The Experts below are selected from a list of 1023 Experts worldwide ranked by ideXlab platform
Xueliang Zhao - One of the best experts on this subject based on the ideXlab platform.
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Characteristic Test Study on Bearing Capacity of Suction Caisson Foundation Under Vertical Load
China Ocean Engineering, 2020Co-Authors: Guoliang Dai, Zhu Wenbo, Qian Zhai, Weiming Gong, Xueliang ZhaoAbstract:Suction Caisson foundations are often subjected to vertical uplift loads, but there are still no wide and spread engineering specifications on design and calculation method for uplift bearing capacity of Suction Caisson foundation. So it is important to establish an uplift failure criterion. In order to study the uplift bearing mechanism and failure mode of Suction Caisson foundation, a series of model tests were carried out considering the effects of aspect ratio, soil permeability and loading mode. Test results indicate that the residual negative pressure at the top of Caisson is beneficial to enhance uplift bearing capacity. The smaller the permeability coefficient is, the higher the residual negative pressure will be. And the residual negative pressure is approximately equal to the water head that causes seepage in the Caisson. When the load reaches the ultimate bearing capacity, both the top and bottom negative pressures are smaller than Su and both the top and bottom reverse bearing capacity factors are smaller than 1.0 in soft clay. Combined the uplift bearing characteristics of Caisson in sandy soil and soft clay, the bearing capacity composition and the calculation method are proposed. It can provide a reference for the engineering design of Suction Caisson foundation under vertical load.
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Upper Bound Solutions for Uplift Ultimate Bearing Capacity of Suction Caisson Foundation
China Ocean Engineering, 2019Co-Authors: Guoliang Dai, Zhu Wenbo, Qian Zhai, Weiming Gong, Xueliang ZhaoAbstract:Suction Caisson foundation derives most of their uplift resistance from passive Suction developed during the pullout movement. It was observed that the passive Suction generated in soil at the bottom of the Caisson and the failure mode of Suction Caisson foundation subjecting pullout loading behaves as a reverse compression failure mechanism. The upper bound theorems have been proved to be a powerful method to find the critical failure mechanism and critical load associated with foundations, buried Caissons and other geotechnical structures. However, limited attempts have been reported to estimate the uplift bearing capacity of the Suction Caisson foundation using the upper bound solution. In this paper, both reverse failure mechanisms from Prandtl and Hill were adopted as the failure mechanisms for the computation of the uplift bearing capacity of the Suction Caisson. New equations were proposed based on both failure mechanisms to estimate the pullout capacity of the Suction Caisson. The proposed equations were verified by the test results and experimental data from published literature. And the two solutions agree reasonably well with the other test results. It can be proved that both failure mechanisms are reasonably and more consistent with the actual force condition.
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upper bound solution for ultimate bearing capacity of Suction Caisson foundation based on hill failure mode
2018Co-Authors: Wenbo Zhu, Guoliang Dai, Weiming Gong, Xueliang ZhaoAbstract:In order to study the upper bound solution of bearing capacity of Suction Caisson foundations under vertical uplift loads, we introduce the viewpoint of reverse bearing capacity and the Hill failure mode for study. Select the appropriate foundation failure mode and displacement velocity field, it means that the active area of Hill failure mode becomes the passive area under the vertical pullout loads and the logarithmic spiral direction is opposite. At the same time, the factors of soil weight, cohesion, friction coefficient and earth pressure in the upper-bound theorem are put into consideration, and reasonable upper bound theorem is derived for Hill failure mode. The upper bound solutions is calculated by using the Matlab program and compared with the previous experimental data and other upper bound solution, it is proved that the failure mode of the soil and this method are reasonable.
Qiu Yue - One of the best experts on this subject based on the ideXlab platform.
