An Experimental Study on Bearing Capacity of Steel Open Ended Pipe Pile with Exterior Wings Under Compression Load
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ORIGINAL PAPER
An Experimental Study on Bearing Capacity of Steel Open Ended Pipe Pile with Exterior Wings Under Compression Load Wissam H. Al-Soudani . Bushra S. Albusoda
Received: 3 December 2019 / Accepted: 4 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract The present study investigates the increasing in ultimate pile capacity and studied the soil plugging phenomenon and the incremental filing ratio for a modified type of open-ended pipe pile. The modification performed by adding steel plates as wings with special dimensions and fixed on the exterior face of the pipe pile wall at a location near the pile tip with specified dimensions. Five wings have used for each new model of pipe pile. These wings distributed in equal spacing along with the circumstances of the exterior wall of the open-ended pipe piles. The efficiency of the proposed type studied by modelling and manufacturing twelve piles (40 mm diameter, L/D = 15 and L/D = 20). Complete setup manufactured for installing and loading the piles in a constant rate of penetration. The model piles installed in poorly graded loose dry sand. The obtained results show that the proposed type has a higher ultimate bearing capacity. The percentage of increase reaches more than 50%. The development of the load capacity is due to the three effects. The first is increases of the exterior shaft friction, and the second effect creates a new end-bearing capacity under the constrained soil between the exterior wings. And the third effect is developing the end-bearing capacity under the soil
W. H. Al-Soudani B. S. Albusoda (&) Department of Civil Engineering, University of Baghdad, Baghdad, Iraq e-mail: [email protected]
plug inside open-ended pipe pile due to the first and the second effects. Keywords Open-ended pipe pile Soil plug Loose sand Pile capacity Experimental modeling Compression load
1 Introduction Offshore structures, namely, oil drilling platforms, jetties, tension leg platform, etc. are supported on pile foundations, Basack (2009). Open-ended pipe pile has widely used for the construction of foundations both offshore and land, Shighait (2013). The open-end pipe pile is classified as a low displacement pile and has a low effect on the surrounded soil during installation. During driving the pile into the ground, the soil will try to enter inside the pipe pile and form soil plug. The insertion of the soil inside the pipe pile will continue until the inner soil becomes constrained and sufficient resistance that prevent further soil to enter the pipe pile will generate. If the stresses in the inner soil are sufficient to resist and prevent further soil intrusion inside the pipe pile, the pile will act as a full plugged (closed-end pile). Thus, if the interior shear resistance developed at the bottom region of the soil plug lead to form a passive arching, then the full plugged pipe pile will have high end bearing capacity at the base of the
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