Capacité portante de pieux isolés dans les argiles sensibles: étude de cas par la méthode pénétrométrique

1989 ◽  
Vol 26 (3) ◽  
pp. 375-384 ◽  
Author(s):  
Marius Roy ◽  
Luc Tanguay
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Cohesive Soils ◽  
Friction Component ◽  
Good Potential ◽  
Capacité Portante ◽  
Loading Tests ◽  
Single Piles ◽  
Lateral Friction

The penetrometer test has been used to determine the bearing capacity of driven and jacked-in single piles in sensitive clays. The cases presented in this paper were carried out on two sites with steel, concrete, and wooden piles. The bearing capacities calculated on the basis of the results of penetrometer tests show that this approach has a good potential and at the same time is simple and fast. It has been possible to obtain a calibration by a comparison with the loading tests carried out on each of the piles. Taking into account the low strength of some of our clays, experience has to be gained in order to adapt the lateral unit friction curves to our clays. This approach also has the advantage of allowing the determination of the bearing capacity of wooden piles and of taking into account the conical effect when determining the lateral friction component. Key words: penetrometer test, piles, bearing capacity, cohesive soils, point resistance, lateral friction, steel, concrete, wood. [Journal translation]

Comportement, en chambre triaxiale, d'un pieu à frottement dans l’argile

1991 ◽  
Vol 28 (3) ◽  
pp. 434-445
Author(s):  
Marius Roy ◽  
Sylvain Roy ◽  
Jean Dubé
Keyword(s):  
Key Words ◽  
Rate Of Penetration ◽  
Pore Pressures ◽  
Model Pile ◽  
Constant Rate ◽  
Order Of Magnitude ◽  
Loading Tests ◽  
Full Scale Tests ◽  
Friction Pile ◽  
Lateral Friction

This study deals with the behaviour of a friction pile in a clay, in a triaxial chamber, and in particular with the generation of pore pressures during driving, and with the mobilization of lateral friction during loading tests at constant rate of penetration and static. The results show that the setting compares with that of a piezocone, and that the pore pressures generated at the point during driving, in the laboratory, are of the same order of magnitude as those obtained on the field. The conditions of reconsolidation used in the laboratory, which define the effective stresses around the pile, allow the calculation of the lateral friction on the model pile. The same conditions of reconsolidation were applied to the full-scale tests, on the Maskinongé site, and yielded values of angles of friction δ of 16° for steel and 20° for concrete. Key words: pile, clay, triaxial chamber, friction, pore pressure. [Journal translation]

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.

scholarly journals Proposal for calculating the bearing capacity of screw displacement piles in non-cohesive soils based on CPT results

2012 ◽  
Vol 34 (4) ◽  
pp. 41-51 ◽  
Author(s):  
Adam Krasiński
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Load Transfer ◽  
Transfer Functions ◽  
Cohesive Soil ◽  
Cohesive Soils ◽  
Considerable Influence ◽  
Calculation Methods ◽  
Capacity Calculation ◽  
Loading Tests

Abstract Screw displacement pile technology is relatively new and is still being developed. A specific characteristic of those piles is their very considerable influence on soil properties during the installation, which renders classical bearing capacity calculation methods insufficient. Some methods for calculating the bearing capacity of screw displacement piles have already been presented in literature, for example, by Bustmante and Gianesselli [2], [3], Van Impe [17], [18], Maertens and Huybrechts [15], Ne Smith [16] as well as Basu and Prezzi [1]. This paper proposes a new method of calculating the bearing capacity of screw displacement piles in non-cohesive soil which is based on CPT results. It has been devised as a result of research project No. N N506 432936 [11], carried out in 2009-2011. At 6 experimental sites screw displacement pile static loading tests were carried out together with CPTU tests of the subsoil. The results allowed us to establish soil resistances along the shaft ts as well as under the pile base qb and their correlations to the CPT soil cone resistances qc. Two approaches, both adapted to the general guidelines of Eurocode 7 (EC7) [20], were proposed: a classical approach and the second approach with load transfer functions application.

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.