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Research on the Uplift Failure Criterion of Suction Caisson Foundation
Science Technology and Engineering, 2013Co-Authors: Qiu YueAbstract:To obtain the uplift failure criterion of Suction Caisson foundation,the model tests on inclined loading capacity of Suction Caisson are conducted by using models with L/D ratio of 4.The effect of loading angle is considered.The result shows that the load-displacement curves can be divided into two displacement segments,the gradual segment and the mutant segment,which have obvious inflection points in between when the loading angle is small.The damage displacement of Suction Caisson is obtained by proposing a formula based on the displacement corresponding to the inflection points.While the loading angle equals to 90 degree,the displacement changes little before Suction Caisson is pulled out.Therefore,displacement can not be used to decide if Suction Caisson foundation is damaged.It is suggested that load should be controlled to prevent the foundation from damaging.
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Review on the Uplift Failure Criterion of Suction Caisson Foundation
China offshore Platform, 2013Co-Authors: Zheng Xiang, Li Bing, Qiu YueAbstract:Suction Caisson foundation,a new foundation type used for offshore floating structure,is more widely used in marine engineering and its bearing behavior is also one of the current research focus due to a variety of advantages,such as convenient transportation and construction,saving time,reusability and low cost.So far,there are no widely recognized uplift failure criterions and studies specifically about the uplift failure criterions of Suction Caisson foundation.Therefore,it is very necessary to discuss the uplift failure criterions of Suction Caisson foundation.The existing uplift failure criterions are reviewed and analyzed based on load point location and loading direction.Finally,the existing problems and research direction of the uplift failure criterion of Suction Caisson foundation are pointed out as well.
Guoliang Dai - One of the best experts on this subject based on the ideXlab platform.
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Characteristic Test Study on Bearing Capacity of Suction Caisson Foundation Under Vertical Load
China Ocean Engineering, 2020Co-Authors: Guoliang Dai, Zhu Wenbo, Qian Zhai, Weiming Gong, Xueliang ZhaoAbstract:Suction Caisson foundations are often subjected to vertical uplift loads, but there are still no wide and spread engineering specifications on design and calculation method for uplift bearing capacity of Suction Caisson foundation. So it is important to establish an uplift failure criterion. In order to study the uplift bearing mechanism and failure mode of Suction Caisson foundation, a series of model tests were carried out considering the effects of aspect ratio, soil permeability and loading mode. Test results indicate that the residual negative pressure at the top of Caisson is beneficial to enhance uplift bearing capacity. The smaller the permeability coefficient is, the higher the residual negative pressure will be. And the residual negative pressure is approximately equal to the water head that causes seepage in the Caisson. When the load reaches the ultimate bearing capacity, both the top and bottom negative pressures are smaller than Su and both the top and bottom reverse bearing capacity factors are smaller than 1.0 in soft clay. Combined the uplift bearing characteristics of Caisson in sandy soil and soft clay, the bearing capacity composition and the calculation method are proposed. It can provide a reference for the engineering design of Suction Caisson foundation under vertical load.
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Upper Bound Solutions for Uplift Ultimate Bearing Capacity of Suction Caisson Foundation
China Ocean Engineering, 2019Co-Authors: Guoliang Dai, Zhu Wenbo, Qian Zhai, Weiming Gong, Xueliang ZhaoAbstract:Suction Caisson foundation derives most of their uplift resistance from passive Suction developed during the pullout movement. It was observed that the passive Suction generated in soil at the bottom of the Caisson and the failure mode of Suction Caisson foundation subjecting pullout loading behaves as a reverse compression failure mechanism. The upper bound theorems have been proved to be a powerful method to find the critical failure mechanism and critical load associated with foundations, buried Caissons and other geotechnical structures. However, limited attempts have been reported to estimate the uplift bearing capacity of the Suction Caisson foundation using the upper bound solution. In this paper, both reverse failure mechanisms from Prandtl and Hill were adopted as the failure mechanisms for the computation of the uplift bearing capacity of the Suction Caisson. New equations were proposed based on both failure mechanisms to estimate the pullout capacity of the Suction Caisson. The proposed equations were verified by the test results and experimental data from published literature. And the two solutions agree reasonably well with the other test results. It can be proved that both failure mechanisms are reasonably and more consistent with the actual force condition.
