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http://dx.doi.org/10.12989/gae.2019.18.3.315

Small- and large-scale analysis of bearing capacity and load-settlement behavior of rock-soil slopes reinforced with geogrid-box method  

Moradi, Gholam (Faculty of Civil Engineering, University of Tabriz)
Abdolmaleki, Arvin (Faculty of Civil Engineering, University of Tabriz)
Soltani, Parham (Department of Textile Engineering, Isfahan University of Technology)
Publication Information
Geomechanics and Engineering / v.18, no.3, 2019 , pp. 315-328 More about this Journal
Abstract
This paper presents an investigation on bearing capacity, load-settlement behavior and safety factor of rock-soil slopes reinforced using geogrid-box method (GBM). To this end, small-scale laboratory studies were carried out to study the load-settlement response of a circular footing resting on unreinforced and reinforced rock-soil slopes. Several parameters including unit weight of rock-soil materials (loose- and dense-packing modes), slope height, location of footing relative to the slope crest, and geogrid tensile strength were studied. A series of finite element analysis were conducted using ABAQUS software to predict the bearing capacity behavior of slopes. Limit equilibrium and finite element analysis were also performed using commercially available software SLIDE and ABAQUS, respectively to calculate the safety factor. It was found that stabilization of rock-soil slopes using GBM significantly improves the bearing capacity and settlement behavior of slopes. It was established that, the displacement contours in the dense-packing mode distribute in a broader and deeper area as compared with the loose-packing mode, which results in higher ultimate bearing load. Moreover, it was found that in the loose-packing mode an increase in the vertical pressure load is accompanied with an increase in the soil settlement, while in the dense-packing mode the load-settlement curves show a pronounced peak. Comparison of bearing capacity ratios for the dense- and loose-packing modes demonstrated that the maximum benefit of GBM is achieved for rock-soil slopes in loose-packing mode. It was also found that by increasing the slope height, both the initial stiffness and the bearing load decreases. The results indicated a significant increase in the ultimate bearing load as the distance of the footing to the slope crest increases. For all the cases, a good agreement between the laboratory and numerical results was observed.
Keywords
rock-soil slope; geogrid-box method; bearing capacity; safety factor; finite element analysis; limit equilibrium;
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1 Kusakabe, O., Yamaguchi, H. and Morikage, A. (1991), "Experiment and analysis on the scale effect of $N_{\gamma}$ for circular and rectangular footings", Proceedings of the International Conference on Centrifuge, Boulder, Colorado, U.S.A.
2 Ladd, R. (1978), "Preparing test specimens using undercompaction", Geotech. Test. J., 1(1), 16-23. https://doi.org/10.1520/GTJ10364J.   DOI
3 Mahboubi, A., Aminpour, M. and Noorzad, A. (2008), "Conventional and advanced numerical methods of rock slope stability analysis, A comparison study, Gotvand Dam Right Abutment (Iran) case study", Proceedings of the 12th International Conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG), Goa, India, October.
4 Meyerhof, G.G. (1963), "Some recent research on the bearing capacity of foundations", Can. Geotech. J., 1(1), 16-26. https://doi.org/10.1139/t63-003.   DOI
5 Moradi, G., Abdolmaleki, A., Soltani, P. and Ahmadvand, M. (2018), "A laboratory and numerical study on the effect of geogrid-box method on bearing capacity of rock-soil slopes", Geomech. Eng., 14(9), 345-354. https://doi.org/10.12989/gae.2018.14.4.345.
6 Mosallanezhad, M., Hataf, N. and Ghahramani, A. (2008), "Experimental study of bearing capacity of granular soils, reinforced with innovative grid-anchor system", Geotech. Geol. Eng., 26(3), 299-312.   DOI
7 Naeini, S., Rabe, B.K. and Mahmoodi, E. (2012), "Bearing capacity and settlement of strip footing on geosynthetic reinforced clayey slopes", J. Central South Univ., 19(4), 1116-1124. https://doi.org/10.1007/s11771-012-1117-z.   DOI
8 Nareeman, B.J. (2012), "A study on the scale effect on bearing capacity and settlement of shallow foundations", Int. J. Eng. Technol., 2(3), 480-488.
