Multivariate distribution for undrained shear strengths under various test procedures

2013 ◽  
Vol 50 (9) ◽  
pp. 907-923 ◽  
Author(s):  
Jianye Ching ◽  
Kok-Kwang Phoon
Keyword(s):  
Shear Strength ◽  
Test Procedure ◽  
Undrained Shear Strength ◽  
Multivariate Distribution ◽  
Strain Rates ◽  
Test Procedures ◽  
Strength Based ◽  
Multivariate Probability Distribution ◽  
Stress States ◽  
Undrained Shear

The undrained shear strength (su) of a clay is not a constant. In particular, su values of a clay evaluated by different test procedures are different because these tests may have different stress states, stress histories, degrees of sampling disturbance, and strain rates. This study constructs the multivariate probability distribution of su from various test procedures based on a large clay database. This multivariate distribution provides an estimation of the normalized undrained shear strength based on four factors: test mode, overconsolidation ratio, strain rate, and plasticity. Once this multivariate distribution is constructed, interesting questions can be answered systematically using simple Bayesian analysis, e.g., given the su value for one test procedure, what is the updated mean and coefficient of variation of the su value for another test procedure?

scholarly journals Modeling parameters of structured clays as a multivariate normal distribution

2012 ◽  
Vol 49 (5) ◽  
pp. 522-545 ◽  
Author(s):  
Jianye Ching ◽  
Kok-Kwang Phoon
Keyword(s):  
Shear Strength ◽  
Probability Distribution ◽  
Normal Distribution ◽  
Multivariate Normal Distribution ◽  
Undrained Shear Strength ◽  
Multivariate Distribution ◽  
Soil Parameters ◽  
Multivariate Normal ◽  
Multivariate Probability Distribution ◽  
Undrained Shear

This study explores the possibility of modeling liquidity index, undrained shear strength, remolded undrained shear strength, preconsolidation stress, and vertical effective stress of structured clays (sensitive or quick clays) as a multivariate normal distribution. The literature is replete with correlation equations between two soil parameters. Consistent synthesis of more than two soil parameters through construction of a multivariate probability distribution function is rare, despite obvious practical usefulness of such an approach. This study compiles a large database of structured clays to construct the multivariate probability distribution among the aforementioned five soil parameters. This multivariate distribution is then used to simulate the correlations between soil parameters of interest and to derive useful equations for Bayesian inference. This constructed multivariate distribution and equations are further validated by another independent database of structured clays as well as by empirical equations proposed in the literature.

scholarly journals Effects of Strain Rates on the Undrained Shear Strength of Kaolin

2017 ◽  
Vol 40 (6) ◽  
pp. 20160101 ◽  
Author(s):  
S. Nanda ◽  
V. Sivakumar ◽  
P. Hoyer ◽  
A. Bradshaw ◽  
K. G. Gavin ◽  
...  
Keyword(s):  
Shear Strength ◽  
Undrained Shear Strength ◽  
Strain Rates ◽  
Undrained Shear

Soil improvement using electroosmosis with the injection of chemical solutions: field tests

2009 ◽  
Vol 46 (6) ◽  
pp. 727-733 ◽  
Author(s):  
Chang-Yu Ou ◽  
Shao-Chi Chien ◽  
Hsuan-Hsiang Chang
Keyword(s):  
Shear Strength ◽  
Treatment Time ◽  
Test Procedure ◽  
Sodium Silicate Solution ◽  
Undrained Shear Strength ◽  
Silty Clay ◽  
Cemented Soil ◽  
Laboratory Test Results ◽  
Chemical Solutions ◽  
Undrained Shear

Previous laboratory studies have shown that the injection of a calcium chloride solution followed by the injection of a sodium silicate solution during electroosmosis is effective in strengthening soft silty clay. Very stiff cemented soil near the anodes is formed after the treatment. This paper presents the effectiveness of the process in the field. Nine electrodes were installed using two grid arrangements with electrode spacings of 2.0 m × 2.5 m and 2.0 m × 5.0 m. The test procedure is similar to those employed in the laboratory. Test results show that the soil surrounding the anodes (within a diameter of 50–60 cm) became very stiff and cemented due to the effect of cementation between the two chemical solutions and soil particles under the electric field. Except for the areas of stiff cemented soil, the undrained shear strength of the soil between electrodes was increased substantially. Polarity reversal after normal polarity did not produce favorable improvement effects in terms of undrained shear strength of the soil and treatment time.

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.

Sign in / Sign up

Export Citation Format

Share Document