Statistical-Numerical Analysis for Pullout Tests of Ground Anchors

Juraj Chalmovský, Jan Štefaňák, Lumír Miča, Zdenek Kala, Šarūnas Skuodis, Arnoldas Norkus, Daiva Žilionienė

Abstract


The paper presents an application of statistical and numerical methods for the determination of the force-displacement curves and that of pullout capacity of prestressed grouted ground anchors installed in Miocene clay. A regression analysis of data from a database of acceptance test records for ground anchors to create has been performed, the force-displacement curve of the tested anchor corresponding to the range of loads applied for acceptance tests has been created. A linear regression model, employing the weighted least squares method and robust standard errors techniques were concluded to serve as a reliable statistical method suitable for achieving this goal. The discovered linear regression dependence then served as a lower control limit for the displacement values calculated at the anchor head applying the numerical model. A finite element model has been created to predict the behaviour of ground anchors being installed in fine-grained soils. The developed numerical model that employs Mohr-Coulomb strength criterion constitutive model evaluates the influence of high-pressure grouting by development additional radial stresses and that of an increment of fixed length diameter.

Keywords:
Finite Element Method (FEM); ground anchor displacement; high-pressure grouting; numerical analysis; statistical analysis.

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References


Anderson, T. W.; Darling, D. A. 1952. Asymptotic Theory of Certain ”Goodness-of-Fit” Criteria Based on Stochastic Process- es, Annals of Mathematical Statistics 23(2): 193−212. https://doi.org/10.1214/aoms/1177729437

Anderson, T. W.; Darling, D. A. 1954. A Test of Goodness-of-Fit, Journal of the American Statistical Association 49(268): 765−769. https://doi.org/10.1080/01621459.1954.10501232

Desai, C.; Muqtadir, A.; Scheele, F. 1986. Interaction Analysis of Anchor‐Soil Systems, Journal of Geotechnical Engineering 112(5): 537–553. https://doi.org/10.1061/(ASCE)0733-9410(1986)112:5(537)

Domes, X. A. 2015. Cement Grouting during Installation of Ground Anchors in Non-Cohesive Soils. PhD thesis. Trondheim, Norwegian University of Science and Technology.

Duzceer, R.; Mothersille, D.; Okumusoglu, B.; Gokalp, A. 2015. Support of 25 m Deep Excavation Using Ground Anchors in Russia, in Proc. of the ICE − Geotechnical Engineering. 168(4): 281−295. https://doi.org/10.1680/geng.14.00043

Ene, A.; Marcu, D.; Popa, H. 2014. Testing of Ground Anchorages for a Deep Excavation Retaining System in Bucharest, in Proc. XV Danube − European Conference on Geotechnical Engineering (DECGE 2014), 9−11 September 2014, Vienna, Austria, Paper No. 176. 6 p.

Ghosh, P.; Kumar, R. 2015. Numerical Study on Static Interaction of Closely Spaced Horizontal Square or Rectangular Ground Anchors in c-ϕ Soil, International Journal of Geosynthetics and Ground Engineering 1(4):1−7. https://doi.org/10.1007/s40891-015-0037-z

Hegazy, Y. A. 2002. Reliability of Estimated Anchor Pullout Resistance, Grouting and Ground Treatment. Reston, VA: American Society of Civil Engineers, 772−779.

Hu, W. C.; Hsu, S. T. 2012. Numerical Modeling of Earth Structures: Frictional Anchors in Sand, Advanced Materials Research (486): 214–220. https://doi.org/10.4028/www.scientific.net/AMR.486.214

Jacquar Fondasol, F. C. 2014. Foundations by Prestressing Anchors of the “Villa Méditerranée” in Marseille from Design to Monitoring, in Proc. of the ISSMGE Technical Committee 207 International Conference on Geotechnical Engineering − Soil-Structure Interaction, Underground Structures and Retaining Walls, 16−18 June 2014, St Petersburg, Russia. 127−131. http://doi.org/10.3233/978-1-61499-464-0-127

Jones, D. A.; Turner, M. J. 1980. Load Tests on Post-Grouted Micropiles in London Clay, Ground Engineering 13(6): 47–53.

Kim, N. K.; Park, J. S.; Kim S. K. 2007. Numerical Simulation of Ground Anchors, Computers and Geotechnics 34(6): 498–507. https://doi.org/10.1016/j.compgeo.2006.09.002

Kummerer, C. 2003. Numerical Modelling of Displacement Grouting and Application to Case Histories. PhD thesis. Gratz, Technische Universität Graz.

Littlejohn, G. S. 1980. Design Estimation of the Ultimate Load-Holding Capacity of Ground Anchors, Ground Engineering 13(8): 25–39.

Lee, S. W.; Kim, T. S.; Sim, B. K.; Kim, J. S.; Lee, I. M. 2012. Effect of Pressurized Grouting on Pullout Resistance and Group Efficiency of Compression Ground Anchor, Canadian Geotechnical Journal 49(8): 939−953. https://doi.org/10.1139/t2012-059

Meloun, M.; Militký, J. 2011. Statistical Data Analysis: a Practical Guide: Complete with 1250 Exercises and Answer Key on CD. Woodhead Publishing India. 773 p.

Mecsi, J. 1997. Some Practical and Theoretical Aspects of Grouted Soil Anchors, in Proc. of the ICE Conference on Ground Anchors and Anchored Structures, 20–21 March 1997, Lon- don, United Kingdom. 119–130. https://doi.org/10.1680/gaaas.26070.0012

Mišove, P. 1984. Konštrukcia predpätých horninových kotiev a ich únosnosť. Doktorská práce (PhD thesis). Bratislava, TU Bratislava (in Slovak).

Pearson, K. 1900. On the Criterion That a Given System of Deviations from the Probable in the Case of a Correlated System of Variables is Such That It Can be Reasonably Supposed to Have Arisen from Random Sampling, Philosophical Magazine Series 5 50(302): 157−175. https://doi.org/10.1080/14786440009463897

Sciacca, L.; Valmori, F.; Melegari, C.; Maletti, F.; Lenzi, M.; Campana, P.; Padovani, V. 2014. Theoretical and Experimental Investigation on Underwater Ground Anchors, DFI Journal- The Journal of the Deep Foundations Institute 5(1): 15−26. https://doi.org/10.1179/dfi.2011.002

Velič, P.; Mišove, P. 2004. Typové skúšky dočasných horninových kotev. Česká Třebová. Zpráva (Final Report), VUIS Zak- ladanie stavieb. (in Slovak)

Yurekli, K.; Kurunc. A. 2005. Testing the Residuals of an ARIMA Model on the Cekerek Stream Watershed in Turkey, Turkish Journal of Engineering and Environmental Sciences 29(2): 61−74.




DOI: 10.3846/bjrbe.2017.17

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