Engineering Geology

Engineering Geology

Use of Artificial Neural Networks to Estimate Installation Damage of Nonwoven Geotextiles

Authors
Ehsan Amjadi Sardehaei
Gholamhosein Tavakoli Mehrjardi
Abstract
This paper presents a feed-forward back-propagation neural network model to predict the retained tensile strength and design chart to estimate the strength reduction factors of nonwoven geotextiles due to the installation process. A database of 34 full-scale field tests was utilized to train, validate and test the developed neural network and regression model. The results show that the predicted retained tensile strength using the trained neural network is in good agreement with the results of the test. The predictions obtained from the neural network are much better than the regression model as the maximum percentage of error for training data is less than 0.87% and 18.92%, for neural network and regression model, respectively. Based on the developed neural network, a design chart has been established. As a whole, installation damage reduction factors of the geotextile increases in the aftermath of the compaction process under lower as-received grab tensile strength, higher imposed stress over the geotextiles, larger particle size of the backfill, higher relative density of the backfill and weaker subgrades.


Keywords
Artificial neural networks (ANNs)
regression model
Nonwoven geotextiles
Retained tensile strength
strength reduction factor
1. Wang L., Zhang G., Zhang J.M., "Centrifuge model tests of geotextile-reinforced soil embankments during an earthquake", Geotextiles and Geomembranes, Vol. 29 (2011) 222-232.## 2. Tavakoli Mehrjardi G.h., Moghaddas Tafreshi S.N., Dawson A.R., "Pipe response in a geocell reinforced trench and compaction considerations", Geosynthetics International, Vol. 20 (2013) 105-118. ## 3. Portelinha, F.H.M., Zorenberg J.G., Pimental V., "Field performance of retaining walls reinforced with woven and nonwoven geotextiles", Geosynthetics International, Vol. 21 (2014) 270-284. ## 4. Hosseinpou I., Almeida M.S.S., Riccio M., " Full-scale load test and finite-element analysis of soft ground improved by geotextile-encased granular columns". Geosynthetics International, Vol. 22 (2015) 428-438. ## 5. Federal Highway Administration, "Geosynthetic design and construction guidelines", FHWA-HI-95-038 (1998), Washington, USA. ## 6. Greenwood J.H., Brady K.C., "Geotextiles in aggressive soils". Construction and Building Materials, Vol. 6 (1992) 15-18. ## 7. Pinho-Lopes M., Lopes M.L., "Tensile properties of geosynthetics after installation damage", Enviromental Geotechnics, Vol. 1 (2013) 161-178. ## 8. Rosete A., Lopes P.M., Pinho-Lopes M., Lopes M.L., "Tensile and hydraulic properties of geosynthetics after mechanical damage and abration laboratory tests", Geosynthetics International, Vol. 20 (2013) 358-374. ## 9. Carlos D.M., Pinho-Lopes M., Carneiro J.R., Lopes M.L., "Effect of soil grain size distribution on the mechanical damage of nonwoven geotextiles under repeated loading", International Journal of Geosynthetics and Ground Engineering, (2015) 1-9. ## 10. Watn A., Eiksund G., Knutson A., "Deformation and damage of nonwoven geotextiles in road construction", Sixth International Conference on Geosynthetics, (1998) 933-938. ## 11. Moghaddas Tafreshi S.N., Tavakoli Mehrjardi Gh., "The use of neural network to predict the behavior of small plastic pipes embedded in reinforced sand and surface settlement under repeated load", Engineering Applications of Artificial Intelligence, Vol. 21 (2008) 883-894. ## 12. American Association of State Highway and Transportation Officials (AASHTO) "Standard Specification for Geotextile Specification for Highway Applications", AASHTO M288-08 (2008), Virginia, USA. ## 13. American Society for Testing and Materials (ASTM) "Standard Test Method for Measuring Mass per Unit Area of Geotextiles", ASTM D 5261-10 (2010), West Conshohocken, PA, USA. ## 14. American Society for Testing and Materials (ASTM) "Standard Test Method for Grab Breaking Load and Elongation of Geotextiles", ASTM D 4632-15 (2015), West Conshohocken, PA, USA. ## 15. American Society for Testing and Materials (ASTM) "Standard Test Method for Trapezoidal Tearing strength of Geotextiles", ASTM D 4533-15 (2015), West Conshohocken, PA, USA. ## 16. American Society for Testing and Materials (ASTM) "Standard Test Method for Static Puncture Strength of Geotextiles and Geotextile-Related Products Using a 50-mm Probe", ASTM D 6241-14 (2014), West Conshohocken, PA, USA. ## 17. Tavakoli Mehrjardi Gh., Amjadi Sardehaei E., " Design graphs to estimate reduction factor of nonwoven geotextiles due to installation process", European Journal of Environmental and Civil Engineering, Vol. 22 (2017) 1-14. ## 18. MathWorks Inc., "MATLAB the Language of Technical Computing", Version 8, (2015) Natick, MA, USA. ## 19. Hagan M.T., Dermuth H.B., Beale M., "Neural Network Design". PWS Publishing Co (1995), Boston, MA, USA. ## 20. Berg R.R., Christopher B.R., Samtani N.C., "Design of mechanically stabilized earth walls and reinforced soil slopes - Vol. (1)", FHWA NHI-10-024 (2009), Federal Highway Administration, Washington, USA. ## 21. Watts G.R.A., Brady K.C., "Geosynthetics-installation damage and the measurement of tensile strength", Fifth International Conference on Geotextiles, Geomembranes and Related Products, Singapore, (1994) 1159-1164. ## 22. Elvidge C.B., Raymond G.P., "Laboratory survivability of nonwoven geotextiles on open-graded crushed aggregate", Geosynthetics International, Vol. 6 (1999) 93-117. ## 23. Hufenus R., Rüegger R., Flum D., Sterba I.J., "Strength reduction factors due to installation damage of reinforcing geosynthetics". Geotextiles and Geomembranes, Vol. 23 (2005) 401-424. ## 24. Koerner G.R., Koerner R.M., "The installation survivability of geotextiles and geogrids", Fourth International Conference on Geotextiles, Geomembranes and Related Products, Den Haag, (1990) 597-602. ## 25. Tavakoli Mehrjardi Gh., Moghaddas Tafreshi S.N., Dawson A.R., "Combined use of geocell reinforcement and rubber-soil mixtures to improve performance of buried pipes", Journal of Geotextiles and Geomembranes, Vol 34(4) (2012) 116-130. ## 26. Tavakoli Mehrjardi Gh., Ghanbari A., Mehdizadeh H., "Experimental study on the behaviour of geogrid-reinforced slopes with respect to aggregate size", Geotextiles and Geomembranes, Vol. 44 (2016) 862-871. ## 27. Tavakoli Mehrjardi Gh., Khazaei M., " Scale Effect on the Behavior of Geogrid-Reinforced Soil under Repeated Loads", Geotextiles and Geomembranes, Vol. 45(6) (2017) 603-615. ##