Behaviour of flexible piles in layered sands under eccentric and inclined loads

1994 ◽  
Vol 31 (4) ◽  
pp. 513-520 ◽  
Author(s):  
V.V.R.N. Sastry ◽  
G.G. Meyerhof
Keyword(s):  
Bearing Capacity ◽  
Reasonable Agreement ◽  
Ground Surface ◽  
Embedment Depth ◽  
Loose Sand ◽  
Bending Moments ◽  
Inclined Loads ◽  
Load Tests ◽  
Flexible Model ◽  
Compact Sand

The lateral soil pressures, bending moments, pile displacements at ground surface, and bearing capacity of instrumented vertical single flexible model piles in layered sands consisting of loose sand overlying compact sand under vertical eccentric and central inclined loads have been investigated. The results of these load tests are compared with theoretical estimates based on the concept of an effective embedment depth of equivalent rigid piles. Reasonable agreement has been found between the observed and predicted behaviour of flexible piles. The analyses are also compared with the results of some field case records. Key words : bearing capacity, instrumentation, model test, layered soil, pile, sand.

Behaviour of flexible piles under inclined loads

1990 ◽  
Vol 27 (1) ◽  
pp. 19-28 ◽  
Author(s):  
V. V. R. N. Sastry ◽  
G. G. Meyerhof
Keyword(s):  
Soft Clay ◽  
Ground Surface ◽  
Embedment Depth ◽  
Loose Sand ◽  
Bending Moments ◽  
Soil Pressure ◽  
Inclined Loads ◽  
Load Tests ◽  
Test Pile ◽  
Flexible Model

The lateral soil pressures, bending moments, pile displacements at ground surface, and bearing capacity of instrumented vertical single flexible model piles in homogeneous loose sand and soft clay under central inclined loads have been investigated. The results of these load tests are compared with theoretical estimates based on the concept of an effective embedment depth of equivalent rigid piles. Reasonable agreement has been found between the observed and predicted behaviour of flexible piles. The analyses are also compared with the results of some field case records. Key words: bending moments, clay, displacements, inclined loads, instrumentation, lateral soil pressure, model test, pile, sand.

Behaviour of flexible piles in layered clays under eccentric and inclined loads

1995 ◽  
Vol 32 (3) ◽  
pp. 387-396 ◽  
Author(s):  
V.V.R.N. Sastry ◽  
G.G. Meyerhof
Keyword(s):  
Bearing Capacity ◽  
Soft Clay ◽  
Ground Surface ◽  
Embedment Depth ◽  
Layered Clays ◽  
Inclined Loads ◽  
Clay System ◽  
Load Tests ◽  
Layered Clay ◽  
Test Pile

The lateral soil pressures, bending moments, pile displacements at the ground surface, and the bearing capacity of instrumented vertical single flexible model piles in a layered clay system consisting of medium clay overlying soft clay under vertical eccentric and central inclined loads have been investigated. The results of these load tests are compared with theoretical estimates based on the concept of the effective embedment depth of equivalent rigid piles for ultimate and elastic cases. Reasonable agreement has been found between the observed and predicted behaviour of flexible piles. The analyses are also compared with the results of some field case records. Key words : bearing capacity, clay, instrumentation, model test, pile.

Ultimate capacity of flexible piles under eccentric and inclined loads

1989 ◽  
Vol 26 (1) ◽  
pp. 34-42 ◽  
Author(s):  
G. G. Meyerhof ◽  
D. P. Ghosh
Keyword(s):  
Bearing Capacity ◽  
Soft Clay ◽  
Ultimate Bearing Capacity ◽  
Embedment Depth ◽  
Pile Groups ◽  
Single Model ◽  
Eccentric Load ◽  
Inclined Loads ◽  
Load Tests ◽  
Ultimate Moment

The ultimate bearing capacity of flexible single model piles and small pile groups of timber and nylon in loose sand and soft clay has been determined under various combinations of eccentricity and inclination of the load varying in direction from vertical to horizontal. The results of the load tests are presented in the form of polar bearing capacity diagrams and they are compared with the theoretical estimates based on the concept of an effective embedment depth in terms of the behaviour of equivalent rigid piles. Reasonable agreement has been found between the observed and predicted ultimate bearing capacity of flexible piles under any combination of eccentricity and inclination of loads. Key words: flexible piles, pile groups, ultimate bearing capacity, ultimate moment, model test, eccentric load, inclined load, sand, clay.

Behaviour of flexible batter piles under inclined loads in layered soil

1993 ◽  
Vol 30 (2) ◽  
pp. 247-256 ◽  
Author(s):  
G. G. Meyerhof ◽  
A. S. Yalcin
Keyword(s):  
Bearing Capacity ◽  
Reasonable Agreement ◽  
Influence Factors ◽  
Layered Soil ◽  
Head Model ◽  
Embedment Depth ◽  
Test Results ◽  
Inclined Loads ◽  
Vertical Displacements ◽  
Batter Piles

The behaviour of single free-head model flexible vertical and batter piles under central inclined loads in two-layered soil is investigated. The bearing capacity of the piles is found to depend on the layered structure, load inclination, and pile batter. The theoretical estimates obtained from semiempirical relations agree well with the test results. Previous displacement equations for flexible batter piles in elastic isotropic soil are modified for piles in anisotropic layered soil using an effective embedment depth of equivalent rigid piles. Practical equations for horizontal and vertical displacements of flexible batter piles are presented on the basis of resultant influence factors that are related to the batter angle, load inclination, and distribution of soil modulus with depth. The observed horizontal and vertical displacements of the piles are in reasonable agreement with the theoretical estimates, which are also supported by the results of some field cases. Key words : bearing capacity, deformation, batter pile, inclination factor, inclined load, layered soil, model test, sand, clay.