Bearing capacity tests on strip footing resting on reinforced sand subgrades

1989 ◽  
Vol 26 (1) ◽  
pp. 154-159 ◽  
Author(s):  
M. A. Mahmoud ◽  
F. M. Abdrabbo
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Key Words ◽  
Strip Footing ◽  
Test Results ◽  
Reinforced Sand ◽  
Loading Tests ◽  
Load Displacement

This note presents an experimental study concerning a method of improving the bearing capacity of strip footing resting on sand subgrades utilizing vertical nonextensible reinforcement. The test results indicate that this type of reinforcement increases the bearing capacity of subgrades and modifies the load–displacement behaviour of the footing. Key words: bearing capacity, nonextensible reinforcement, loading tests, strip footing, reinforcing element.

La capacité portante à court terme de la glace de mer colonnaire annuelle

1986 ◽  
Vol 13 (2) ◽  
pp. 171-187 ◽  
Author(s):  
J. R. Murat ◽  
R. Tinawi
Keyword(s):  
Sea Ice ◽  
Surface Temperature ◽  
Bearing Capacity ◽  
Key Words ◽  
Ice Cover ◽  
Ice Thickness ◽  
Short Term ◽  
Capacité Portante ◽  
General Method

This paper deals with the bearing capacity of sea ice covers taking into consideration the nonhomogeneity of the material, which is primarily due to variations in temperature and salinity across the thickness. The study is limited to the evaluation of short-term loads that would cause cracking in the ice cover. The general method for evaluation of such loads is fully developed and simplified formulae are proposed for a given surface temperature and ice thickness. Key words: bearing capacity, sea ice.

Determination of Bearing Capacity of Cleared and Graded Areas at Airports

2021 ◽  
Vol 147 (1) ◽  
pp. 04020086
Author(s):  
Vittorio Ranieri ◽  
Nicola Berloco ◽  
Donato D’Auria ◽  
Vincenzo Disalvo ◽  
Veronica Fedele ◽  
...  
Keyword(s):  
Bearing Capacity

DETERMINATION OF AFTER-RIPENING PERIOD AND HORMONAL RESPONSE OF OROBANCHE SOLMSII C.D. CLARKE SEEDS

1970 ◽  
Vol 11 (1) ◽  
Author(s):  
A. Bista ◽  
G. B. Khattri ◽  
B. D. Acharya ◽  
S. C. Srivastava
Keyword(s):  
Growth Hormone ◽  
Seed Germination ◽  
Key Words ◽  
Incubation Period ◽  
Seed Set ◽  
Summer Season ◽  
Conditioning Period ◽  
Root Parasite ◽  
One Year

To find out the ability of Orobanche seeds to germinate immediately after seed set, seeds were germinated periodically at an interval of three months for one year in GR24. Some Orobanche seeds were capable of germination immediately after seed set but most required about nine months as after ripening or incubation period to be able to germinate. The phenomenon of after ripening in Orobanche seeds could be taken as an ecological measure to dormant over following unfavorable wet summer season. The growth hormone studies on Orobanche seed germination have shown that GA3 at a concentration of 100 ppm substantially enhanced seed germination when applied during pre-conditioning period. NAA showed some stimulatory effect at 0.5 - 1.0 ppm when applied during post-conditioning period but the hormone if applied during pre-conditioning period inhibited the germination. Kinetin failed to stimulate the germination at all the concentrations tested. Key words: Germination, root-parasite, hormone. Ecoprint Vol.11(1) 2004.

Determination of long-term strength of frozen soils and bearing capacity of piles by means of cone penetration test.

2020 ◽  
pp. 54-64
Author(s):  
I.B. Ryzhkov ◽  
◽  
M.A. Minkin ◽  
O.N. Isaev ◽  
◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Cone Penetration Test ◽  
Term Strength ◽  
Penetration Test ◽  
Cone Penetration ◽  
Frozen Soils

Determination of the bearing capacity of piles in permafrost by static penetration

1986 ◽  
Vol 23 (2) ◽  
pp. 58-63 ◽  
Author(s):  
Yu. G. Trofimenkov ◽  
M. A. Minkin ◽  
V. I. Gvozdik
Keyword(s):  
Bearing Capacity ◽  
Static Penetration
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