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.

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.

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.

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 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.

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.

Lateral soil pressures and displacements of rigid piles in homogeneous soils under eccentric and inclined loads

1986 ◽  
Vol 23 (3) ◽  
pp. 281-286 ◽  
Author(s):  
V. V. R. N. Sastry ◽  
G. G. Meyerhof
Keyword(s):  
Soft Clay ◽  
Test Results ◽  
Soil Pressure ◽  
Eccentric Load ◽  
Load Range ◽  
Pressure Distributions ◽  
Inclined Loads ◽  
Rigid Model ◽  
Test Pile ◽  
Theoretical Pressure

The lateral soil pressures, tip load, and displacements of instrumented single rigid model piles in homogeneous loose sand and soft clay under vertical eccentric and central inclined loads have been investigated. A comparison of the test results with theoretical pressure distributions and displacements of the pile for the working load range has been made. Reasonable agreement has been found between the observed and predicted displacements and suggested nondimensional p–y curves. The analyses are also compared with the results of some field case records. Key words: displacements, clay, eccentric load, horizontal load, lateral soil pressure, instrumentation, model test, pile, sand.

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.

Behaviour of rigid piles in layered soils under eccentric and inclined loads

1986 ◽  
Vol 23 (4) ◽  
pp. 451-457 ◽  
Author(s):  
V. V. R. N. Sastry ◽  
G. G. Meyerhof ◽  
T. Koumoto
Keyword(s):  
Bearing Capacity ◽  
Soft Clay ◽  
Layered System ◽  
Horizontal Load ◽  
Eccentric Load ◽  
Pile Capacity ◽  
Total Load ◽  
Tip Resistance ◽  
Inclined Loads ◽  
Predicted Values

The lateral soil pressures, ultimate bearing capacity, and displacements of instrumented vertical single rigid model piles in a layered system consisting of soft clay overlying loose sand and subjected to vertical eccentric and central inclined loads have been investigated. The variation of lateral soil pressures and the tip resistance of the pile are analysed with respect to the total load or moment on the pile. Theoretical estimates of pile capacity in homogeneous soils under pure moment and under horizontal load have been extended to piles in a layered system. For intermediate eccentricities and inclinations of the load, the pile capacity can be estimated from simple interaction relations or semiempirical eccentricity and inclination factors. The pile displacements are analysed in the light of linear elastic theory and nondimensional p − y curves. Reasonable agreement has been found between the measured and predicted values. Key words: bearing capacity, clay, displacements, eccentric load, horizontal load, lateral pressure, layered system, model test, pile, sand.

Floating piles in soft, highly plastic clays

1983 ◽  
Vol 20 (1) ◽  
pp. 159-168 ◽  
Author(s):  
Per-Evert Bengtsson ◽  
Göran Sällfors
Keyword(s):  
Bearing Capacity ◽  
Soft Clay ◽  
Undrained Shear Strength ◽  
Case Histories ◽  
Load Range ◽  
Method Of Calculation ◽  
Tension Tests ◽  
Load Tests ◽  
Plastic Clays ◽  
Undrained Shear

In Sweden the bearing capacity of axially loaded floating piles in soft clay is calculated using the undrained shear strength of the clay (often determined by the field vane test). In this study several load tests, compression as well as tension tests, have been made on well-instrumented piles. The results from these tests, in combination with thorough investigations of the field vane test, have led to a well-documented understanding of the behaviour of floating piles in soft clay.In the article, a method is presented that makes it possible to calculate the load–displacement variation in the permissible load range, as well as the bearing capacity. Results from several load tests are presented and predictions are compared with performance. Keywords: soft clay, time dependence, floating piles, bearing capacity, load tests, method of calculation, case histories.

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

1981 ◽  
Vol 18 (4) ◽  
pp. 514-519 ◽  
Author(s):  
G. G. Meyerhof ◽  
S. K. Mathur ◽  
A. J. Valsangkar
Keyword(s):  
Bearing Capacity ◽  
Ultimate Bearing Capacity ◽  
Test Results ◽  
Pile Groups ◽  
Free Standing ◽  
Previous Theory ◽  
Inclined Loads ◽  
Load Tests ◽  
Batter Piles ◽  
Theory And Model

The ultimate bearing capacity of rigid vertical and batter piles and pile groups in layered sand 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 inclinations and on free-standing groups 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.

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