Performance Assessment of Screw Piles Embedded in Soft Clay
Abstract
Screw piles are widely used in a variety engineering applications supplying stability against compression, overturning moment, uplift tension, and horizontal loads. Screw pile is a famous solution for support light structures, roads and rail signs which have relatively low-capacity foundation. In this study, the behavior of circular (10) mm solid screw pile models embedded in a bed of soft clay soil covering a layer of sandy soil has been studied. The 200 mm thick sand layer was compacted in a steel container with a diameter of 300 mm into four sublayers. The sandy soil layer was compacted at a relative density of 70%. The 300 mm thick soft clay soil bed with Cu (30) kPa was compacted in six sub-layers on the sandy bottom layer. Model tests are carried out with screw piles with a length of 300 mm, 350 mm and 400 mm and a helix diameter of 30 mm. Also, single and double helix and different S/Dh ratio were used for these piles and a comparative study between screw piles and ordinary piles (without helices) is accomplished. This study revealed that introducing screw pile of double helix increases its bearing capacity in soft clay soil by up to a (4-8) % as compared to a single helix screw pile. The results showed that the behavior of screw pile essentially depends on the geometric properties of the pile. According to the achievements, compressive load capacity of screw piles depends on embedded length, spacing ratio (S/Dh) and number of helical plates.
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References
Brand, E. W. and Brenner, R. P., “Soft Clay Engineering.” Developments in Geotechnical Engineering (1981). doi:10.1016/c2009-0-14508-7.
British Standard B.S: C.P. 8004, “Code of Practice for Foundations”, British Standard Institution, London, British, (1986). doi:10.3403/00159525.
Firoozi, Ali Akbar, C. Guney Olgun, Ali Asghar Firoozi, and Mojtaba Shojaei Baghini. “Fundamentals of Soil Stabilization.” International Journal of Geo-Engineering 8, no. 1 (December 2017). doi:10.1186/s40703-017-0064-9.
Ascalew, A., and G. N. Ian Smith. "Pile Foundation Design: A Student Guide." School of the Built Environment, Napier University, Edinburgh. Balkema/Rotterdam/Boston (2007): 83-102.
Basu, Prasenjit, and Monica Prezzi. “Design and Applications of Drilled Displacement (Screw) Piles”, Publication FHWA/IN/JTRP-2009/28., Joint Transportation Research Program, Indiana Department of Transportation and Purdue University, West Lafayette, Indiana. (1969). doi:10.5703/1288284314278.
Fahmy, Ahmed, and M. Hesham El Naggar. “Axial Performance of Helical Tapered Piles in Sand.” Geotechnical and Geological Engineering 35, no. 4 (February 22, 2017): 1549–1576. doi:10.1007/s10706-017-0192-1.
Likhitha.H1, Raghavendra.H.N2, Rakesh.K.P3 and Uday Shrihari.P. “The Compression Bearing Capacity of Helical Piles in Black Cotton Soil.” International Journal of Innovative Research in Science, Engineering and Technology Vol. 6, Issue 7, (July 2017).
Hassan Obaid Abbase. Pullout Capacity of Screw Piles in Sandy Soil. Journal of Geotechnical Engineering. 2017; 4(1): 8–12p.
Albusoda, Bushra S., and Hassan O. Abbase. “Performance Assessment of Single and Group of Helical Piles Embedded in Expansive Soil.” International Journal of Geo-Engineering 8, no. 1 (December 2017). doi:10.1186/s40703-017-0063-x.
Wang, Tengfei, Jiankun Liu, Bowen Tai, Chuanzhen Zang, and Zhichun Zhang. “Frost Jacking Characteristics of Screw Piles in Seasonally Frozen Regions Based on Thermo-Mechanical Simulations.” Computers and Geotechnics 91 (November 2017): 27–38. doi:10.1016/j.compgeo.2017.06.018.
Hargrave, R. L., and R. E. Thorsten. "Helical piers in expansive soils of Dallas, Texas." In Proceedings of the 7th International Conference on Expansive Soils, Dallas, Tex, pp. 3-5. 1992.
Geotechnics, Arup. "Design of screw piles: assessment of pile design methodology." Ove Arup & Partners Ltd, London (2005).
Livneh, Ben, and M. Hesham El Naggar. “Axial Testing and Numerical Modeling of Square Shaft Helical Piles under Compressive and Tensile Loading.” Canadian Geotechnical Journal 45, no. 8 (August 2008): 1142–1155. doi:10.1139/t08-044.
Khazaei, Javad, and Abolfazl Eslami. “Geotechnical Behavior of Helical Piles via Physical Modeling by Frustum Confining Vessel (FCV).” International Journal of Geography and Geology 5, no. 9 (2016): 167–181. doi:10.18488/journal.10/2016.5.9/10.9.167.181.
Al-Baghdadi, Therar A., Michael J. Brown, Jonathan A. Knappett, and Asad H. Al-Defae. “Effects of Vertical Loading on Lateral Screw Pile Performance.” Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 170, no. 3 (June 2017): 259–272. doi:10.1680/jgeen.16.00114.
Hamed, Majid, Hanifi Canakci, and Omar Khaleel. “Performance of Multi-Helix Pile Embedded in Organic Soil under Pull-Out Load.” Transportation Infrastructure Geotechnology 6, no. 1 (January 9, 2019): 56–66. doi:10.1007/s40515-018-00069-0.
Mohajerani, Abbas, Dusan Bosnjak, and Damon Bromwich. “Analysis and Design Methods of Screw Piles: A Review.” Soils and Foundations 56, no. 1 (February 2016): 115–128. doi:10.1016/j.sandf.2016.01.009.
Al-Baghdadi, TA, C Davidson, MJ Brown, JA Knappett, A Brennan, C Augarde, W Coombs, L Wang, D Richards, and A Blake. “CPT-Based Design Procedure for Installation Torque Prediction for Screw Piles Installed in Sand.” Offshore Site Investigation Geotechnics 8th International Conference Proceedings (n.d.): 346–353. (2018) doi:10.3723/osig17.346.
British Standards Institution, BSI, BS 8004, (2015), Code of Practice for Foundations, Milton Keynes, London, British.
Sakr, Mohammed. “Installation and Performance Characteristics of High Capacity Helical Piles in Cohesionless Soils.” DFI Journal - The Journal of the Deep Foundations Institute 5, no. 1 (June 2011): 39–57. doi:10.1179/dfi.2011.004.
Zhang, D. J. Y., R. Chalaturnyk, P. K. Robertson, D. C. Sego, and G. Cyre. "Screw Anchor Test Program (Part I): Instrumentation, Site Characterization and Installation." In Proc. 51st Canadian Geotech. Conf., Edmonton. 1998.
Abdel-Rahim, Hamdy HA, Yehia Kamal Taha, and Walla El din El sharif Mohamed. "The compression and uplift bearing capacities of helical piles in cohesionless soil." Journal of Engineering Sciences 41, no. 6 (2013): 2055-2064.
DOI: 10.28991/cej-2019-03091371
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