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.

Some Recent Research on the Bearing Capacity of Foundations

1963 ◽  
Vol 1 (1) ◽  
pp. 16-26 ◽  
Author(s):  
George Geoffrey Meyerhof
Keyword(s):  
Bearing Capacity ◽  
Model Tests ◽  
Vertical Load ◽  
Pile Groups ◽  
Free Standing ◽  
Flexible Foundations ◽  
Inclined Loads ◽  
Single Piles ◽  
Piled Foundations

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 foundation depth, eccentricity and inclination of the load. Simple formulae have been derived for use in practice and their application to the design of rigid and flexible foundations is briefly indicated.The second part of the paper discusses the bearing capacity of single piles under vertical and inclined loads. The bearing capacity of piled foundations and free-standing pile groups is outlined, and the results of model tests on pile groups under central and eccentric loads are briefly analysed in relation to some problems in practice.

Full-displacement pressuremeter method for rigid piles under lateral loads and moments

1987 ◽  
Vol 24 (4) ◽  
pp. 471-478 ◽  
Author(s):  
G. G. Meyerhof ◽  
V. V. R. N. Sastry
Keyword(s):  
Model Test ◽  
Reasonable Agreement ◽  
Lateral Pressure ◽  
Layered Soil ◽  
Horizontal Load ◽  
Ultimate Capacity ◽  
Lateral Loads ◽  
Inclined Loads ◽  
Pure Moment ◽  
Rigid Model

The results of full-displacement pressuremeter tests in beds of sand, clay, and layered soil have been used to estimate the lateral soil pressures, ultimate capacity, and displacements of instrumented rigid model piles under eccentric and inclined loads. Comparisons of these estimates with observations on the piles under horizontal load and pure moment have been made and reasonable agreement is found. The analyses are also compared with some field case records. Key words: bearing capacity, clay, displacements, horizontal load, lateral pressure, layered soil, model test, moment, pile, pressuremeter, sand.

Analysis of bearing capacity of rigid piles under eccentric and inclined loads

1986 ◽  
Vol 23 (2) ◽  
pp. 127-131 ◽  
Author(s):  
T. Koumoto ◽  
G. G. Meyerhof ◽  
V. V. R. N. Sastry
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Ultimate Load ◽  
Ultimate Bearing Capacity ◽  
Experimental Results ◽  
Inclined Loads ◽  
Single Piles ◽  
Strip Footings

An investigation is made of the eccentricity and inclination factors for estimating the ultimate bearing capacity of rigid single piles in homogeneous soils under eccentric and inclined loads. For combined eccentric inclined loads the corresponding theoretical factors are obtained by combining inclination factors and eccentricity factors, which are derived from extending the theory of inclination factors for shallow strip footings. The theoretical values of inclination factors, eccentricity factors, and eccentric inclination factors are compared with some experimental results of model piles in sand and clay. Key words: bearing capacity, clay, eccentricity factors, eccentric inclination factors, inclination factors, rigid piles, sand, ultimate load.

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.

Standard penetration tests and pile behaviour under lateral goads in cohesioniess soils

1995 ◽  
Vol 32 (5) ◽  
pp. 913-916 ◽  
Author(s):  
G.G. Meyerhof
Keyword(s):  
Key Words ◽  
Reasonable Agreement ◽  
Soil Resistance ◽  
Lateral Loads ◽  
Resistance Standard ◽  
Ultimate Resistance ◽  
Penetration Tests

Previous analyses of the ultimate resistance and displacements of flexible piles under lateral loads in cohesioniess soils have been reevaluated by using simple correlations based on standard penetration tests. Reasonable agreement is found between observed and predicted behaviour, and the new estimates are similar to those from the previous more elaborate methods. Key words : cohesioniess soils, displacements, lateral loads, soil resistance, standard penetration tests.

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.

Ultimate pile capacity in layered soil under eccentric and inclined loads

1985 ◽  
Vol 22 (3) ◽  
pp. 399-402 ◽  
Author(s):  
G. G. Meyerhof ◽  
R. D. Purkayastha
Keyword(s):  
Bearing Capacity ◽  
Layered Soil ◽  
Clay Layer ◽  
Pile Groups ◽  
Eccentric Load ◽  
Pile Capacity ◽  
Foundation Model ◽  
Load Tests ◽  
Rigid Model ◽  
Single Piles

The ultimate bearing capacity of rigid model piles and pile groups in layered soil consisting of clay overlying sand has been investigated for various combinations of eccentricity and inclination of load and with varying thicknesses of clay layer. The effect of eccentricity and inclination of the load and thickness ratios of clay layer to pile embedment in the sand on the bearing capacity can be represented by simple interaction relationships to estimate the ultimate load. The results of load tests on single model piles and freestanding pile groups are presented in the form of polar bearing capacity diagrams and are compared with the theoretical estimates. The thickness of clay layer on the sand is found to have a significant influence on the bearing capacity of single piles and pile groups. Key words: pile foundation, model test, layered soil, eccentric load, inclined load, sand, clay, analysis, bearing capacity.

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.

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