Study on effect of encasing on pull-out response of granular anchor pile foundation
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ORIGINAL PAPER
Study on effect of encasing on pull-out response of granular anchor pile foundation Heena Malhotra 1
&
Sanjay Kumar Singh 1
Received: 8 July 2019 / Accepted: 28 May 2020 # Saudi Society for Geosciences 2020
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. Keywords Encased granular anchor pile foundation (EGAPF) . Pull-out Load . Cohesive soil . Sandy soil . Geotextile . Geonet
Introduction In civil engineering, the most important component of the buildings and structures is its foundation. All the loads from superstructure are supported by the foundation system. So, designing the foundation system properly lead to a safe, efficient, and economic project overall. There are many land and offshore structures such as television and transmission towers, marine structures such as floating platforms, bridge abutments, retaining walls, tall chimneys, tension cable for suspension bridges, bulkheads, avalanche control structures (snow nets, umbrella system), tall buildings, etc., whose foundations are subjected to large uplift forces (Bhardwaj and Responsible editor: Zeynal Abiddin Erguler * Heena Malhotra [email protected] Sanjay Kumar Singh [email protected] 1
Punjab Engineering College (Deemed to be University), Chandigarh 160012, India
Singh 2015). The conventional shallow foundation in cohesive and sandy soil may not be sufficient to withstand the large uplift forces; therefore, such cases required deep foundations such as concrete pile, under-reamed pile foundations, belled pier foundations, etc. Granular piles (GP) were developed initially to resist compressive loads through predominantly pile action (Sharma et al. 2004). Granular piles, known as stone columns, have been extensively used in soft
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