Influence of the textural anisotropy of laminated and overconsolidated cohesive soils on their strength parameters with an example from the “Krakowiec clays”

1975 ◽  
Vol 12 (1) ◽  
pp. 79-81
Author(s):  
R. Kaczyński
Keyword(s):  
Cohesive Soils ◽  
Strength Parameters ◽  
Textural Anisotropy

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.

Design and performance evaluation of vertical shafts: rational shaft design method and verification of design method

1988 ◽  
Vol 25 (2) ◽  
pp. 320-337 ◽  
Author(s):  
R. C. K. Wong ◽  
P. K. Kaiser
Keyword(s):  
Design Method ◽  
Three Dimensional ◽  
Earth Pressure ◽  
In Situ Stress ◽  
Cohesive Soils ◽  
Strength Parameters ◽  
Yield Zone ◽  
Ground Deformations ◽  
And Performance

Ground deformations around axisymmetric shafts cannot be determined with the design approaches currently available, which are mostly based on plasticity methods. The convergence–confinement method (usually applied to tunnels), with consideration of gravitational effects and the three-dimensional conditions near a shaft, is proposed as a tool to predict formation pressure on a shaft and radial ground displacements. It is shown that the behaviour of a shaft is governed by (1) the mode of yield initiation dominated by the in situ stress state and the soil strength parameters and (2) the extent of the yield zone that develops if wall displacements are allowed to occur during construction.Closed-form solutions are presented to approximate the pressure–displacement relationship for cohesionless and cohesive soils. Results from this approach compare well with those obtained by finite element analyses. The conventional design methods that provide the minimum support pressures required to maintain stability are not conservative. These pressures are generally less than those actually encountered if ground movements during construction are restricted with good ground control. Key words: shaft, design method, support, interaction, yielding, stress, displacement, earth pressure, arching.

scholarly journals The meaning of effective soil parameters for determining of the bearing capacity of cohesive soils

2014 ◽  
Vol 13 (2) ◽  
pp. 057-064
Author(s):  
Krzysztof Wilk
Keyword(s):  
Bearing Capacity ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soil Parameters ◽  
Physical Parameters ◽  
Cohesive Soils ◽  
Strength Parameters ◽  
Triaxial Apparatus ◽  
Soil Skeleton

The paper presents the analysis of the bearing capacity of cohesive soils, which was calculated based on the PN-EN-1997-1 methodology. This computations take into account the effect of pore water pressure on the soil strength parameters. The parameters for calculating the strength of the soil can be determined by direct tests (triaxial apparatus) or by indirect methods. Used in the previous norm PN-81/B-03020 correlations of physical parameters and strength parameters relate to the total stress. They do not include, what part of the stress is carried by an increase the pore water pressure, and what part acts on the soil skeleton. The problem of dispersion efficiency of excessive the pore water pressure during load relates in particular the soils with the fine particle sizes - cohesive soils. There is no defined dependencies, which can be used in indirect determining the bearing capacity of cohesive substrate according to PN-EN-1997-1.

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