Causes of Failure and Strengthening Measures of a Pile Foundation Supporting Transmission Line Tower
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VIEW THE REPLYPublication: Journal of Performance of Constructed Facilities
Volume 35, Issue 4
Abstract
The present paper describes the failure of an under-reamed pile foundation supporting a transmission line tower. Assessment of in-service pile conditions, i.e., in-built length, depth of bulb, uniformity of cross-sectional area, and length of the pile, are estimated through low strain integrity test. Integrity test results reveal that improper bulb formation and shorter as-built length than the designed are the leading causes of failure. Different performance criteria (uplift, compressive, and lateral capacities) of the in-service pile foundation are estimated through extensive finite element analysis and conventional approaches. Different geometric characteristics, i.e., straight shaft, different diameter of the bulb, and pile length, are simulated to represent the in-service pile conditions in the field. The estimated performance criteria are compared with the initial design values to evaluate the required degree of strengthening measures. The paper presents the initial design criteria of pile, soil condition, low strain integrity test, finite element modeling, and strengthening measures of the pile foundation to ensure the long-term stability of the transmission tower.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors are thankful to the Director of CSIR–CBRI for providing the environment, encouragement, support, and facilities for the completion of this study. The authors are also thankful to Punjab State Transmission Cooperation Limited (PSTCL, Punjab) for sponsoring the project and providing all the necessary supports during the course of the study. The authors are also thankful to the different staff of CSIR–CBRI for their kind help during the study.
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Received: Oct 29, 2020
Accepted: Jan 25, 2021
Published online: May 27, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 27, 2021
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