Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31324
Cantilever Shoring Piles with Prestressing Strands: An Experimental Approach

Authors: Hani Mekdash, Lina Jaber, Yehia Temsah

Abstract:

Underground space is becoming a necessity nowadays, especially in highly congested urban areas. Retaining underground excavations using shoring systems is essential in order to protect adjoining structures from potential damage or collapse. Reinforced Concrete Piles (RCP) supported by multiple rows of tie-back anchors are commonly used type of shoring systems in deep excavations. However, executing anchors can sometimes be challenging because they might illegally trespass neighboring properties or get obstructed by infrastructure and other underground facilities. A technique is proposed in this paper, and it involves the addition of eccentric high-strength steel strands to the RCP section through ducts without providing the pile with lateral supports. The strands are then vertically stressed externally on the pile cap using a hydraulic jack, creating a compressive strengthening force in the concrete section. An experimental study about the behavior of the shoring wall by pre-stressed piles is presented during the execution of an open excavation in an urban area (Beirut city) followed by numerical analysis using finite element software. Based on the experimental results, this technique is proven to be cost-effective and provides flexible and sustainable construction of shoring works.

Keywords: Excavation, shoring system, inclinometer, prestressing

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 0

References:


[1] B. B. Broms, “Design and Construction of Anchored and Strutted Sheet Pile Walls in Soft Clay,” 1988, p. 37.
[2] C. Huang, W. Ren, and L. Kong, “New Mathematical Modelling of Stabilizing Pile with Prestressed Tieback Anchors,” Mathematical Problems in Engineering, vol. 2013, pp. 1–12, 2013, doi: 10.1155/2013/601508.
[3] W. Gong, H. Huang, C. H. Juang, and L. Wang, “Simplified-robust geotechnical design of soldier pile–anchor tieback shoring system for deep excavation,” Marine Georesources & Geotechnology, vol. 35, no. 2, pp. 157–169, Feb. 2017, doi: 10.1080/1064119X.2015.1120369.
[4] Peck, R. B. (1969). Deep Excavations and Tunneling in Soft Ground. State-of-the-Art-Report,7th ICSMFE, Mexico City, State-of-the-Art Volume, 225-290.
[5] NAVFAC (1982). Design Manual DM-7, Department of Navy, Washington, D.C.
[6] M. Long, “Database for Retaining Wall and Ground Movements due to Deep Excavations,” J. Geotech. Geoenviron. Eng., vol. 127, no. 3, pp. 203–224, Mar. 2001, doi: 10.1061/(ASCE)1090-0241(2001)127:3(203).
[7] M. Long, C. Brangan, C. Menkiti, M. Looby, and P. Casey, “Retaining walls in Dublin Boulder Clay, Ireland,” Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, vol. 165, no. 4, pp. 247–266, Aug. 2012, doi: 10.1680/geng.9.00091.
[8] M. I. Ramadan, E. H. Ramadan, and M. M. Khashila, “Cantilever Contiguous Pile Wall for Supporting Excavation in Clay,” Geotech Geol Eng, vol. 36, no. 3, pp. 1545–1558, Jun. 2018, doi: 10.1007/s10706-017-0407-5.
[9] W. A. Marr and M. Hawkes, “Displacement-Based Design for Deep Excavations,” in Earth Retention Conference 3, Bellevue, Washington, United States, Jul. 2010, pp. 82–100, doi: 10.1061/41128(384)6.