Effects of Pile Driving in Clays

1972 ◽  
Vol 9 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Kaare Flaate
Keyword(s):  
Shear Strength ◽  
Undrained Shear Strength ◽  
Pile Driving ◽  
Surface Strength ◽  
Deformation Properties ◽  
Average Water ◽  
Strength And Deformation ◽  
Pile Type ◽  
Timber Piles ◽  
Undrained Shear

This study summarizes the information given in the literature as well as observations made by the author. The effects of driving piles on remolding, stresses, and properties of the clay are considered. It is concluded that timber piles cause strong remolding of a zone extending to 10–15 cm from the pile surface. Strength and deformation properties will undergo changes beyond this zone as well. Pile type, pile density, soil properties, and driving conditions influence the results. There seems to be very small changes in the average water content, since the reduction adjacent to the pile is counter-balanced by an increase between the piles. The undrained shear strength adjacent to the pile is in one case found to be much higher than the skin friction at failure.

Some Pile Loading Tests in Stiff Clay

1964 ◽  
Vol 1 (2) ◽  
pp. 63-80 ◽  
Author(s):  
K Y Lo ◽  
A G Stermac
Keyword(s):  
Shear Strength ◽  
Effective Stress ◽  
Undrained Shear Strength ◽  
Load Testing ◽  
Loading Tests ◽  
Stiff Clay ◽  
Vertical Effective Stress ◽  
Set Up ◽  
Timber Piles ◽  
Undrained Shear

Loading tests on two timber piles and a Franki pile, embedded principally in a stiff clay, were carried out. Analysis of the results appear to indicate that the adhesion of the piles is the fully mobilized undrained shear strength of the clay. Reasons for this apparent anomaly with data reported in the literature are suggested.Pore water pressures set up in the soil adjacent to the piles during load testing were very small and calculations in terms of effective stresses, indicated that the ratio of horizontal to vertical effective stress at failure is approximately 1.2.

scholarly journals Evaluation of Undrained Shear Strength of Miocene Clay from the Weight Sounding Test (WST)

2017 ◽  
Vol 62 (2) ◽  
pp. 367-384
Author(s):  
Sebastian Olesiak
Keyword(s):  
Shear Strength ◽  
Field Testing ◽  
Field Investigation ◽  
Undrained Shear Strength ◽  
Cohesive Soils ◽  
Strength Parameters ◽  
Additional Measurement ◽  
Carpathian Foredeep ◽  
Innovative Solution ◽  
Undrained Shear

Abstract Soil strength parameters needed for the calculation of bearing capacity and stability are increasingly determined from field testing. This paper presents a method to determine the undrained shear strength cuWST of the soil, based on the Weight Sounding Test (WST). The innovative solution which allows for a significant reduction of equipment needed for geotechnical field investigation is presented. The proposed method is based on an additional measurement of the torque during testing. It then becomes possible to estimate the undrained shear strength, cuWST of the soil, using the correlation given in this paper. The research results presented in this paper were carried out on selected cohesive soils, Miocene clays from the Carpathian Foredeep.

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