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upper bound solution for ultimate bearing capacity of Suction Caisson foundation based on hill failure mode
2018Co-Authors: Wenbo Zhu, Guoliang Dai, Weiming Gong, Xueliang ZhaoAbstract:In order to study the upper bound solution of bearing capacity of Suction Caisson foundations under vertical uplift loads, we introduce the viewpoint of reverse bearing capacity and the Hill failure mode for study. Select the appropriate foundation failure mode and displacement velocity field, it means that the active area of Hill failure mode becomes the passive area under the vertical pullout loads and the logarithmic spiral direction is opposite. At the same time, the factors of soil weight, cohesion, friction coefficient and earth pressure in the upper-bound theorem are put into consideration, and reasonable upper bound theorem is derived for Hill failure mode. The upper bound solutions is calculated by using the Matlab program and compared with the previous experimental data and other upper bound solution, it is proved that the failure mode of the soil and this method are reasonable.
Weiming Gong - One of the best experts on this subject based on the ideXlab platform.
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Characteristic Test Study on Bearing Capacity of Suction Caisson Foundation Under Vertical Load
China Ocean Engineering, 2020Co-Authors: Guoliang Dai, Zhu Wenbo, Qian Zhai, Weiming Gong, Xueliang ZhaoAbstract:Suction Caisson foundations are often subjected to vertical uplift loads, but there are still no wide and spread engineering specifications on design and calculation method for uplift bearing capacity of Suction Caisson foundation. So it is important to establish an uplift failure criterion. In order to study the uplift bearing mechanism and failure mode of Suction Caisson foundation, a series of model tests were carried out considering the effects of aspect ratio, soil permeability and loading mode. Test results indicate that the residual negative pressure at the top of Caisson is beneficial to enhance uplift bearing capacity. The smaller the permeability coefficient is, the higher the residual negative pressure will be. And the residual negative pressure is approximately equal to the water head that causes seepage in the Caisson. When the load reaches the ultimate bearing capacity, both the top and bottom negative pressures are smaller than Su and both the top and bottom reverse bearing capacity factors are smaller than 1.0 in soft clay. Combined the uplift bearing characteristics of Caisson in sandy soil and soft clay, the bearing capacity composition and the calculation method are proposed. It can provide a reference for the engineering design of Suction Caisson foundation under vertical load.
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Upper Bound Solutions for Uplift Ultimate Bearing Capacity of Suction Caisson Foundation
China Ocean Engineering, 2019Co-Authors: Guoliang Dai, Zhu Wenbo, Qian Zhai, Weiming Gong, Xueliang ZhaoAbstract:Suction Caisson foundation derives most of their uplift resistance from passive Suction developed during the pullout movement. It was observed that the passive Suction generated in soil at the bottom of the Caisson and the failure mode of Suction Caisson foundation subjecting pullout loading behaves as a reverse compression failure mechanism. The upper bound theorems have been proved to be a powerful method to find the critical failure mechanism and critical load associated with foundations, buried Caissons and other geotechnical structures. However, limited attempts have been reported to estimate the uplift bearing capacity of the Suction Caisson foundation using the upper bound solution. In this paper, both reverse failure mechanisms from Prandtl and Hill were adopted as the failure mechanisms for the computation of the uplift bearing capacity of the Suction Caisson. New equations were proposed based on both failure mechanisms to estimate the pullout capacity of the Suction Caisson. The proposed equations were verified by the test results and experimental data from published literature. And the two solutions agree reasonably well with the other test results. It can be proved that both failure mechanisms are reasonably and more consistent with the actual force condition.
