Estimation of undrained shear strength in moderately OC clays based on field vane test data
详细信息 查看全文
- 作者：Iok-Tong Ng ; Ka-Veng Yuen ; Le Dong
- 关键词：Bayesian inference ; Empirical correlation ; Field vane test ; Model class selection ; Overconsolidated clay ; Undrained shear strength
- 刊名：Acta Geotechnica
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：12
- 期：1
- 页码：145-156
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Geoengineering, Foundations, Hydraulics; Continuum Mechanics and Mechanics of Materials; Geotechnical Engineering & Applied Earth Sciences; Soil Science & Conservation; Soft and Granular Matter, Compl
- 出版者：Springer Berlin Heidelberg
- ISSN：1861-1133
- 卷排序：12
文摘
The undrained shear strength (su) of cohesive soils is a crucial parameter for many geotechnical engineering applications. Due to the complexities and uncertainties associated with laboratory and in situ tests, it is a challenging task to obtain the undrained shear strength in a reliable and economical manner. In this study, a probabilistic model for the su of moderately overconsolidated clays is developed using the Bayesian model class selection approach. The model is based on a comprehensive geotechnical database compiled for this study with field measurements of field vane strength (su), plastic limit (PL), natural water content (Wn), liquid limit (LL), vertical effective overburden stress (\(\sigma_{\nu }^{\prime }\)), preconsolidation pressure (\(\sigma_{\text{p}}^{\prime }\)) and overconsolidated ratio (OCR). Comparison study shows that the proposed model is superior to some well-known empirical relationships for OC clays. The proposed probabilistic model not only provides reliable and economical estimation of su but also facilitates reliability-based analysis and design for performance-based engineering applications.