quartz;
- Dr
- density of transparent soil;
- Le
- length of reinforcement in the anchorage zone;
- Pm
- pullout capacity;
- Pr
- pullout resistance of the reinforcement per unit width
- Sm
- fracture displacement;
- x
- distance from clamp;
- X
- normalized distance from the clamp;
- α
- scale effect correlation factor to account for a nonlinear stress reduction over the embedded length of highly extensible reinforcements (α = 0.8 for geogrids);
- σ
- applied normal stress;
- effective vertical stress at the soil–reinforcement interfaces; and
- μ
- soil–geosynthetic interface apparent coefficient of friction.
References
ASTM. 2011. Standard test method for determining tensile properties of geogrids by the single or multi-rib tensile test. ASTM D6637-11. West Conshohocken, PA: ASTM.
ASTM. 2013. Standard test method for measuring geosynthetic pullout resistance in soil. ASTM D6706-01. West Conshohocken, PA: ASTM.
Barnett, C. M., A. G. Bengough, and B. M. McKenzie. 2009. “Quantitative image analysis of earthworm-mediated soil displacement.” Biol. Fertil. Soils 45 (8): 821–828. https://doi.org/10.1007/s00374-009-0392-9.
Bathurst, R. J., and F. M. Ezzein. 2015. “Geogrid and soil displacement observations during pullout using a transparent granular soil.” Geotech. Test. J. 38 (5): 20140145. https://doi.org/10.1520/GTJ20140145.
Bathurst, R. J., and F. M. Ezzein. 2016. “Geogrid pullout load-strain behaviour and modelling using a transparent granular soil.” Geosynth. Int. 23 (4): 271–286. https://doi.org/10.1680/jgein.15.00051.
Dash, S. K., K. Rajagopal, and N. R. Krishnaswamy. 2004. “Performance of different geosynthetic reinforcement materials in sand foundations.” Geosynth. Int. 11 (1): 35–42. https://doi.org/10.1680/gein.2004.11.1.35.
Dong, Y. L., J. Han, and X.-H. Bai. 2011. “Numerical analysis of tensile behavior of geogrids with rectangular and triangular apertures.” Geotext. Geomembr. 29 (2): 83–91. https://doi.org/10.1016/j.geotexmem.2010.10.007.
Ezzein, F. M., and R. J. Bathurst. 2011. “A transparent sand for geotechnical laboratory modeling.” Geotech. Test. J. 34 (6): 590–601. https://doi.org/10.1520/GTJ103808.
Ezzein, F. M., and R. J. Bathurst. 2014. “A new approach to evaluate soil-geosynthetic interaction using a novel pullout test apparatus and transparent granular soil.” Geotext. Geomembr. 42 (3): 246–255. https://doi.org/10.1016/j.geotexmem.2014.04.003.
Farrag, K., Y. B. Acar, and I. Juran. 1993. “Pull-out resistance of geogrid reinforcements.” Geotext. Geomembr. 12 (2): 133–159. https://doi.org/10.1016/0266-1144(93)90003-7.
FHWA (Federal Highway Administration). 2001. Mechanical stabilized earth walls and reinforced soil slopes design & construction guidelines. FHWA-NHI-00-043. Washington, DC: US Dept. of Transportation, Federal Highway Administration.
Gioffre, D., and N. Moraci. 2017. “Modelling interference between the geogrid bearing members under pullout loading conditions.” Geotext. Geomembr. 45 (3): 169–177. https://doi.org/10.1016/j.geotexmem.2017.01.008.
Hamid, T. B., and G. A. Miller. 2009. “Shear strength of unsaturated soil interfaces.” Can. Geotech. J. 46 (5): 595–606. https://doi.org/10.1139/T09-002.
Iskander, M., R. J. Bathurst, and M. Omidvar. 2015. “Past, present, and future of transparent soils.” Geotech. Test. J. 38 (5): 20150079. https://doi.org/10.1520/GTJ20150079.
Keane, R. D., and R. J. Adrian. 1992. “Theory of cross-correlation analysis of PIV images.” Appl. Sci. Res. 49 (3): 191–215. https://doi.org/10.1007/BF00384623.
Koerner, R. M. 2012. Designing with geosynthetics. 6th ed. Bloomington, IN: XLIBRIS Publishers.
Koerner, R. M., M. H. Wayne, and R. G. Carroll. 1989. “Analytic behavior of geogrid anchorage.” In Proc., Geosynthetics’89 Conf., 525–536. San Diego: IFAI.
Latha, G. M., K. Rajagopal, and N. R. Krishnaswamy. 2006. “Experimental and theoretical investigations on geocell-supported embankments.” Int. J. Geomech. 6 (1): 30–35. https://doi.org/10.1061/(ASCE)1532-3641(2006)6:1(30).
Leshchinsky, D., and R. H. Boedeker. 1989. “Geosynthetic reinforced soil structures.” J. Geotech. Eng. 115 (10): 1459–1478. https://doi.org/10.1061/(ASCE)0733-9410(1989)115:10(1459).
