On vertical bearing capacity of ring footings: finite element analysis, observations and recommendations
26 Nov 2021-International Journal of Geotechnical Engineering (Informa UK Limited)-Vol. 15, Iss: 10, pp 1207-1219
TL;DR: In this paper, the authors defined a radius ratio (ri/ro) which is the ratio of the inner radius (ri) to outer radius (ro) of the ring footing.
Abstract: Ring footing is defined by a radius ratio (ri/ro) which is the ratio of the inner radius (ri) to outer radius (ro) of the ring footing. The behaviour of ring footings (ri/ro = 0 to 1) lies in-betwe...
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TL;DR: In this paper , the bearing capacity of a ring foundation resting on anisotropic and heterogenous clays is investigated using finite element analysis (FEA) and multivariate adaptive regression splines (MARS).
Abstract: Abstract Axisymmetric solutions for the bearing capacity of ring foundation resting on anisotropic and heterogenous clays are presented in this paper using finite element analysis (FEA). The NGI-ADP model in PLAXIS FEA, a widely used anisotropic soil model, is adopted to study the stability responses of ring foundations, with special consideration given to the effects of increasing undrained shear strength with the depth. Numerical results are formulated in terms of a dimensionless stability number (bearing capacity ratio) that is a function of three dimensionless input parameters: namely, the ratio of inner and outer radius, the increasing strength gradient ratio, and the anisotropic shear strength ratio. The influence of each dimensionless input parameter on the bearing capacity ratio is investigated using design charts and failure mechanisms, and they are scored by relative importance indexes in multivariate adaptive regression splines (MARS) model—a machine learning approach. A highly accurate equation generated from the MARS model is proposed as an effective tool for engineering practitioners.
22 citations
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TL;DR: In this paper, the undrained bearing capacity of embedded footings and the depth factors associated with it were investigated and the results showed that shallow foundations are seldom rested on the ground surface and are often embedded below the surface.
Abstract: Shallow foundations are seldom rested on the ground surface and are often embedded below the surface. The undrained bearing capacity of embedded footings and the depth factors associated with it fo...
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TL;DR: The authors summarizes the results of recent research on the bearing capacity of spread foundations of various shapes under a central vertical load and outlines the effects of found bearing capacity on the performance of the spread foundations.
Abstract: The first part of the paper summarizes the results of recent research on the bearing capacity of spread foundations of various shapes under a central vertical load and outlines the effects of found...
773 citations
"On vertical bearing capacity of rin..." refers background or methods or result in this paper
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TL;DR: In this paper, an extensive series of tests on small footings resting on fine sand was performed at Ghent to determine the values of the shape factors to be introduced in the formula of ultimate bearing capacity of shallow foundations.
Abstract: Synopsis In order to determine the values of the shape factors to be introduced in the formula of ultimate bearing capacity of shallow foundations, an extensive series of tests on small footings resting on fine sand was performed at Ghent. To obtain a homogeneous and given density the sand was placed in a fully automatic way, under control of the output and the height of fall of the sand. To eliminate the depth effect the overburden pressure was realized by air pressure in inflated rubber bags covering the surface of the sand. From the tests formulae for the shape factors sq, sc and sγ are deduced. It appears that the shape factor sγ in the weight term is independent of the angle of friction, while the shape factors sq and sc are not. In the formulae given for s and sc the influence of the state of strain is implicitly included; however, different formulae are given depending on whether the effect of the curvature of the intrinsic curve on the introduced shear strength parameters has been considered or no...
239 citations
"On vertical bearing capacity of rin..." refers background or result in this paper
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TL;DR: In this paper, finite elements in conjunction with elasto-plastic theory can give excellent collapse load predictions for footings resting on c-φ soils, and the problem is approached by consider...
Abstract: The Paper shows how finite elements, in conjunction with elasto-plastic theory, can give excellent collapse load predictions for footings resting on c-φ soils. The problem is approached by consider...
187 citations
"On vertical bearing capacity of rin..." refers background or methods or result in this paper
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TL;DR: In this article, the bearing capacity of circular and ring footings on reinforced sand was investigated by conducting laboratory model tests along with numerical analysis, and the effects of the depth of the first layer of reinforcement, vertical spacing and number of reinforcement layers on bearing capacity were investigated.
Abstract: A study was performed to investigate the bearing capacity of circular and ring footings on reinforced sand by conducting laboratory model tests along with numerical analysis. The effects of the depth of the first layer of reinforcement, vertical spacing and number of reinforcement layers on bearing capacity of the footings were investigated. Both the experimental and numerical studies indicated that, when a single layer of reinforcement is used there is an optimum reinforcement embedment depth for which the bearing capacity is greatest. There also appeared to be an optimum vertical spacing of reinforcing layers for multi-layer reinforced sand. The bearing capacity was also found to increase with increasing number of reinforcement layers, if the reinforcements were placed within a range of effective depths. In addition, the analysis indicated that increasing reinforcement stiffness beyond a threshold value does not result in a further increase in the bearing capacity.
136 citations
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