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.

Experimental and Statistical Study on Single and Groups of Stone Columns

2020 ◽  
Vol 857 ◽  
pp. 399-408
Author(s):  
Maki J. Mohammed Al-Waily ◽  
Mohammed Y. Fattah ◽  
Maysa Salem Al-Qaisi
Keyword(s):  
Shear Strength ◽  
Stress Concentration ◽  
Bearing Capacity ◽  
Soft Clay ◽  
Undrained Shear Strength ◽  
Stone Columns ◽  
Stone Column ◽  
Dependent Variables ◽  
Undrained Shear ◽  
Improvement Ratio

In the present study, 24 laboratory models on soft clay treated with stone columns were carried out. The results for each case are analysed for the purpose of constructing a statistical model linking the variables studied. The experiments showed that the stress concentration and bearing capacity of soil treated with stone column increase with increasing the undrained shear strength (cu), number of columns and L/d ratio. The models represent a single stone column and a group of stone columns. The studied variables are three dependent variables, the stress concentration ratio (n), bearing capacity of soil treated with stone column (q) and the settlement improvement ratio (Sr) due to the existence of stone columns. The independent variables are six: the undrained shear strength of clay soil, with three values (6, 9 and 12 kPa), the number of stone columns (1, 2, 3 and 4 columns) and the length (L) to the diameter (D) of the stone column or (L/D) ratio in two values (6 and 8). Besides, the bearing capacity of the soil treated (q) with stone columns and the settlement improvement ratio were used in some statistical models as independents. After regression analysis, a set of equations that correlate the previous variables have been suggested. The incepted values for dependent variables are close to the laboratory results.

Study on the Variation Regularity of Shear Strength of Saturated Soft Clay under Cyclic Loading

2011 ◽  
Vol 250-253 ◽  
pp. 2388-2391 ◽  
Author(s):  
Xiao Ping Wang ◽  
Jian Qi Wu
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Bearing Capacity ◽  
Triaxial Test ◽  
Soft Clay ◽  
Undrained Shear Strength ◽  
Saturated Soft Clay ◽  
Undrained Shear

The stiffness and shear strength of soft clay attenuate under long-term cyclic loading, resulting in reduced foundation bearing capacity of road. The variation regularity of undrained shear strength of saturated soft clay which is normally consolidated or over consolidated under cyclic loading was studied with two-way vibration triaxial test, and some useful results are obtained.

scholarly journals Predicting wheel forces using bearing capacity theory for general planar loads

2018 ◽  
Author(s):  
James Hambleton ◽  
Samuel Stanier
Keyword(s):  
Bearing Capacity ◽  
Laboratory Testing ◽  
Undrained Shear Strength ◽  
Contact Length ◽  
Vertical Force ◽  
Contact Interface ◽  
Capacity Theory ◽  
Arbitrary Loading ◽  
Mobility Problem ◽  
Undrained Shear

This paper assesses the applicability of bearing capacity theory for evaluating the forces generated on wheels operating on clay under steady rolling conditions. Considering recent advances in bearing capacity theory, namely with respect to the interaction diagrams developed for general loading, a theoretical model for computing the horizontal force or torque from fundamental input parameters such as the vertical force (weight), wheel diameter, and undrained shear strength of the soil is presented. The predictions are compared with existing analytical solutions and data from laboratory testing, and reasonable agreement is demonstrated. The foremost conclusion is that bearing capacity theory can be used to obtain reasonable predictions of wheel forces analytically under any operating condition (driven, braked, or towed), provided the contact length and so-called contact angle, which defines the position of the contact interface, can be estimated. Aside from providing a rigorous and highly convenient framework for evaluating wheel forces under arbitrary loading, the analysis enables a natural physical interpretation of the mobility problem.

scholarly journals Behaviour of the Undrained Shear Strength of Soft Clay Reinforced with Natural Fibre

2019 ◽  
Vol 690 ◽  
pp. 012005
Author(s):  
N Suffri ◽  
M Jeludin ◽  
S Rahim
Keyword(s):  
Shear Strength ◽  
Soft Clay ◽  
Natural Fibre ◽  
Undrained Shear Strength ◽  
Undrained Shear

Bearing capacity under increasing undrained shear strength

2020 ◽  
Vol 20 (5) ◽  
pp. 295-307
Author(s):  
André Arnold ◽  
Manuel Krähenbühl ◽  
Weiyuan Zhang ◽  
Amin Askarinejad
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Undrained Shear Strength ◽  
Undrained Shear

scholarly journals Evaluation of Undrained Shear Strength of Soft Clay with Consideration of Sample Quality

2000 ◽  
Vol 40 (3) ◽  
pp. 29-42 ◽  
Author(s):  
Takashi Tsuchida
Keyword(s):  
Shear Strength ◽  
Soft Clay ◽  
Undrained Shear Strength ◽  
Sample Quality ◽  
Undrained Shear
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