Effect of CSL Tube Type on the Drilled Shaft Axial Load Carrying Capacity

International Journal of Civil Engineering
© 2014 by SSRG - IJCE Journal
Volume 1 Issue 3
Year of Publication : 2014
Authors : Mohammad Bahman Naraghi Sefat, Shahin Nayyeri, Asad Esmaeily
How to Cite?

Mohammad Bahman Naraghi Sefat, Shahin Nayyeri, Asad Esmaeily, "Effect of CSL Tube Type on the Drilled Shaft Axial Load Carrying Capacity," SSRG International Journal of Civil Engineering, vol. 1,  no. 3, pp. 14-19, 2014. Crossref, https://doi.org/10.14445/23488352/IJCE-V1I3P103


Cross-Hole Sonic Logging (CSL) is a common type of Non Destructive Testing (NDT) method, which is currently used to check the integrity of placed drilled shafts. CSL evaluates the integrity of the concrete inside the cage and between the access tubes based on propagation of ultrasonic waves between two or more access tubes. A number of access tubes are installed inside the reinforcing cage prior to concrete placement as guides for sensors. The access tubes can be PVC or steel galvanized based on ASTM6760 [5]. The type of the CSL tubes can affect the axial strength of the drilled shaft. The objective of this study is to compare the amount of axial load capacity of drilled shafts due to using different type of CSL tubes inside the caging. To achieve this, three (3) large-scale drilled shaft samples were built and tested using a hydraulic actuator at the Florida International University’s (FIU) Titan America Structures and Construction Testing (TASCT) laboratory. During the static load test, loaddisplacement curves were recorded by the data acquisition system (MegaDAC). Three (3) drilled shaft samples were built to evaluate the effect of the type of the CSL tube on the axial load capacity in drilled shaft foundations.


- Drilled Shaft Foundations, Axial Load Capacity, PVC, Galvanized Tube, and CSL Tube


[1] M O’Neill, SW Tabsh, H Sarhan, Response of drilled shafts with minor flaws to axial and lateral loads. Engineering Structures, Vol 25, Issue 1, 2003, pp 47-56.
[2] H Sarhan, and MW O’Neill, Aspects of structural design of drilled shafts for flexure. Int. Deep Foundations Congress: Geotechnical special publ. No. 116, M. W. O’Neill and F. C. Townsend, eds., ASCE, Reston, Va., 2002, 1151–1165.
[3] M Hajali, and C Abi Shdid, Behavior of Axially Loaded Drilled Shaft Foundations with Symmetric Voids outside and
inside the Caging. Deep Foundation Institute Journal, 6(2), 2012, 25-34.
[4] M Hajali, and C Abi Shdid, Cross-hole Sonic Logging and Frequency Tomography Analysis of Drilled Shaft Foundations to Better Evaluate Anomalies Locations The Journal of Deep Foundation Institute, vol 8, 2014, pp. 27-38.
[5] M Hajali, and C Abi Shdid, “Three-dimensional Finite Element Nonlinear Static Analysis of a Drilled Shaft Subjected to Axial Load”. Proceedings of the 11th ASCE Joint Specialty Conference on Probabilistic Mechanics and Structural Reliability, 2012, pp 10.
[6] W Tabsh, M W O’Neill, Effects of Minor Anomalies on Axial Capacity of Drilled Shafts. Transportation Research Board, Paper No. 01-0176, 2002, pp. 65-72