Experimental Investigation on Efficiency Factor of Pile Groups Regarding Distance of Piles
There are a lot of the parameters which affect pile group behavior in soil. One of these factors is the distance of piles from each other. The impact of distance on pile groups in sand has been investigated through some researches, whereas most of them have not represented an exact estimation according to the continuous change of the distance in sand. Moreover, most of previous investigations have considered two piles as a perfect group. Since two-pile group has the least interaction effect among piles, it cannot suitably demonstrate the influence of spacing. In this lecture, several 4-pile groups modeled with different spacing were subjected to axial loading in laboratory. The pile groups were free-head with length to diameter ratio of 13.5. The piles are designed in a way which the shaft resistance of piles can be completely mobilized through the test. Then, the bearing capacities of pile groups are measured and compared with the single pile's resistance in order to calculate the efficiency coefficient of the groups. It is revealed that the distance is noticeably effective in efficiency factor and this effectiveness, non-linearly decreases by increase of spacing. The results show that the efficiency coefficient is changing between almost 1 and 1.4.
Rotta Loria, Alessandro F., and Lyesse Laloui. “The Interaction Factor Method for Energy Pile Groups.” Computers and Geotechnics 80 (December 2016): 121–137. doi:10.1016/j.compgeo.2016.07.002.
Rezaei, Maryam, Amir Hamidi, and Abtin Farshi Homayoun Rooz. "Investigation of peak particle velocity variations during impact pile driving process." Civil Engineering Infrastructures Journal 49, no. 1 (2016): 59-69. doi:10.7508/ceij.2016.01.005.
Vesić, A. S. “Experiments with Instrumented Pile Groups in Sand.” Performance of Deep Foundations (1969): 177–177–46. doi:10.1520/stp47286s.
Poulos, Harry George, and Edward Hughesdon Davis. Pile foundation analysis and design. No. Monograph. 1980.
Robinsky, E I, and C F Morrison. “Sand Displacement and Compaction around Model Friction Piles.” Canadian Geotechnical Journal 1, no. 2 (March 1964): 81–93. doi:10.1139/t64-002.
Ismael, Nabil F. "Axial load tests on bored piles and pile groups in cemented sands." Journal of geotechnical and geoenvironmental engineering 127, no. 9 (2001): 766-773.doi:10.1061/(ASCE)1090-0241(2001)127:9(766).
Basile, F. “Analysis and Design of Pile Groups.” Numerical Analysis and Modelling in Geomechanics (2003): 278–315. doi:10.4324/9780203471289_chapter_10.
Le Kouby, Alain, Jean Claude Dupla, Jean Canou, and Roméo Francis. “The Effects of Installation Order on the Response of a Pile Group in Silica Sand.” Soils and Foundations 56, no. 2 (April 2016): 174–188. doi:10.1016/j.sandf.2016.02.002.
Modarresi, Mehdi, Habib Rasouli, Abbasali Taghavi Ghalesari, and Mohammad Hassan Baziar. “Experimental and Numerical Study of Pile-to-Pile Interaction Factor in Sandy Soil.” Procedia Engineering 161 (2016): 1030–1036. doi:10.1016/j.proeng.2016.08.844.
Bowles, L. E. Foundation analysis and design. McGraw-hill, 1996.
Kraft Jr, Leland M. "Performance of axially loaded pipe piles in sand." Journal of Geotechnical Engineering 117, no. 2 (1991): 272-296. doi:10.1061/(ASCE)0733-9410(1991)117:2(272).
Foray, P. "Scale and boundary effects on calibration chamber pile tests." In Proceedings of the First International Symposium on Calibration Chamber Testing/ISOCCTl, Potsdam, New York, pp. 147-160. 1991.
Tamura, Shuji, Yasuhito Higuchi, Yasuhiro Hayashi, and Masahiro Yamzasaki. “Centrifuge Studies on the Effects of Existing Piles on the End Resistance and Shaft Friction of a Newpile.” Soils and Foundations 52, no. 6 (December 2012): 1062–1072. doi:10.1016/j.sandf.2012.11.021.
Tehrani, F. S., F. Han, R. Salgado, M. Prezzi, R. D. Tovar, and A. G. Castro. “Effect of Surface Roughness on the Shaft Resistance of Non-Displacement Piles Embedded in Sand.” Géotechnique 66, no. 5 (May 2016): 386–400. doi:10.1680/jgeot.15.p.007.
Salgado, Rodrigo, Fei Han, and Monica Prezzi. “Analysis of the Axial Response of Non-Displacement Piles in Sand.” Geomechanics II (August 28, 2006). doi:10.1061/40870(216)28.
Zhang, Qian-qing, Shan-wei Liu, Shi-min Zhang, Jian Zhang, and Kang Wang. “Simplified Non-Linear Approaches for Response of a Single Pile and Pile Groups Considering Progressive Deformation of Pile–soil System.” Soils and Foundations 56, no. 3 (June 2016): 473–484. doi:10.1016/j.sandf.2016.04.013.
Lee, Su-Hyung, and Choong-Ki Chung. “An Experimental Study of the Interaction of Vertically Loaded Pile Groups in Sand.” Canadian Geotechnical Journal 42, no. 5 (October 2005): 1485–1493. doi:10.1139/t05-068.
Al-Mhaidib, Abdullah I. “Experimental Investigation of the Behavior of Pile Groups in Sand under Different Loading Rates.” Geotechnical and Geological Engineering 24, no. 4 (August 2006): 889–902. doi:10.1007/s10706-005-7466-8.
Sales, Mauricio Martines, Monica Prezzi, Rodrigo Salgado, Yoon Seok Choi, and Jintae Lee. “Load-Settlement Behaviour of Model Pile Groups in Sand under Vertical Load.” Journal of Civil Engineering and Management 23, no. 8 (November 20, 2017): 1148–1163. doi:10.3846/13923730.2017.1396559.
Phuong, N.T.V., A.F. van Tol, A.S.K. Elkadi, and A. Rohe. “Numerical Investigation of Pile Installation Effects in Sand Using Material Point Method.” Computers and Geotechnics 73 (March 2016): 58–71. doi:10.1016/j.compgeo.2015.11.012.
Le Kouby, Alain, Jean Claude Dupla, Jean Canou, and Roméo Francis. "Pile response in sand: experimental development and study." International Journal of Physical Modelling in Geotechnics 13, no. 4 (2013): 122-137.
Han, Fei, Rodrigo Salgado, Monica Prezzi, and Jeehee Lim. “Shaft and Base Resistance of Non-Displacement Piles in Sand.” Computers and Geotechnics 83 (March 2017): 184–197. doi:10.1016/j.compgeo.2016.11.006.
Das, Braja M. “Principles of Foundation Engineering.” 6th Edition. Thomson, (2007).
- There are currently no refbacks.
Copyright (c) 2019 mojtaba pashayan
This work is licensed under a Creative Commons Attribution 4.0 International License.