Bearing Capacity and Settlement of Footings in Unsaturated Sand

Vanapalli, Sai K.

doi:10.21660/2013.9.3k

Cited by 19 publications

(16 citation statements)

References 26 publications

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“…However, the effect of dilation is negligible at higher confining stress (i.e., (s 3 2u a )5200 kPa). These results are consistent with the observations of other investigators in the literature (Zhan, 2003;Vanapalli and Mohamed, 2013).…”

Section: Comparison Between the Experimental And Predicted Values Of supporting

confidence: 94%

“…More widely, it is used in the calculation of the soil stresses and deformation behavior (Davis and Poulos, 1968;Schmertmann, 1970;Schmertmann et al, 1978;Bowles, 1987;Lade and Nelson, 1987;Lade, 1988;Berardi and Lancellotta, 1991;Lancelotta, 1995;Terzaghi et al, 1996;Mayne and Poulos, 1999;Lee et al, 2008;Akbas and Kulhawy, 2009;Oh et al, 2009;Vanapalli and Mohamed, 2013). Terzaghi's (1925Terzaghi's ( , 1926Terzaghi's ( , 1931 pioneering modeling and experimental studies showed that the swelling and shrinkage characteristics of clay are essentially elastic deformations caused by the clay's affinity for water.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of the modulus of elasticity of compacted unsaturated expansive soils

Adem

Vanapalli

2014

International Journal of Geotechnical Engineering

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A semi-empirical model was proposed by Vanapalli and Oh (2010) for predicting the variation of the modulus of elasticity with respect to matric suction for soils with plasticity index I p values lower than 16%. This model has been extended in this paper to predict the modulus of elasticity of unsaturated expansive soils. The information required for using the model include the soil-water characteristic curve (SWCC) and the modulus of elasticity of soil under saturated condition along with two fitting parameters. Experimental data of triaxial tests for three different expansive soils from the literature were used to examine the validity of the model. The results of the study suggest that the model can reasonably predict the modulus of elasticity of unsaturated expansive soils. The study results are encouraging in reliably using the modulus of elasticity based method proposed by Adem and Vanapalli (2013) for estimation of the volume change behavior of expansive soils.

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Section: Comparison Between the Experimental And Predicted Values Of supporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Prediction of the modulus of elasticity of compacted unsaturated expansive soils

Adem

Vanapalli

2014

International Journal of Geotechnical Engineering

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“…Also, results of CPTs conducted by Vanapoli & Fathi [10] in a specially designed tank showed that cone resistance and bearing capacity of sand can be influenced by suction. Russell and Khalili [11] also showed that the cone penetration resistance is comparable to the required pressure for expansion of a spherical cavity in an infinite sand, and it could be increased due to presence of suction in an unsaturated condition.…”

Section: Introductionmentioning

confidence: 98%

Simple Numerical Model to Simulate Penetration Testing in Unsaturated Soils

Jarast

Ghayoomi

2016

E3S Web Conf.

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Abstract. Cone penetration test in unsaturated sand is modelled numerically using Finite Element Method. Simple elastic-perfectly plastic Mohr-Coulomb constitutive model is modified with an apparent cohesion to incorporate the effect of suction on cone resistance. The Arbitrary Lagrangian-Eulerian (ALE) remeshing algorithm is also implemented to avoid mesh distortion problem due to the large deformation in the soil around the cone tip. The simulated models indicate that the cone resistance was increased consistently under higher suction or lower degree of saturation. Sensitivity analysis investigating the effect of input soil parameters on the cone tip resistance shows that unsaturated soil condition can be adequately modelled by incorporating the apparent cohesion concept. However, updating the soil stiffness by including a suction-dependent effective stress formula in Mohr-Coulomb material model does not influence the cone resistance significantly.

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“…Footings with short open-and close-end stumps were experimented by Chan [14] for settlement reduction in soft clay soils as an economical solution to excessive and non-uniform subsidence problems in waterlogged, low-lying areas. Also, Vanapalli& Mohamed [15] and AlKhuzaei [16] the former in a geogrid-reinforced sand bed. No observation was made of the effect of the geogrid base on the overall performance of the footings though.…”

Section: Introductionmentioning

confidence: 99%

Footing With Inverted Pyramidal Protrusions for Settlement Control in Sandy Deposits

Chan¹

2017

GEOMATE

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This paper examines the feasibility of using an innovative footing with a corrugated base to enhance the load-bearing capacity of shallow foundation, and to reduce the substructure's subsidence as a whole or differentially. The corrugated base consists of inverted pyramidal protrusions which give a 3-fold advantages: (1) the pointed tips help smoothen the process of installation on site, (2) the protrusions provide additional contact surface between the foundation and the soil for better load-bearing, (3) the corrugated base entraps soil between the individual protrusions, improving the foundation's stability against settlement and sliding. Scaled models of the 8 cm x 8 cm footing were produced using 3D printing: CONTROL-smooth base, Design A corrugated base with16 inverted pyramidal protrusions of 2 cm x 2 cm x 2 cm each, and Design Bcorrugated base with 64 inverted pyramidal protrusions of 1 cm x 1 cm x 1 cm each. Both designs had the same contact surface area with the soil, though the penetration depth of the pyramids and the space between the protrusions varied. Maintained load tests were carried out in simulated soil beds to determine the improved performance of the foundation. It was shown that the corrugated slabs reduced settlement up to over 85 % compared with the conventional smooth-base footing, with Design B giving slightly better results. It was also observed that the larger pyramidal protrusions (Design A) tended to entrap air between them, forming air cushions which resisted further penetration of the corrugated base into the soil, i.e. inhibiting mobilization of the maximum load-bearing capacity.

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Bearing Capacity and Settlement of Footings in Unsaturated Sand

Cited by 19 publications

References 26 publications

Prediction of the modulus of elasticity of compacted unsaturated expansive soils

Prediction of the modulus of elasticity of compacted unsaturated expansive soils

Simple Numerical Model to Simulate Penetration Testing in Unsaturated Soils

Footing With Inverted Pyramidal Protrusions for Settlement Control in Sandy Deposits

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