Probabilistic Investigation on Bearing Capacity of Unsaturated Fly Ash
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 24, Issue 4
Abstract
The utilization of coal combustion residue waste generated by thermal power plants, such as fly ash, as a sustainable geomaterial in an efficient manner might reduce the hazard posed by it. A promising solution might be the bulk use of fly ash as fill material in geotechnical engineering projects. However, the bearing capacity of fly ash deposits, taking into consideration the unsaturated behavior has rarely been investigated. This necessitates the evaluation of the effects of water retention characteristics curve (WRCC) parameters and infiltration rate ratio in combination with the strength parameter on the bearing capacity of an unsaturated fly ash deposit. This study investigates the effects of these parameters on the bearing capacity of fly ash deposits through nonlinear finite element (FE) analyses. A probabilistic investigation is presented for determining the relative influences of these parameters on the bearing capacity and settlement considering the uncertainty of these parameters. This study indicates that the bearing capacity of the unsaturated fly ash deposit is significantly influenced by infiltration conditions in combination with the strength parameter. Prediction equations are framed for the bearing capacity and settlement of an unsaturated fly ash deposit considering variations of these parameters. The probability of failure of a strip footing on a fly ash deposit is then evaluated using the Monte Carlo (MC) simulation techniques for the developed prediction models.
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References
Abhijit, D., and S. Sreedeep. 2015. “Evaluation of measurement methodologies used for establishing water retention characteristic curve of fly ash.” J. Test. Eval. 43 (5): 20130091. https://doi.org/10.1520/JTE20130091.
Ahmad, M. S., and S. S. Shah. 2016. “Load settlement behaviour of fly ash mixed with waste sludge and cement.” Geotech. Geol. Eng. 34 (1): 37–58. https://doi.org/10.1007/s10706-015-9927-z.
Bachus, R. C., et al. 2019. “Characterization and engineering properties of dry and ponded class-F fly ash.” J. Geotech. Geoenviron. Eng. 145 (3): 04019003. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001986.
Baecher, G. B., and J. T. Christian. 2005. Reliability and statistics in geotechnical engineering. Hoboken, NJ: John Wiley & Sons.
Bera, A. K., A. Ghosh, and A. Ghosh. 2007. “Behaviour of model footing on pond ash.” Geotech. Geol. Eng. 25 (3): 315–325. https://doi.org/10.1007/s10706-006-9112-5.
Bhatt, A., S. Priyadarshini, A. A. Mohankrishnan, A. Abri, M. Sattler, and S. Techapaphawit. 2019. “Physical, chemical, and geotechnical properties of coal fly ash: A global review.” Case Stud. Constr. Mater. 11: e00263. https://doi.org/10.1016/j.cscm.2019.e00263.
Budhu, M., and A. Al-Karni. 1993. “Seismic bearing capacity of soils.” Géotechnique 43 (1): 181–187. https://doi.org/10.1680/geot.1993.43.1.181.
Costa, Y. D., J. C. Cintra, and J. C. Zornberg. 2003. “Influence of matric suction on the results of plate load tests performed on a lateritic soil deposit.” Geotech. Test. J. 26 (2): 219–226. https://doi.org/10.1520/GTJ11326J.
Cui, W., X. Zheng, and Q. Zhang. 2018. “Evaluation of bearing capacity of fly-ash highway subgrade based on model test.” J. Test. Eval. 46 (3): 943–955. https://doi.org/10.1520/JTE20170034.
Dai, S. H., and M. O. Wang. 1992. Reliability analysis in engineering applications. New York: Van Nostrand Reinhold.
Darcy, H. 1856. Les fontaines publiques de la ville de Dijon. Paris: Dalmont.
DiGioia, A. M., and W. L. Nuzzo. 1972. “Fly ash as structural fill.” J. Power Div. 98 (1): 77–92.
Fragaszy, R. J., and E. Lawton. 1984. “Bearing capacity of reinforced sand subgrades.” J. Geotech. Eng. 110 (10): 1500–1507. https://doi.org/10.1061/(ASCE)0733-9410(1984)110:10(1500).
Gardener, 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.
Ghosh, A., and U. Dey. 2009. “Bearing ratio of reinforced fly ash overlying soft soil and deformation modulus of fly ash.” Geotext. Geomembr. 27 (4): 313–320. https://doi.org/10.1016/j.geotexmem.2008.12.002.
Ghosh, A., A. Ghosh, and A. K. Bera. 2005. “Bearing capacity of square footing on pond ash reinforced with jute-geotextile.” Geotext. Geomembr. 23 (2): 144–173. https://doi.org/10.1016/j.geotexmem.2004.07.002.
