ABSTRACT: The increasing demand for deep foundations in problematic soils and restricted construction sites has led to the widespread use of micro-piles. Under-reamed micro-piles provide enhanced uplift resistance and loadcarrying capacity through enlarged base sections. This study investigates the load transfer mechanism and uplift resistance behavior of under-reamed micro-piles using Bi-Directional Static Load Testing (O-Cell). The O-Cell testing method provides separate measurements of shaft resistance and end-bearing capacity without the need for external reaction systems. Results indicate that under-reamed sections significantly improve uplift resistance and optimize load transfer efficiency. The study contributes to the understanding of pile-soil interaction and provides recommendations for the design of under-reamed micro-piles in geotechnical engineering applications.

KEYWORDS: Under-Reamed Micro-Piles, O-Cell Testing, Uplift Resistance, Load Transfer, Deep Foundations, Geotechnical Engineering.

LOAD TRANSFER AND UPLIFT RESISTANCE ANALYSIS OF UNDER-REAMED MICRO-PILES USING BIDIRECTIONAL STATIC LOAD TESTING (O-CELL)

K. VENKATA NAGA LAXMA NAIK
PROF. CH. SUDHARANI