9 Prasad, B.D., Hariprasad, C. and Umashankar, B. (2016), "Load-settlement response of square footing on geogrid reinforced layered granular beds", Int. J. Geosynth. Ground Eng., 2(4), 36. https://doi.org/10.1007/s40891-016-0070-6.   DOI
10 Puzrin, A.M., Gray, T.E. and Hill, A.J. (2015), "Significance of the actual nonlinear slope geometry for catastrophic failure in submarine landslides", Proc. R. Soc. A Math. Phys. Eng. Sci., 471(2175), 20140772. https://doi.org/10.1098/rspa.2014.0772.   DOI
11 Ranjbarnia, M., Fahimifar, A. and Oreste, P. (2015), "Practical method for the design of pretensioned fully grouted rockbolts in tunnels", Int. J. Geomech., 16(1), 04015012. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000464.   DOI
12 Saleh Ahmadi, M. and Moghadam, P.N. (2017), "Effect of geogrid aperture size and soil particle size on geogrid-soil interaction under pull-out loading", J. Text. Polymers, 5(1), 25-30.
13 Spencer, E. (1967), "A method of analysis of the stability of embankments assuming parallel interslice forces", Geotechnique, 17, 11-26.   DOI
14 Srbulov, M. (2001), "Analyses of stability of geogrid reinforced steep slopes and retaining walls", Comput. Geotech., 28(4), 255-268. https://doi.org/10.1016/S0266-352X(00)00032-X.   DOI
15 Tavakoli, M.G., Ghanbari, A. and Mehdizadeh, H. (2016), "Experimental study on the behaviour of geogrid-reinforced slopes with respect to aggregate size", Geotext. Geomembranes, 44(6), 862-871. https://doi.org/10.1016/j.geotexmem.2016.06.006   DOI
16 Tavangar, Y. and Shooshpasha, I. (2016), "Experimental and numerical study of bearing capacity and effect of specimen size on uniform sand with medium density, reinforced with nonwoven geotextile", Arab. J. Sci. Eng., 41(10), 4127-4137. https://doi.org/10.1007/s13369-016-2101-y.   DOI
17 Touze-Foltz, N., Bannour, H., Barral, C. and Stoltz, G. (2016), "A review of the performance of geosynthetics for environmental protection", Geotext. Geomembranes, 44(5), 656-672. https://doi.org/10.1016/j.geotexmem.2016.05.008.   DOI
18 Turker, E., Sadoglu, E., Cure, E. and Uzuner, B.A. (2014), "Bearing capacity of eccentrically loaded strip footings close to geotextile-reinforced sand slope", Can. Geotech. J., 51(8), 884-895. https://doi.org/10.1139/cgj-2014-0055.   DOI
19 Ukritchon, B., Whittle, A.J. and Klangvijit, C. (2003), "Calculations of bearing capacity factor $N_{\gamma}$ using numerical limit analyses", J. Geotech. Geoenviron. Eng., 129(5), 468-474. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:6(468).   DOI
20 Unnikrishnan, N. and Rajan, S. (2012), "Bearing capacity of strip footings on geosynthetic encapsulated granular trenches", Proceedings of the International Conference on Ground Improvement and Ground Control, Wollongong, Australia, October-November.
