Study on effect of encasing on pull-out response of granular anchor pile foundation

Abstract

A foundation is subjected to varied forces, namely, compressive and tensile. Buildings and structures founded on shallow foundation often face serious problems with uneven settlements and overall stability in case of large lateral or uplift loads. The stability factor entitled to pull-out force is still unexplored through various horizons of research. The recent technique witnessed to achieve the proficiency in the application of granular anchor pile foundation (GAPF) that uses to withstand both the forces, i.e., compressive as well as tensile forces. The paper provides test results regarding the effect of encasing the GAPF with geosynthetic (geotextile and geonet), i.e., encased granular anchor pile foundation (EGAPF) in view of improving its performance further. Pull-out load tests were conducted on GAPF by varying different parameters specifically length of pile, length to depth (L/D) ratio, group piles, spacing of group piles, and encasing of pile with geosynthetic (geotextile and geonet) material for clayey and sandy soil. The effect of encasing of geomaterials in EGAPF (encased GAPF) increases the pull-out capacity for clayey soil, whereas it decreases in case of sandy soil in comparison with GAPF for all L/D ratio. Further, pull-out capacity for GAPF increases with geotextile encased as compared with geonet for the clayey soil.