Experimental investigation of skin friction response of RC piles in hard limestone rocks
- PDF / 2,252,180 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 2 Downloads / 191 Views
ORIGINAL PAPER
Experimental investigation of skin friction response of RC piles in hard limestone rocks Abdulhafiz O. Alshenawy 1 & Wagdi M. Hamid 1 & Ahmed M. Alnuaim 1 Received: 7 December 2018 / Accepted: 18 July 2019 # Saudi Society for Geosciences 2019
Abstract The pile foundations are widely applied in Riyadh, Kingdom of Saudi Arabia, during the last two decades for many projects such as Riyadh metro, multi-story buildings, bridges, tunnels, and other structures. The pile foundation system is used in Riyadh city not because of the weakness of the limestone rock layers but because of space and time limitations, economic issues, and difficulty of transferring the utilities. The pile foundation transfers the superstructure load to the rock layers by means of skin friction and end bearing resistance. In this paper, four pile load experiments were performed to describe practically the process of transferring the load via skin friction on reinforced concrete piles with different lengths and diameters constructed on large samples of limestone rock. A soft material (Styrofoam) was put underneath the pile to remove the effect of resistance due to end bearing. The test results of the ultimate skin friction were predicted using some of the methods available in the literature. For some of the available methods, a close proximity was observed between the test results and the predicted values. Keywords Limestone rock . Pile . Skin friction . Pile load experiment
Introduction Constructing a pile in limestone rock strata as a foundation system is usually utilized in Riyadh city, Saudi Arabia, for Riyadh metro, bridges, multi-story buildings, and other structures. Bored cast-in-situ concrete piles have the advantages of increasing the load-carrying capacity by socketing the pile into a rock. However, the mechanism of transferring a load of a socketed or embedded pile in rock is still in the development stage and depends on the substrata condition and the type of rock, modulus of rock, strength, and unfavorable condition of rock (IS 14593 1998). The load-carrying capacity of a pile founded on a rock depends on the load-carrying capacity of the pile itself and the load-carrying capacity of the underlying rock. In geotechnical engineering, the connection between rock properties (such as the UCS) and the ultimate skin friction was Editorial handling: Zeynal Abiddin Erguler * Abdulhafiz O. Alshenawy [email protected] 1
Department of Civil Engineering, King Saud University, Riyadh 11421, Saudi Arabia
studied. The loads of the structures are safely transferred to the rocks through axially loaded piles in one of the three ways: (1) by only skin friction, (2) by only end bearing, and (3) by combination of the first two that is by the summation of skin friction and end bearing (CGS 1985). The first option (only skin friction resistance) is utilized where the end bearing resistance cannot be initiated due to the presence of cavities or uncleaned bottom of the drilled hole. The second option is preferred in those places where low s
Data Loading...
