International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 12 | Dec 2024
p-ISSN: 2395-0072
www.irjet.net
Defects in Bored cast-in-situ Piles and their Remediation – A case study from India By Farid Akhtar Khan, India --------------------------------------------------------------------------***---------------------------------------------------------------------------Abstract This paper presents an in-depth case study on the defective construction of a pile foundation and its remedial measures. Typically, projects do not anticipate defects severe enough to impact the project timeline, nor do they allocate time for defect analysis, design rectification, preparation of drawings and repairing. In such a scenario, it becomes essential to adopt expedited processes for defect analysis and solution for remedial works. This paper provides critical insights in to identifying and remediating defects in bored cast-in-situ pile construction at a project site in Uttarakhand, India.
Keywords Pile foundation, Bored Cast-in-situ, Low strain test, High strain test, Static test, Piled raft
Introduction Case study is for the defects encountered during the construction of pile foundation for the main plant RCC building, which measures 31m x 37 m in size and is of 35 m in height with multiple levels of equipment-supporting floors. A piled raft was conceptualized and designed with a group of 340 piles. Due to lose silty soil at the bearing level, the raft’s contribution to the foundation capacity was not considered. Each pile was 600 mm in diameter and 18 m in length. Poor construction supervision and inappropriate construction methods were practiced at site and that led to the complex situation where everything was uncertain about the integrity of piles and pile capacity. The client reviewed the field inspection report closely and raised concerns about whether the constructed foundation achieved the intended design strength. The client directed the project team to perform a thorough quality check of piles, certify their adequacy and provide design and drawings for corrective measures. This case study comprehensively details the entire process encompassing defect analysis, the formulation of mitigation designs and the execution of remedial measures.
Scope of Study 1.
Review and analysis of the constructed pile foundation to identify the quality issues
2.
Review of the existing geotechnical investigation report to assess soil conditions and their implications on the pile foundation
3.
A Cost and time-optimized sequential approach for defects analysis using low-strain integrity testing, and evaluate capacity through high strain dynamic testing.
4.
Reassess and redesign the piled raft foundation, incorporating proposed modifications to the original design to achieve the design strength.
5.
Recommend suitable corrective measures for implementation to restore the foundation for the intended design loads.
6.
Conclusions and lessons learnt.
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