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Study on Pull-Out Resistance of Single-Belled Anchor in Layered Sand and Soft Silty-Clay Deposits: Model Tests and Numerical Modelling
The piles that assist to counter any pull-out forces and overturning moments enforced on foundation are idealized as anchor piles. Belled anchors offer passive form of resistance against pull-out forces by the dead-weight and shear resistance of breakout region of foundation media. Experimental investigations are conducted in two different series, for determining pull-out resistance of single-belled anchor models in layered sand and soft silty-clay deposits, having different anchor characteristics and embedment depths. Pull-out resistances are evaluated in layered soil deposits where the thickness of underlying soft soil is constant for all models. The consistency indices are 0.23 and 0.46 in soft soil. Pull-out resistance of belled anchor piles is primarily dependent on the consistency of soft soil and thus on the cohesive strength in undrained condition and secondarily, dependent on overlying sand deposit of different thickness, embedment ratios and diameter ratios. But the effect of bell angle is found to be negligible on pull-out resistance in layered sand and soft soil deposit. All the models are found to be much effective to attain higher pull-out resistance when consistency index is higher in underlying soft soil, as these values are increased by approximately 60–83%. Few numerical analysis for comparatively larger models (scale factor = 1/10) through finite element method in Plaxis 3D Foundation is performed. The reason of variation in pull-out resistance is explored by displacement contour from the Plaxis 3D analysis. So, the Plaxis results are correct and can be used for parametric study.
Study on Pull-Out Resistance of Single-Belled Anchor in Layered Sand and Soft Silty-Clay Deposits: Model Tests and Numerical Modelling
The piles that assist to counter any pull-out forces and overturning moments enforced on foundation are idealized as anchor piles. Belled anchors offer passive form of resistance against pull-out forces by the dead-weight and shear resistance of breakout region of foundation media. Experimental investigations are conducted in two different series, for determining pull-out resistance of single-belled anchor models in layered sand and soft silty-clay deposits, having different anchor characteristics and embedment depths. Pull-out resistances are evaluated in layered soil deposits where the thickness of underlying soft soil is constant for all models. The consistency indices are 0.23 and 0.46 in soft soil. Pull-out resistance of belled anchor piles is primarily dependent on the consistency of soft soil and thus on the cohesive strength in undrained condition and secondarily, dependent on overlying sand deposit of different thickness, embedment ratios and diameter ratios. But the effect of bell angle is found to be negligible on pull-out resistance in layered sand and soft soil deposit. All the models are found to be much effective to attain higher pull-out resistance when consistency index is higher in underlying soft soil, as these values are increased by approximately 60–83%. Few numerical analysis for comparatively larger models (scale factor = 1/10) through finite element method in Plaxis 3D Foundation is performed. The reason of variation in pull-out resistance is explored by displacement contour from the Plaxis 3D analysis. So, the Plaxis results are correct and can be used for parametric study.
Study on Pull-Out Resistance of Single-Belled Anchor in Layered Sand and Soft Silty-Clay Deposits: Model Tests and Numerical Modelling
Lecture Notes in Civil Engineering
Sitharam, T.G. (editor) / Pallepati, Raghuveer Rao (editor) / Kolathayar, Sreevalsa (editor) / Deb, Tanaya (author) / Pal, Sujit Kumar (author)
2021-03-27
17 pages
Article/Chapter (Book)
Electronic Resource
English