Integrating Multi-Source Information from Site Investigation for Probabilistic Characterization of Undrained Shear Strength

Geo-Risk 2017 ◽  
2017 ◽  
Author(s):  
Meng-Yao Shen ◽  
Zi-Jun Cao ◽  
Dian-Qing Li ◽  
Yu Wang
Keyword(s):  
Shear Strength ◽  
Site Investigation ◽  
Undrained Shear Strength ◽  
Source Information ◽  
Probabilistic Characterization ◽  
Undrained Shear

scholarly journals CPT-Based Probabilistic Characterization of Undrained Shear Strength of Clay

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Mi Tian ◽  
Xiaotao Sheng
Keyword(s):  
Shear Strength ◽  
Correlation Function ◽  
Random Field ◽  
Site Investigation ◽  
Undrained Shear Strength ◽  
Bayesian Approaches ◽  
Probabilistic Characterization ◽  
Undrained Shear

Applying random field theory involves two important issues: the statistical homogeneity (or stationarity) and determination of random field parameters and correlation function. However, the profiles of soil properties are typically assumed to be statistically homogeneous or stationary without rigorous statistical verification. It is also a challenging task to simultaneously determine random field parameters and the correlation function due to a limited amount of direct test data and various uncertainties (e.g., transformation uncertainties) arising during site investigation. This paper presents Bayesian approaches for probabilistic characterization of undrained shear strength using cone penetration test (CPT) data and prior information. Homogeneous soil units are first identified using CPT data and subsequently assessed for weak stationarity by the modified Bartlett test to reject the null hypothesis of stationarity. Then, Bayesian approaches are developed to determine the random field parameters and simultaneously select the most probable correlation function among a pool of candidate correlation functions within the identified statistically homogeneous layers. The proposed approaches are illustrated using CPT data at a clay site in Shanghai, China. It is shown that Bayesian approaches provide a rational tool for proper determination of random field model for probabilistic characterization of undrained shear strength with consideration of transformation uncertainty.

Extended multivariate approach for uncertainty reduction in the assessment of undrained shear strength in clays

2014 ◽  
Vol 51 (3) ◽  
pp. 231-245 ◽  
Author(s):  
Rasmus Müller ◽  
Stefan Larsson ◽  
Johan Spross
Keyword(s):  
Shear Strength ◽  
Site Investigation ◽  
Undrained Shear Strength ◽  
Multivariate Approach ◽  
Total Uncertainty ◽  
Investigation Methods ◽  
Measurement Results ◽  
Strength Formula ◽  
A Site ◽  
Undrained Shear

Important features of the multivariate approach are discussed, and an extension to this approach is proposed whereby the total uncertainty in site investigation methods due to spatial averaging is assessed prior to its adoption. Results from a site investigation of spatially averaged values of undrained shear strength ([Formula: see text]) and the corresponding coefficient of variation ([Formula: see text]) in Veda sulphide clay were used as a practical illustration of the extended multivariate approach and provide a basis for discussion. The inherent variability and scales of fluctuation for different methods are presented. The study shows the usefulness of the extended multivariate approach for the evaluation of representative values of [Formula: see text] and [Formula: see text] based on results from different methods. It is also a way of implicitly reducing the transformation errors that arise when a property is derived from measurement results. Nevertheless, considerable care must be taken as a much lower COV for one method will have a significant impact on the results.

Characterization of Singapore, Bangkok, and Ariake clays

2001 ◽  
Vol 38 (2) ◽  
pp. 378-400 ◽  
Author(s):  
Hiroyuki Tanaka ◽  
Jacques Locat ◽  
Satoru Shibuya ◽  
Tan Thiam Soon ◽  
Dinesh R Shiwakoti
Keyword(s):  
Shear Strength ◽  
Clay Mineral ◽  
Physical And Mechanical Properties ◽  
Site Investigation ◽  
Undrained Shear Strength ◽  
Mechanical Tests ◽  
Mineral Components ◽  
The Difference ◽  
A Site ◽  
Undrained Shear

A soil investigation was carried out at two sites in Singapore and Bangkok, Southeast Asia, and the results were compared with those from a site in Ariake, Japan. Soil samples at all the sites were retrieved using the Japanese sampling method to nullify the effect of sampling on sample quality. From the laboratory tests, consolidation characteristics and undrained shear strength were measured. In addition to the mechanical tests, X-ray diffraction and scanning electron microscope tests were carried out to identify clay minerals and to study their microstructure. Great differences in physical and mechanical properties of these clays were observed, which may be attributed to the difference in their clay mineral components and variation in the sedimentation environment.Key words: site investigation, marine clay, undrained shear strength, anisotropy, consolidation, clay mineral.

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