Model tests on single piles in soft clay

2000 ◽  
Vol 37 (4) ◽  
pp. 890-897 ◽  
Author(s):  
J L Pan ◽  
A TC Goh ◽  
K S Wong ◽  
C I Teh
Keyword(s):  
Soft Clay ◽  
Model Tests ◽  
Laboratory Model ◽  
Soil Pressure ◽  
Soil Movement ◽  
Pressure Transducers ◽  
Pile Shaft ◽  
Single Piles ◽  
Lateral Soil Movement ◽  
Passive Pile

Laboratory model tests in soft clay were conducted to investigate the behaviour of single piles subjected to lateral soil movements ('passive' pile), and to determine the ultimate soil pressure acting along the pile shaft. A specially designed apparatus for the tests was manufactured and calibrated. Reasonably consistent soil samples were prepared for the tests by a consolidometer. The limiting soil pressures acting along the model pile shaft were measured by pressure transducers. The ultimate soil pressure was then determined based on the maximum value of the limiting soil pressures acting along the pile shaft. The ultimate soil pressure obtained from the single passive pile tests was 10.6su (where su is the undrained shear strength of the clay) and agreed well with those from the literature.Key words: pile, foundation, lateral soil movement, clay, model test.

scholarly journals Model Tests on Single Piles Subjected to Lateral Soil Movement

1995 ◽  
Vol 35 (4) ◽  
pp. 85-92 ◽  
Author(s):  
H.G. Poulos ◽  
L.T. Chen ◽  
T.S. Hull
Keyword(s):  
Model Tests ◽  
Soil Movement ◽  
Single Piles ◽  
Lateral Soil Movement

Effect of consolidation on responses of a single pile subjected to lateral soil movement

2015 ◽  
Vol 52 (6) ◽  
pp. 769-782 ◽  
Author(s):  
L.Z. Wang ◽  
K.X. Chen ◽  
Y. Hong ◽  
C.W.W. Ng
Keyword(s):  
Soft Clay ◽  
Bending Moment ◽  
Coefficient Of Consolidation ◽  
Construction Period ◽  
Soil Movement ◽  
Centrifuge Tests ◽  
Short Period ◽  
Lateral Soil Movement ◽  
Pile Response ◽  
Pile Length

Given extensive research carried out to study pile response subjected to lateral soil movement in clay, the effect of consolidation on the pile–soil interaction is rarely considered and systematically investigated. For this reason, four centrifuge tests were conducted to simulate construction of embankment adjacent to existing single piles in soft clay, considering two typical drainage conditions (i.e., drained and undrained conditions) and two typical pile lengths (i.e., relatively long pile and short pile). The centrifuge tests were then back-analyzed by three-dimensional coupled-consolidation finite element analyses. Based on reasonable agreements between the two, numerical parametric studies were conducted to systematically investigate and quantify the influence of construction rate and pile length on pile response. It is revealed that by varying drainage conditions, the piles respond distinctively. When the embankment is completed within a relatively short period (cvt/d2 < 2, where cv, t, and d denote the coefficient of consolidation, construction period, and pile diameter, respectively), the pile located adjacent to it deforms laterally away from the embankment. Induced lateral pile deflection (δ) and bending moment reduce with construction period. On the contrary, embankment constructed within a relatively long period (cvt/d2 > 200) leads the pile to deform laterally towards the embankment, with δ and bending moment increases with construction period. By halving the length of pile embedded in the drained ground, the maximum induced bending moment (BMmax) was slightly reduced (by 23%). On the other hand, shortening the length of the pile in the undrained ground is much more effective in reducing BMmax, i.e., halving pile length resulting in 78% reduction in bending moment. A new calculation chart, which takes various drainage conditions and pile lengths into account, was developed for estimation of BMmax.

Rigid pile with a baseplate under large moments: laboratory model evaluations

1996 ◽  
Vol 33 (6) ◽  
pp. 1021-1026 ◽  
Author(s):  
Yenumula VSN Prasad ◽  
T R Chari
Keyword(s):  
Carrying Capacity ◽  
Laboratory Tests ◽  
Model Tests ◽  
Laboratory Model ◽  
Horizontal Load ◽  
Soil Pressure ◽  
Pressure Distributions ◽  
Rigid Pile ◽  
Ultimate Moment ◽  
The Moment

Results of tests on a rigid embedded pile with baseplate are presented. Laboratory tests were conducted with an instrumented 102 mm rigid circular pile embedded in sand and subjected to combined moment and horizontal load. Two different backfills and two different baseplates were used. The rotation of pile and the soil pressure distributions along the length of the pile and at the bottom of the baseplate were measured. It was found that the moment carrying capacity of a rigid pile can be increased between 25 and 50% by using a baseplate. The investigations reported in this paper are useful in the design of directly embedded transmission-pole foundations. Key words:baseplate, model tests, rigid pile, sand, transmission poles, ultimate moment.

scholarly journals Model Tests on Single Batter Piles Subjected to Lateral Soil Movement

2019 ◽  
Vol 16 (1) ◽  
pp. 24-29
Author(s):  
Osamah Al-Salih ◽  
T. T. Sabbagh ◽  
Wisam Alawadi ◽  
I.Q. Al-abboodi
Keyword(s):  
Model Tests ◽  
Soil Movement ◽  
Lateral Soil Movement ◽  
Batter Piles

scholarly journals Model Tests on Pile Groups Subjected to Lateral Soil Movement

1997 ◽  
Vol 37 (1) ◽  
pp. 1-12 ◽  
Author(s):  
L.T. Chen ◽  
H.G. Poulos ◽  
T.S. Hull
Keyword(s):  
Model Tests ◽  
Pile Groups ◽  
Soil Movement ◽  
Lateral Soil Movement

Batter Pile Behavior Modeling Using Finite Difference Analysis

2014 ◽  
Vol 566 ◽  
pp. 199-204 ◽  
Author(s):  
Chien Yuan Chen ◽  
Chi Xun Tsai
Keyword(s):  
Finite Difference ◽  
Pile Foundation ◽  
Tall Buildings ◽  
Incline Angle ◽  
Mountainous Area ◽  
Soil Movement ◽  
Weak Layer ◽  
Pile Shaft ◽  
Lateral Soil Movement ◽  
The Moment

Pile foundation has been widely used in supporting various structures, for example, bridges and tall buildings in Taiwan. With the development of mountainous area, pile foundation has been used as mitigation slope movement. Batter piles used in a group pile subjected to lateral forces are common. In this study, we used 3D finite difference program to analyze the mechanical response of a batter pile subjected to lateral soil movement. In order to verify the correction of the numerical simulation, its validation was compared with a published case study. The analysis of a single pile in different incline angles subjected to lateral soil movement was modeled. Results of the analysis show that batter pile under the conditions of lateral soil movement will cause pile larger lateral displacement and increasing bending moment on the pile shaft. The pile displacement reduced with the increasing pile incline angle. Vertical pile shaft subjected to negative and positive moment during soil movement, while, only positive moment distributed in the batter pile shaft. The moment is higher in batter pile shaft in weak layer than in non-weak layer. The pile shaft maximum moment occurred nearby the interface of weak layer and stable layer. The moment increased with the incline angle of batter pile. While, the moment increasing ratio reduced with the increased incline angle.

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