Ghosh, A., and C. Subbarao. 2006. “Tensile strength bearing ratio and slake durability of class F fly ash stabilized with lime and gypsum.” J. Mater. Civ. Eng. 18 (1): 106–115. https://doi.org/10.1061/(ASCE)0899-1561(2006)18:1(18).
Ghosh, A., and C. Subbarao. 2007. “Strength characteristics of class F fly ash modified with lime and gypsum.” J. Geotech. Geoenviron. Eng. 133 (7): 757–766. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:7(757).
Gill, K. S., A. K. Choudhary, J. N. Jha, and S. K. Shukla. 2013. “Experimental and numerical studies of loaded strip footing resting on reinforced fly ash slope.” Geosynth. Int. 20 (1): 13–25. https://doi.org/10.1680/gein.12.00036.
Gray, D. H., and Y. K. Lin. 1972. “Engineering properties of compacted fly ash.” J. Soil Mech. Found. Div. 98 (4): 361–380.
Griffiths, D. V., and N. Lu. 2005. “Unsaturated slope stability analysis with steady infiltration or evaporation using elasto-plastic finite elements.” Int. J. Numer. Anal. Methods Geomech. 29 (3): 249–267. https://doi.org/10.1002/nag.413.
Hamrouni, A., B. Sbartai, and D. Dias. 2018. “Probabilistic analysis of ultimate seismic bearing capacity of strip foundations.” J. Rock Mech. Geotech. Eng. 10 (4): 717–724. https://doi.org/10.1016/j.jrmge.2018.01.009.
Jakka, R. S., G. V. Ramana, and M. Datta. 2010. “Shear behaviour of loose and compacted pond ash.” Geotech. Geol. Eng. 28 (6): 763–778. https://doi.org/10.1007/s10706-010-9337-1.
Jimenez-Rodriguez, R., N. Sitar, and J. Chacon. 2006. “System reliability approach to rock slope stability.” Int. J. Rock Mech. Min. Sci. 43 (6): 847–859. https://doi.org/10.1016/j.ijrmms.2005.11.011.
Kaniraj, S. R., and V. G. Havanagi. 2001. “Behaviour of cement stabilized fiber reinforced fly ash soil mixtures.” J. Geotech. Geoenviron. Eng. 127 (7): 574–584. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:7(574).
Kaushik, N. P., G. Ramasamy. 1999. “Performance of compacted ash test fills.” In Fly Ash disposal and deposition: Beyond 2000 A.D., edited by U. Dayal, R. Sinha, and V. Kumar, 149–155. New Delhi, India: Narosa Publishing House.
Kawa, M., and W. Pula. 2020. “3D bearing capacity probabilistic analyses of footings on spatially variable c-ϕ soil.” Acta Geotech. 15 (6): 1453–1466. https://doi.org/10.1007/s11440-019-00853-3.
Kim, B., M. Prezzi, and R. Salgado. 2005. “Geotechnical properties of fly and bottom ash mixtures for use in highway embankments.” J. Geotech. Geoenviron. Eng. 131 (7): 914–924. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:7(914).
Kramer, S. L. 1996. Geotechnical earthquake engineering. Noida, India: Pearson Education India.
Kumar, J. 2009. “The variation of Nγ with footing roughness using the method of characteristics.” Int. J. Numer. Anal. Methods Geomech. 33 (2): 275–284. https://doi.org/10.1002/nag.716.
Leonards, G. A., and B. Bailey. 1982. “Pulvrerised coal ash as structural fill.” J. Geotech. Eng. Div. 108 (40): 517–531.
Li, D. Q., L. Wang, Z. J. Cao, and X. H. Qi. 2019. “Reliability analysis of unsaturated slope stability considering SWCC model selection and parameter uncertainties.” Eng. Geol. 260: 105207. https://doi.org/10.1016/j.enggeo.2019.105207.
Li, Z. W., and X. L. Yang. 2018. “Stability of 3D slope under steady unsaturated flow condition.” Eng. Geol. 242: 150–159. https://doi.org/10.1016/j.enggeo.2018.06.004.
Lu, N., J. W. Godt, and D. T. Wu. 2010. “A closed-form equation for effective stress in unsaturated soil.” Water Resour. Res. 46 (5): W05515. https://doi.org/10.1029/2009WR008646.
Lu, N., and W. J. Likos. 2004. Unsaturated soil mechanics. New York: Wiley.