21 Viswanadham, B.V.S. and Konig, D. (2009), "Centrifuge modeling of geotextile-reinforced slopes subjected to differential settlements", Geotext. Geomembranes, 27(2), 77-88. https://doi.org/10.1016/j.geotexmem.2008.09.008.   DOI
22 Won, J., You, K., Jeong, S. and Kim, S. (2005), "Coupled effects in stability analysis of pile-slope systems", Comput. Geotech., 32(4), 304-315. https://doi.org/10.1016/j.compgeo.2005.02.006.   DOI
23 Xiao, S., Feng, W. and Zhang, J. (2010), "Analysis of the effects of slope geometry on the dynamic response of a near-field mountain from the Wenchuan Earthquake", J. Mountain Sci., 7(4), 353-360. https://doi.org/10.1007/s11629-010-2055-6.   DOI
24 Xu, D.S. and Yin, J.H. (2016), "Analysis of excavation induced stress distributions of GFRP anchors in a soil slope using distributed fiber optic sensors", Eng. Geol., 213, 55-63. https://doi.org/10.1016/j.enggeo.2016.08.011.   DOI
25 Yoo, C. (2001), "Laboratory investigation of bearing capacity behavior of strip footing on geogrid-reinforced sand slope", Geotext. Geomembranes, 19(5), 279-298. https://doi.org/10.1016/S0266-1144(01)00009-7.   DOI
26 Zhang, X. and Zhou, X. (2018), "Analysis of the numerical stability of soil slope using virtual-bond general particle dynamics", Eng. Geol., 243, 101-110. https://doi.org/10.1016/j.enggeo.2018.06.018.   DOI
27 Zhu, F., Clark, J.I. and Phillips, R. (2001), "Scale effect of strip and circular footings resting on dense sand", J. Geotech. Geoenviron. Eng., 127(7), 613-621. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:7(613).   DOI
28 Alejano, L., Pons, B., Bastante, F., Alonso, E. and Stockhausen, H. (2007), "Slope geometry design as a means for controlling rockfalls in quarries", Int. J. Rock Mech. Min. Sci., 44(6), 903-921. https://doi.org/10.1016/j.ijrmms.2007.02.001.   DOI
29 Abhishek, S., Rajyalakshmi, K. and Madhav, M. (2015), "Bearing capacity of strip footing on reinforced foundation bed over soft ground with granular trench", Ind. Geotech. J., 45(3), 304-317. https://doi.org/10.1007/s40098-014-0138-y.   DOI
30 Alamshahi, S. and Hataf, N. (2009), "Bearing capacity of strip footings on sand slopes reinforced with geogrid and grid-anchor", Geotext. Geomembr., 27(3), 217-226. https://doi.org/10.1016/j.geotexmem.2008.11.011.   DOI
31 Alkasawneh, W., Malkawi, A.I.H., Nusairat, J.H. and Albataineh, N. (2008), "A comparative study of various commercially available programs in slope stability analysis", Comput. Geotech., 35(3), 428-435. https://doi.org/10.1016/j.compgeo.2007.06.009.   DOI
32 Ashtiani, M., Ghalandarzadeh, A. and Towhata, I. (2015), "Centrifuge modeling of shallow embedded foundations subjected to reverse fault rupture", Can. Geotech. J., 53(3), 505-519. https://doi.org/10.1139/cgj-2014-0444.   DOI
33 Ausilio, E., Conte, E. and Dente, G. (2001), "Stability analysis of slopes reinforced with piles", Comput. Geotech., 28(8), 591-611. https://doi.org/10.1016/S0266-352X(01)00013-1.   DOI