Lopes, M. L., and M. Ladeira. 1996a. “Influence of the confinement, soil density and displacement rate on soil-geogrid interaction.” Geotext. Geomembr. 14: 543–554. https://doi.org/10.1016/S0266-1144(97)83184-6.
Lopes, M. L., and M. Ladeira. 1996b. “Role of specimen geometry, soil height and sleeve length on the pull-out behaviour of geogrids.” Geosynthetics International 3 (6): 701–719. https://doi.org/10.1680/gein.3.0081.
Moraci, N., and P. Recalcati. 2006. “Factors affecting the pullout behaviour of extruded geogrids embedded in a compacted granular soil.” Geotext. Geomembr. 24 (22): 220–242. https://doi.org/10.1016/j.geotexmem.2006.03.001.
Palmeira, E. M. 1987. “The study of soil–reinforcement interaction by means of large scale laboratory tests.” Ph.D. thesis, Dept. of Mathematical, Physical & Life Sciences, Division–Engineering Science, Univ. of Oxford.
Palmeira, E. M. 2009. “Soil–geosynthetic interaction: Modelling and analysis.” Geotext. Geomembr. 27 (5): 368–390. https://doi.org/10.1016/j.geotexmem.2009.03.003.
Palmeira, E. M., and G. W. E. Milligan. 1989. “Scale and other factors affecting the results of pull-out tests of grids buried in sand.” Géotechnique 39 (3): 511–542. https://doi.org/10.1680/geot.1989.39.3.511.
Peng, X., and J. G. Zornberg. 2019. “Evaluation of soil–geogrid interaction using transparent soil with laser illumination.” Geosynth. Int. 26 (2): 206–221. https://doi.org/10.1680/jgein.19.00004.
Rajesh, S., and B. V. S. Viswanadham. 2009. “Evaluation of geogrid as a reinforcement layer in clay based engineered barriers.” Appl. Clay Sci. 46 (2): 153–165. https://doi.org/10.1016/j.clay.2009.07.019.
Rajesh, S., and B. V. S. Viswanadham. 2011. “Hydro-mechanical behavior of geogrid-reinforced soil barriers of landfill covers systems.” Geotext. Geomembr. 29 (1): 51–64. https://doi.org/10.1016/j.geotexmem.2010.06.010.
Rajesh, S., and B. V. S. Viswanadham. 2012. “Centrifuge modeling and instrumentation of geogrid-reinforced soil barriers of landfill covers.” J. Geotech. Geoenviron. Eng. 138 (1): 26–37. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000559.
Rajesh, S., and B. V. S. Viswanadham. 2015. “Numerical simulation of geogrid-reinforced soil barriers subjected to differential settlements.” Int. J. Geomech. 15 (4): 04014062. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000405.
Raju, D. M., and R. J. Fannin. 1998. “Load–strain–displacement response of geosynthetics in monotonic and cyclic pullout.” Canadian Geotechnical Journal 35 (2): 183–193. https://doi.org/10.1139/t97-088.
Scarano, F., and M. L. Riethmuller. 2000. “Advances in iterative multigrid PIV image processing.” Exp. Fluids 29 (1): S051–S060. https://doi.org/10.1007/s003480070007.
Sugimoto, M., A. M. N. Alagiyawanna, and K. Kadoguchi. 2001. “Influence of rigid and flexible face on geogrid pullout tests.” Geotext. Geomembr. 19 (5): 257–https://doi.org/10.1016/S0266-1144(01)00011-5.
Taylor, R. N., R. J. Grant, S. Robson, and J. Kuwano. 1998. “An image analysis system for determining plane and 3-D displacements.” In Proc. of centrifuge 98, edited by T. Kimura, O. Kusakabe, and J. Takemura, 73–78. Rotterdam, Netherlands: A.A. Balkema.
Viswanadham, B. V. S., and S. Rajesh. 2009. “Centrifuge model tests on clay based engineered barriers subjected to differential settlements.” Appl. Clay Sci. 42 (3–4): 460–472. https://doi.org/10.1016/j.clay.2008.06.002.
White, D. J., W. A. Take, and M. D. Bolton. 2003. “Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry.” Géotechnique 53 (7): 619–631. https://doi.org/10.1680/geot.2003.53.7.619.
Xu, C., and X. Y. Liao. 2011. “Researches on interaction mechanism between geogrid and sand by pull-out tests.” Rock Soil Mech. 32 (2): 423–428.
Zheng, J. J., W. Z. Cao, Y. J. Zhou, and J. G. Jiang. 2017. “Pull-out test study of interface behavior between triaxial geogrid and soil.” Rock Soil Mech. 38 (2): 317–324.
Zhou, J., J. F. Chen, J. F. Xue, and J.-Q. Wang. 2012. ‘“Micro-mechanism of the interaction between sand and geogrid transverse ribs.”’ Geosynth. Int. 19 (6): 426–437. https://doi.org/10.1680/gein.12.00028.
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Published In
International Journal of Geomechanics
Volume 21 • Issue 3 • March 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 23, 2019
Accepted: Oct 1, 2020
Published online: Jan 6, 2021
Published in print: Mar 1, 2021
Discussion open until: Jun 6, 2021
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