Lu, N., and W. J. Likos. 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).
Markovic, R. D. 1965. Probability functions of best fit to distributions of annual precipitation and runoff. Hydrology Paper No. 8. Fort Collins, CO: Colorado State Univ.
Martin, J. P., R. A. Collins, J. S. Browning, and F. J. Biehl. 1990. “Properties and use of fly ashs for embankments.” J. Energy Eng. 116 (2): 71–86. https://doi.org/10.1061/(ASCE)0733-9402(1990)116:2(71).
Massih, D. S. Y. A., A. H. Soubra, and B. K. Low. 2008. “Reliability-based analysis and design of strip footings against bearing capacity failure.” J. Geotech. Geoenviron. Eng. 134 (7): 917–928. https://doi.org/10.1061/(ASCE)1090-0241(2008)134:7(917).
McLaren, R. J., and A. M. DiGioia. 1987. “The typical engineering properties of fly ash.” In Proc., Geotechnical Practice for Waste Disposal, edited by E. Wood, 683–697. New York: ASCE.
Mohamed, F. M. O., and S. K. Vanapalli. 2006. “Laboratory investigations for the measurement of the bearing capacity of an unsaturated coarse-grained soil.” In Proc., 59th Canadian Geotechnical Conf., 219–226. Vancouver, BC, Canada: Canadian Geotechnical Society.
Montgomery, D. 2013. Design and analysis of experiments. New York: Wiley.
Myers, R. H., D. C. Montgomery, and C. M. Anderson-Cook. 2016. Response surface methodology: Process and product optimization using designed experiments. New York: Wiley.
Nadaf, M. B., S. Dutta, and J. N. Mandal. 2019. “Fly ash as backfill material in slopes using waste pet bottles as reinforcement.” In Waste management and resource efficiency, edited by S. Ghosh. Singapore: Springer.
Nadaf, M. B., and J. N. Mandal. 2017. “Behaviour of reinforced fly ash slopes with cellular mattress and strips under strip loading.” J. Hazard. Toxic Radioact. Waste 21 (4): 04017019. https://doi.org/10.1061/(ASCE)HZ.2153-5515.0000376.
Oh, W. T., and S. K. Vanapalli. 2011. “Modelling the applied vertical stress and settlement relationship of shallow foundations in saturated and unsaturated sands.” Can. Geotech. J. 48 (3): 425–438. https://doi.org/10.1139/T10-079.
Oh, W. T., and S. K. Vanapalli. 2013. “Interpretation of the bearing capacity of unsaturated fine-grained soil using the modified effective and the modified total stress approaches.” Int. J. Geomech. 13 (6): 769–778. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000263.
Oh, W. T., and S. K. Vanapalli. 2018. “Modeling the stress versus settlement behavior of shallow foundations in unsaturated cohesive soils extending the modified total stress approach.” Soils Found. 58 (2): 382–397. https://doi.org/10.1016/j.sandf.2018.02.008.
Oloo, S. Y., D. G. Fredlund, and J. K. M. Gan. 1997. “Bearing capacity of unpaved roads.” Can. Geotech. J. 34 (3): 398–407. https://doi.org/10.1139/t96-084.
Pandian, N. S. 2004. “Fly ash characterization with reference to geotechnical applications.” J. Indian Inst. Sci. 84: 189–216.
Phoon, K. K., A. Santoso, and S. T. Quek. 2010. “Probabilistic analysis of soil-water characteristic curves.” J. Geotech. Geoenviron. Eng. 136 (3): 445–455. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000222.
Popescu, R., G. Deodatis, and A. Nobahar. 2005. “Effects of random heterogeneity of soil properties on bearing capacity.” Probab. Eng. Mech. 20 (4): 324–341. https://doi.org/10.1016/j.probengmech.2005.06.003.
Prakash, A., B. Hazra, A. Deka, and S. Sreedeep. 2017. “Probabilistic analysis of water retention characteristic curve of fly ash.” Int. J. Geomech. 17 (12): 04017111. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001024.
Prakash, A., B. Hazra, and S. Sreedeep. 2019a. “Probabilistic analysis of unsaturated fly ash slope.” J. Hazard. Toxic Radioact. Waste 23 (1): 06018002. https://doi.org/10.1061/(ASCE)HZ.2153-5515.0000428.
Prakash, A., B. Hazra, and S. Sreedeep. 2019b. “Uncertainty quantification in water retention characteristic curve of fly ash using copulas.” J. Test. Eval. 47 (4): 20170244. https://doi.org/10.1520/JTE20170244.