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upper bound solution for ultimate bearing capacity of Suction Caisson foundation based on hill failure mode
2018Co-Authors: Wenbo Zhu, Guoliang Dai, Weiming Gong, Xueliang ZhaoAbstract:In order to study the upper bound solution of bearing capacity of Suction Caisson foundations under vertical uplift loads, we introduce the viewpoint of reverse bearing capacity and the Hill failure mode for study. Select the appropriate foundation failure mode and displacement velocity field, it means that the active area of Hill failure mode becomes the passive area under the vertical pullout loads and the logarithmic spiral direction is opposite. At the same time, the factors of soil weight, cohesion, friction coefficient and earth pressure in the upper-bound theorem are put into consideration, and reasonable upper bound theorem is derived for Hill failure mode. The upper bound solutions is calculated by using the Matlab program and compared with the previous experimental data and other upper bound solution, it is proved that the failure mode of the soil and this method are reasonable.
Charlier Robert - One of the best experts on this subject based on the ideXlab platform.
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Axisymmetric transient modelling of a Suction Caisson in sand: a numerical study
'Informa UK Limited', 2016Co-Authors: Cerfontaine Benjamin, Collin Frédéric, Charlier RobertAbstract:peer reviewedaudience: professionalThis paper deals with the axisymmetric behaviour of a Suction Caisson installed in sand upon vertical monotonic and cyclic loading. A steel Caisson is numerically modelled using the finite element code LAGAMINE. The Prevost model reproduces the cyclic behaviour of the soil, i.e. it captures the accumulation of deformation and pore water pressure within the soil. Coupled interface finite elements allow the modelling of the uplift behaviour of the Caisson in both drained and partially drained conditions. Upon compression or traction loading, the Suction Caisson presents different modes of resistance: friction along the shaft, bearing capacity under the lid or the tip of the Caisson, Suction effect. The first part of this work describes the progressive mobilisation of these modes of resistance during monotonic simulations. The partially drained effect is particularly interesting since it drastically increases the resistance to transient loading. It proceeds from the transient consolidation process induced by the Caissons loading. The second part describes the evolution of the settlement of the Suction Caisson upon different kind of cyclic loading signals
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Axisymmetric transient modelling of a Suction Caisson in sand: a numerical study
2016Co-Authors: Cerfontaine Benjamin, Collin Frédéric, Charlier RobertAbstract:This paper deals with the axisymmetric behaviour of a Suction Caisson installed in sand upon vertical monotonic and cyclic loading. A steel Caisson is numerically modelled using the finite element code LAGAMINE. The Prevost model reproduces the cyclic behaviour of the soil, i.e. it captures the accumulation of deformation and pore water pressure within the soil. Coupled interface finite elements allow the modelling of the uplift behaviour of the Caisson in both drained and partially drained conditions. Upon compression or traction loading, the Suction Caisson presents different modes of resistance: friction along the shaft, bearing capacity under the lid or the tip of the Caisson, Suction effect. The first part of this work describes the progressive mobilisation of these modes of resistance during monotonic simulations. The partially drained effect is particularly interesting since it drastically increases the resistance to transient loading. It proceeds from the transient consolidation process induced by the Caissons loading. The second part describes the evolution of the settlement of the Suction Caisson upon different kind of cyclic loading signals.Peer reviewe
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Vertical transient loading of a Suction Caisson in dense sand
2015Co-Authors: Cerfontaine Benjamin, Collin Frédéric, Charlier RobertAbstract:Suction Caissons are hollow cylinders open towards the bottom currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation for offshore wind turbines in shallow water (Senders 2009). The Prevost model for cohesionless soils (Prevost 1985) is adapted for the modelling of their cyclic behaviour. It is able to reproduce plastic deformation in both loading and unloading, contractancy of the soil and pore pressure build up as well. In this paper, a fully-coupled transient axisymmetric analysis of a Suction Caisson is carried out. The monotonic partially drained behaviour of the Caisson is firstly highlighted. Afterwards, pseudo-random and sinusoidal-equivalent storm signals are compared. Permanent displacements accumulated at the end of the storm show a good agreement between them but are slightly divergent, which indicates that the position of the extreme event might be a relevant issue.Peer reviewe