34 Berry, D.S. (1935), Stability of Granular Mixtures, University of Michigan, Michigan, U.S.A.
35 Bishop, A.W. (1955), "The use of the slip circle in the stability analysis of slopes", Geotechnique, 5(1), 7-17.   DOI
36 Bouassida, M., Jellali, B. and Lyamin, A. (2014), "Ultimate bearing capacity of a strip footing on ground reinforced by a trench", Int. J. Geomech., 15(3), 06014021. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000418.   DOI
37 Cerato, A.B. and Lutenegger, A.J. (2007), "Scale effects of shallow foundation bearing capacity on granular material", J. Geotech. Geoenviron. Eng., 133(10), 1192-1202. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:10(1192).   DOI
38 Chung, W. and Cascante, G. (2007), "Experimental and numerical study of soil-reinforcement effects on the low-strain stiffness and bearing capacity of shallow foundations", Geotech. Geol. Eng., 25(3), 265-281. https://doi.org/10.1007/s10706-006-9109-0.   DOI
39 Conte, E. and Troncone, A. (2018), "A performance-based method for the design of drainage trenches used to stabilize slopes", Eng. Geol., 239, 158-166. https://doi.org/10.1016/j.enggeo.2018.03.017.   DOI
40 Demir, A., Yildiz, A., Laman, M. and Ornek, M. (2014), "Experimental and numerical analyses of circular footing on geogrid-reinforced granular fill underlain by soft clay", Acta Geotechnica, 9(4), 711-723. https://doi.org/10.1007/s11440-013-0207-x.   DOI
41 El Sawwaf, M. (2010), "Experimental and numerical study of strip footing supported on stabilized sand slope", Geotech. Geol. Eng., 28(4), 311-323. https://doi.org/10.1007/s10706-009-9293-9.   DOI
42 El Sawwaf, M.A. (2007), "Behavior of strip footing on geogrid-reinforced sand over a soft clay slope", Geotext. Geomembranes, 25(1), 50-60. https://doi.org/10.1016/j.geotexmem.2006.06.001.   DOI
43 Fahimifar, A., Abdolmaleki, A. and Soltani, P. (2014), "Stabilization of rock slopes using geogrid boxes", Arab. J. Geosci., 7(2), 609-621. https://doi.org/10.1007/s12517-012-0755-7.   DOI
44 Fahimifar, A. and Soroush, H. (2005), "A theoretical approach for analysis of the interaction between grouted rockbolts and rock masses", Tunn. Undergr. Sp. Technol., 20(4), 333-343. https://doi.org/10.1016/j.tust.2004.12.005.   DOI
45 Fattah, M., Shlash, K. and Mohammed, H. (2014), "Bearing capacity of rectangular footing on sandy soil bounded by a wall", Arab. J. Sci. Eng., 39(11). https://doi.org/10.1007/s13369-014-1353-7.
46 Feng, S.J., Chen, Z.W., Chen, H.X., Zheng, Q.T. and Liu, R. (2018), "Slope stability of landfills considering leachate recirculation using vertical wells", Eng. Geol., 241, 76-85. https://doi.org/10.1016/j.enggeo.2018.05.013.   DOI
47 Gurocak, Z., Alemdag, S. and Zaman, M.M. (2008), "Rock slope stability and excavatability assessment of rocks at the Kapikaya Dam Site, Turkey", Eng. Geol., 96(1-2), 17-27. https://doi.org/10.1016/j.enggeo.2007.08.005.   DOI
48 Hataf, N. and Sadr, A. (2015), "Experimental, numerical and analytical study on conventional and innovative Grid-Anchor system in the pull-out test", Geomech. Geoeng., 10(3), 182-193. https://doi.org/10.1080/17486025.2014.933893.   DOI
49 Hou, J., Zhang, M.X., Dai, Z.H., Li, J.Z. and Zeng, F.F. (2017), "Bearing capacity of strip foundations in horizontal-vertical reinforced soils", Geotext. Geomembranes, 45(1), 29-34. https://doi.org/10.1016/j.geotexmem.2016.07.001.   DOI
50 Huang, M. and Jia, C.Q. (2003), "Strength reduction FEM in stability analysis of soil Slopes subjected to transient unsaturated seepage", Comput. Geotech., 36(1-2), 93-101. https://doi.org/10.1016/j.compgeo.2008.03.006.   DOI
51 Janbu, N. (1954), Application of Composite Slip Surface for Stability Analysis, Stockholm, Sweden.
52 Keskin, M.S. and Laman, M. (2014), "Experimental and numerical studies of strip footings on geogrid-reinforced sand slope", Arab. J. Sci. Eng., 39(3), 1607-1619. https://doi.org/10.1007/s13369-013-0795-7.   DOI
53 Kumar, J. and Khatri, V. (2008), "Effect of footing width on bearing capacity factor $N_{\gamma}$ for smooth strip footings", J. Geotech. Geoenviron. Eng., 134(9), 1299-1310. https://doi.org/10.1061/(ASCE)1090-0241(2008)134:9(1299).   DOI