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.

The bearing capacity of rigid piles and pile groups under inclined loads in clay

1981 ◽  
Vol 18 (2) ◽  
pp. 297-300 ◽  
Author(s):  
G. G. Meyerhof
Keyword(s):  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Test Results ◽  
Pile Groups ◽  
Free Standing ◽  
Previous Theory ◽  
Inclined Loads ◽  
Load Tests ◽  
Batter Piles ◽  
Piled Foundations

The ultimate bearing capacity of rigid vertical and batter piles and pile groups in clay has been determined under various inclinations of the load, varying from the vertical to horizontal directions. The results of load tests on single model piles of different lengths and inclinations and on free-standing groups and piled foundations are compared with theoretical estimates. The influence of load inclination on the bearing capacity can be represented by simple interaction relationships between the axial and normal components of the ultimate load. The effect of eccentricity of the load on the ultimate bearing capacity of pile groups is discussed on the basis of previous theory and model test results.

The Bearing Capacity of Rigid Piles Under Inclined Loads in Sand. I: Vertical Piles

1972 ◽  
Vol 9 (4) ◽  
pp. 430-446 ◽  
Author(s):  
G. G. Meyerhof ◽  
Gopal Ranjan
Keyword(s):  
Bearing Capacity ◽  
Reasonable Agreement ◽  
Free Standing ◽  
New Approach ◽  
Methods Of Analysis ◽  
Inclined Loads ◽  
Loading Tests ◽  
Batter Piles ◽  
Piled Foundations ◽  
Plastic Theory

The bearing capacity of rigid vertical and batter piles under inclined loads in sand has been determined for model piles of different depth/diameter ratios. The first part of this paper deals with vertical piles and the second part will consider batter piles. The results of loading tests on free standing and piled foundations under inclinations of load varying from vertical to horizontal are analyzed. On the basis of plastic theory, a new approach for analysis of rigid vertical piles under horizontal loads is developed by extending Brinch Hansen's method; and previous methods of analysis by Meyerhof are extended to estimate the bearing capacity of vertical piles under inclined loads in sand. Loads on vertical piles are found to be in reasonable agreement with the proposed theories.

Bearing capacity of flexible piles under eccentric and inclined loads in layered soil

1991 ◽  
Vol 28 (6) ◽  
pp. 909-917 ◽  
Author(s):  
A. S. Yalcin ◽  
G. G. Meyerhof
Keyword(s):  
Bearing Capacity ◽  
Pile Group ◽  
Layered Soil ◽  
Pile Groups ◽  
Eccentric Load ◽  
Pile Capacity ◽  
Model Pile ◽  
Inclined Loads ◽  
Experimental Values ◽  
Flexible Model

The bearing capacity of flexible model piles and small pile groups under axial, lateral, and various combinations of eccentric and inclined loads in layered soil consisting of clay overlying sand is investigated. Ultimate pile capacity is found to depend on the eccentricity and inclination of the load and, more significantly, on the ratio of the upper layer thickness to pile embedment. Theoretical estimates based on the concept of effective pile embedment ratio and expressed in terms of equivalent rigid piles agree reasonably well with the experimental values. The behaviour of 2 × 2 flexible model pile groups is observed to be similar to that of single piles. Key words: bearing capacity, piles, flexible pile, pile group, layered soil, sand, clay, eccentric load, inclined load, model pile test.

Bearing capacity of rigid piles under eccentric and inclined loads

1985 ◽  
Vol 22 (3) ◽  
pp. 267-276 ◽  
Author(s):  
G. G. Meyerhof ◽  
V. V. R. N. Sastry
Keyword(s):  
Bearing Capacity ◽  
Soft Clay ◽  
Horizontal Load ◽  
Soil Pressure ◽  
Pile Capacity ◽  
Inclined Loads ◽  
Pure Moment ◽  
Load Tests ◽  
Rigid Model ◽  
Test Pile

The ultimate bearing capacity of instrumented vertical single rigid model piles in homogeneous loose sand and soft clay under vertical eccentric and central inclined loads has been investigated. The results of these load tests provide a more realistic lateral soil pressure distribution on the pile shaft and better theoretical estimates of pile capacity under pure moment and under horizontal load. For intermediate eccentricities and inclinations of the load, the bearing capacity can be obtained from simple interaction relationships between the axial load and moment capacities and between the axial and horizontal load capacities, respectively. The influence of lateral soil pressures due to installation of displacement piles in clay is examined in relation to the ultimate load of the pile. The analyses are compared with the results of model tests and some field case records. Key words: bearing capacity, clay, eccentric loading, horizontal load, instrumentation, model test, pile, sand.

Behaviour of pile foundations under special loading conditions: 1994 R.M. Hardy keynote address

1995 ◽  
Vol 32 (2) ◽  
pp. 204-222 ◽  
Author(s):  
G. G. Meyerhof
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Reasonable Agreement ◽  
Layered Soil ◽  
Lateral Loads ◽  
Pile Groups ◽  
Inclined Loads ◽  
Single Piles ◽  
Ultimate Resistance ◽  
Large Model

Previous analyses of the ultimate resistance and displacements of rigid piles under lateral loads and moments have been extended to the general case of eccentric and inclined loads on flexible piles by using the concept of effective embedment depths of equivalent rigid piles. Recent research on the behaviour of large model tests on instrumented rigid and flexible piles under eccentric and inclined loads in sand, clay, and layered soil is summarized. Reasonable agreement is found between observed and predicted behaviour. The proposed method of analysis is also supported by comparison with the results of many field case records of single piles and large pile groups under lateral loads indifferent types of soils. Key words : bearing capacity, displacement, eccentric loads, inclined loads, layered soil, pile.

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