Ramasamy, G., and S. S. Pusadkar. 2007. “Settlement of footing on compacted ash bed.” J. Geotech. Geoenviron. Eng. 133 (11): 1462–1465. https://doi.org/10.1061/(ASCE)1090-0241(2007)133:11(1462).
Ravichandran, N., V. Mahmoudabadi, and S. Shrestha. 2017. “Analysis of the bearing capacity of shallow foundation in unsaturated soil using Monte-Carlo simulation.” Int J. Geosci. 8 (10): 1231–1250. https://doi.org/10.4236/ijg.2017.810071.
Rosenblueth, E. 1975. “Point estimates for probability moments.” Proc. Natl. Acad. Sci. 72 (10): 3812–3814. https://doi.org/10.1073/pnas.72.10.3812.
Sireesh, S., T. G. Sitharam, and S. K. Dash. 2009. “Bearing capacity of circular footing on geocell-sand mattress overlying clay bed with void.” Geotext. Geomembr. 27 (2): 89–98. https://doi.org/10.1016/j.geotexmem.2008.09.005.
Tang, Y., H. A. Taiebat, and A. R. Russell. 2017. “Bearing capacity of shallow foundations in unsaturated soil considering hydraulic hysteresis and three drainage conditions.” Int. J. Geomech. 17 (6): 04016142. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000845.
Terzaghi, K. 1943. Theoretical soil mechanics. New York: Wiley.
Toth, P. S., H. T. Chan, and C. B. Cragg. 1988. “Coal ash as structural fill, with special reference to ontario experience.” Can. Geotech. J. 25 (4): 694–704. https://doi.org/10.1139/t88-080.
Trivedi, A., and V. K. Sud. 2005. “Ultimate bearing capacity of footings on coal ash.” Granular Matter 7 (4): 203–212. https://doi.org/10.1007/s10035-005-0203-4.
USACE. 1992. Engineering and design: Bearing capacity of soils. Engineering Manual EM 1110-1-1905. Washington, DC: USACE.
Vahedifard, F., and J. D. Robinson. 2016. “Unified method for estimating the ultimate bearing capacity of shallow foundations in variably saturated soils under steady flow.” J. Geotech. Geoenviron. Eng. 142 (4): 04015095. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001445.
Vanapalli, S. K., and F. M. O. Mohamed. 2007. “Bearing capacity of model footings in unsaturated soils.” In Experimental unsaturated soil mechanics, edited by T. Schanz, 483–493. Berlin: Springer.
van Genuchten, M. T. 1980. “A closed-form equation predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J. 44 (5): 892–898. https://doi.org/10.2136/sssaj1980.03615995004400050002x.
Vo, T., and A. R. Russell. 2016. “Bearing capacity of strip footings on unsaturated soils by the slip line theory.” Comput. Geotech. 74: 122–131. https://doi.org/10.1016/j.compgeo.2015.12.016.
Wang, D., M. Tawk, B. Indraratna, A. Heitor, and C. Rujikiatkamjorn. 2019a. “A mixture of coal wash and fly ash as a pavement substructure material.” Transp. Geotech. 21: 100265. https://doi.org/10.1016/j.trgeo.2019.100265.
Wang, L., D. Sun, B. Chen, and J. Li. 2019b. “Three-dimensional seismic stability of unsaturated soil slopes using a semi-analytical method.” Comput. Geotech. 110: 296–307. https://doi.org/10.1016/j.compgeo.2019.02.008.
Zhai, Q., and H. Rahardjo. 2013. “Quantification of uncertainties in soil-water characteristic curve associated with fitting parameters.” Eng. Geol. 163: 144–152. https://doi.org/10.1016/j.enggeo.2013.05.014.
Zhang, C., B. Gao, Q. Yan, J. Zhao, and L. Wu. 2019. “Development of allowable bearing capacity for strip foundations in unsaturated soil.” Comput. Geotech. 114: 103138. https://doi.org/10.1016/j.compgeo.2019.103138.
Zhou, C., J. H. Yin, and J. P. Ming. 2002. “Bearing capacity and settlement of weak fly ash ground improved using lime-fly ash or stone columns.” Can. Geotech. J. 39 (3): 585–596. https://doi.org/10.1139/t02-011.
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Journal of Hazardous, Toxic, and Radioactive Waste
Volume 24 • Issue 4 • October 2020
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© 2020 American Society of Civil Engineers.
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Received: Feb 8, 2020
Accepted: May 1, 2020
Published online: Jul 8, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 8, 2020
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