Effect of Reinforcement on Bearing Capacity of Loose Sand Foundation and Deformation Behavior of Buried Flexible Pipes

2010 ◽  
Vol 38 (2) ◽  
pp. 101627 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Myoung Soo Won
Keyword(s):  
Bearing Capacity ◽  
Deformation Behavior ◽  
Loose Sand ◽  
Flexible Pipes

Bearing Capacity of Foundations with Inclusion of Dense Sand Layer over Loose Sand Strata

2017 ◽  
Vol 17 (10) ◽  
pp. 06017018 ◽  
Author(s):  
Vishwas N. Khatri ◽  
Jyant Kumar ◽  
Shamim Akhtar
Keyword(s):  
Bearing Capacity ◽  
Loose Sand ◽  
Sand Layer ◽  
Dense Sand

Volume Displacement Effects on Pile Capacity in Loose Sand

1973 ◽  
Vol 10 (4) ◽  
pp. 645-647
Author(s):  
Eli I. Robinsky ◽  
Christopher B. H. Cragg
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Loose Sand ◽  
Soil Pressure ◽  
Pile Capacity ◽  
University Of Toronto ◽  
Testing Facility ◽  
Large Scale Testing ◽  
The University ◽  
Displacement Effects

Preliminary tests in the new large-scale testing facility at the University of Toronto reveal that bearing capacity on a pile volume basis is more efficiently developed by a long slender pile or a group of short slender piles than by a pile of larger diameter. The authors attribute this to increased arching in the soil around the pile of greater volume displacement, believing arching buffers the pile from the effects of lateral soil pressure.

The Effect of Shallow-Water Waves on the Stability and Bearing Capacity of Sea Beds

1974 ◽  
Vol 14 (04) ◽  
pp. 330-336
Author(s):  
R. Fernandez Luque ◽  
R. van Beek
Keyword(s):  
Bearing Capacity ◽  
Water Waves ◽  
Pressure Fluctuations ◽  
Wave Action ◽  
Shallow Foundations ◽  
Loose Sand ◽  
Dense Sand ◽  
Model Experiments ◽  
Sea Bottom ◽  
Clay Deposits

Abstract This paper reports a theoretical and experimental investigation of the influence of shallow water waves on the bearing capacity of foundations in sea beds. The propagation of pressure waves through a porous sea bed is calculated, assuming plane elastic-plastic soil deformation under undrained loading conditions, and including the effect of dilatancy. The effective stresses thus generated are compared with the soil-stability limits. The consequences for both sand and clay deposits are considered individually. Model experiments in a flume demonstrate how prolonged wave action increases the density of an initially very loose sand, whereas it expands an initially dense sand. Because small changes in void ratio have a significant effect on the bearing capacity of a sediment, the bearing capacity of a loose sand bed increases with prolonged wave action, but that of a dense sand decreases. It was found, however, that under all circumstances the ultimate bearing capacity of a sandy sea bottom is largely sufficient for pile-foundation purposes. In fact, stormy weather tends to stabilize the bearing capacity of a sandy sea bottom. In contrast, calculations for clay deposits show that the excess pore pressure caused by wave action on a normally consolidated clay cannot be dissipated within a practical time limit. Waves are thus unable to compact a clay deposit. The shearing forces generated by shallow waves in an underconsolidated clay may therefore cause soil instability during a severe storm. Our calculations and model experiments seem to indicate that shallow foundations subject to strong wave action will settle gradually within a plastic region of the sea bottom as a result of cyclic wave loading. This paper describes a practical method for calculating a safe depth of burial and bearing capacity for shallow foundations subject to wave action. INTRODUCTION Ocean waves are able to generate significant shearing forces in sea-floor sediments up to total (water + soil) depths of approximately half the length of the waves. Waves could thus affect the end bearing capacity of shallow foundations or the lateral resistance at shallow depths of deep foundation piles. We shall first calculate the pressure fluctuations at the sea bottom due to plane irregular waves using the small-amplitude wave theory. We shall then calculate the stresses and pore pressures generated in the sea bottom by such irregular pressure fluctuations at the bed surface, assuming plane elastic - plastic soil deformation and introducing a pore - pressure parameter for the saturated soil under undrained, biaxial loading condition s. We shall compare those stresses with the soil stability limits and consider soil consolidation due to wave action. Then we shall present the results of model experiments performed in a laboratory flume, showing that prolonged wave action increases the density of an initially very loose sand, whereas it expands an initially dense sand. We shall compare theory and experiment. Finally, we shall discuss a method for calculating a safe depth of burial and bearing capacity for shallow foundations subject to wave action.

scholarly journals Numerical Study of Strip Footings Behavior on Compacted Sand

2019 ◽  
pp. 1-10
Author(s):  
Nasser A. A. Radwan ◽  
Khaled M. M. Bahloul
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Layer Thickness ◽  
Numerical Study ◽  
Computer Software ◽  
Strip Footing ◽  
Loose Sand ◽  
Strip Footings

The aim of this research is to investigate numerically the effect of using compacted sand as soil replacement layer beneath a strip footing on its bearing capacity. Finite element computer software Plaxis 2D version 8.6 was used to predict the behavior of strip footing resting on loose sand and on compacted sand. Study was conducted for footing widths of 1 up to 2 meters and various depths ranging from 1m up to 2m, also the effect of replacement layer thickness was investigated. It was found that using replacement layer beneath strip footing increases its bearing capacity for different widths and depths of footing. This improvement is observed up to thickness of replacement layer equal to 3 times the footing width (H/B=3), where further increase in replacement layer thickness does not affect significantly bearing capacity of footings.

scholarly journals Pressure Settlement Behaviour and Bearing Capacity of Asymmetric Embedded Plus Shaped Footing on Layered Sand

2021 ◽  
Vol 31 (3) ◽  
pp. 152-176
Author(s):  
Priyanka Rawat ◽  
Rakesh Kumar Dutta
Keyword(s):  
Bearing Capacity ◽  
Numerical Study ◽  
Friction Angle ◽  
Thickness Ratio ◽  
Embedment Depth ◽  
Loose Sand ◽  
Dense Sand ◽  
Comparison Of The Results ◽  
Abaqus Software ◽  
Settlement Behaviour

Abstract The aim of the present numerical study was to analyse the pressure settlement behaviour and bearing capacity of asymmetric plus shaped footing resting on loose sand overlying dense sand at varying embedment depth. The numerical investigation was carried out using ABAQUS software. The effect of depth of embedment, friction angle of upper loose and lower dense sand layer and thickness of upper loose sand on the bearing capacity of the asymmetric plus shaped footing was studied in this investigation. Further, the comparison of the results of the bearing capacity was made between the asymmetric and symmetric plus shaped footing. The results reveal that with increase in depth of embedment, the dimensionless bearing capacity of the footings increased. The highest increase in the dimensionless bearing capacity was observed at embedment ratio of 1.5. The increase in the bearing capacity was 12.62 and 11.40 times with respect to the surface footings F1 and F2 corresponding to a thickness ratio of 1.5. The lowest increase in the dimensionless bearing capacity was observed at embedment ratio of 0.1 and the corresponding increase in the bearing capacity was 1.05 and 1.02 times with respect to the surface footing for footings F1 and F2 at a thickness ratio of 1.5.

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