Effect of Compressibility on Undrained Bearing Pressure of Circular Footing Resting on Two-Layered Clay

Shiva Bhushan, Joga Himavarsha

Abstract


The present study aims to investigate the behavior of a circular foundation on layered clay of varying properties. There are several solutions for the bearing capacity of footings on two-layered clays, but none of them considered the compressibility of the strata. An underestimation of the soil bearing capacity is the main cause of failures. The typical difficulty in estimating the capacity of soil is its complicated behavior attributed to the presence of distinct layers of soil. A thick and stiff layer (H) overlies a soft and weak layer, i.e., cu1>cu2 and E1>E2, where 1 and 2 represent the top and bottom layers, respectively. The bearing pressure (q) against settlement responses is evaluated using finite element axisymmetric analysis for varying stiffness ratio (RE =E1/E2), and strength ratio (Rcu = cu1/cu2). A wide range of variations in the bearing pressure factor (Ncf = q/cu1) for circular footings of diameter (D) is observed for different Settlement ratios (SR). It is observed that the Bearing pressure factor increases with an increase in stiffness ratio for a specific settlement and it decreases with an increase in strength ratio.


Keywords


Circular footing, Layered clays, Stiffness, Undrained Strength.

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References


Siva Reddy A, Srinivasan RJ (1971) Bearing Capacity of Footings on Clays. Soils Found 7:51–64. https://doi.org/10.3208/sandf1960.11.3_51

McMahon BT, Haigh SK, Bolton MD (2013) Cavity expansion model for the bearing capacity and settlement of circular shallow foundations on clay. Geotechnique 63: 746–752. https://doi.org/10.1680/geot.12.P.061

Pusadkar, Sunil S. SB (2015) Behaviour of square footing resting on two layered clay deposits.In: Behaviour of square footing resting on two layered clay deposits. pp 01–06

Rao P, Liu Y, Cui J (2015) Bearing capacity of strip footings on two-layered clay under combined loading. Comput Geotech 69: 210–218. https://doi.org/10.1016/j.compgeo.2015.05.018

Benmebarek S, Benmoussa S, Belounar L, Benmebarek N (2012) Bearing Capacity of Shallow Foundation on Two Clay Layers by Numerical Approach. Geotech Geol Eng 30: 907–923. https://doi.org/10.1007/s10706-012-9513-6

Benmoussa S, Benmebarek S, Benmebarek N (2021) Bearing capacity factor of circular footings

on two-layered clay soils. Civ Eng J 7: 775–785. https://doi.org/10.28991/cej-2021-03091689

Merifield RS, Nguyen VQ (2006) Two- and three-dimensional bearing-capacity solutions for footings on two-layered clays. Geomech Geoengin 1: 151–162. https://doi.org/10.1080/17486020600632637

Merifield RS, Sloan SW, Yu HS (1999) Rigorous plasticity solutions for the bearing capacity of two-layered clays. Geotechnique 49: 471–490. https://doi.org/10.1680/geot.1999.49.4.471

Papadopoulou K, Gazetas G (2020) Shape Effects on Bearing Capacity of Footings on Two- Layered Clay. Geotech Geol Eng 38:1347–1370. https://doi.org/10.1007/s10706-019-01095-6

Shiva Bhushan JYV, Madhira M, Narasimha Reddy GV (2023). Effect of Compressibility on Bearing Pressure of Soft Ground. In: Muthukkumaran K, Reddy CNVS, Joseph A, Senthamilkumar S. (eds) Foundation and Forensic Geotechnical Engineering. IGC 2021. Lecture Notes in Civil Engineering, vol 295. Springer, Singapore. https://doi.org/10.1007/978-981-19-6359-9_8




DOI: https://doi.org/10.37591/tmd.v9i3.6951

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