A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
In-situ evaluation of undrained shear strength from seismic piezocone penetration tests for soft marine clay in Jiangsu, China
Highlights The best estimation of s u is using cone resistance from the correlation coefficient values of the previous test results. The relationship between undrained shear strength and excess pore pressure is proposed and the pore pressure cone factor NΔu is about 8.03 in the Lianyungang site. Some soil depths are overconsolidated and the method using maximum excess pore pressure (Δu max) is a better method. Development of the relationship between s u and V s also follows a stiffness-strength correlation. There is a significant correlation between s u and V s through variable effective stress. Comparison of the results reveals that s u could be approximately estimated from the SCPTU basic readings, especially for V s. The empirical cone factors used for estimating s u have been well summarized as .
Abstract Undrained shear strength, is an important geotechnical parameter of soft clay. The seismic piezocone test (SCPTU) can provide valuable information regarding in-situ soil behavior and stratigraphy in geotechnical site investigation. Therefore, the relationships of with the data obtainable in SCPTU testing have long been a topic of research interest. The objective of this paper is to evaluate the s u of marine clay from Lianyungang in Jiangsu Province of China. First, existing methods for obtaining the s u values of clay soils from basic SCPTU penetrometer readings are reviewed. The relationships between s u and SCPTU parameters at the Lianyungang site are then determined. s u values derived from field vane testing and CPTU results are also discussed. The relationship between s u and the pore pressure cone factor is proposed and the pore pressure cone factor is shown to be approximately about 8.03, providing a means to estimate s u. A previously developed method of using maximum excess pore pressure is also utilized here for the overconsolidated clays within the stratigraphic sequence. Additionally, a relationship between s u and shear wave velocity is proposed, linking stiffness with strength in a stiffness-strength correlation. The derived correlations are in accordance with those previously reported in the literature, and the results also showed that SCPTU tests can be used comprehensively to estimate the s u of Jiangsu marine clay.
In-situ evaluation of undrained shear strength from seismic piezocone penetration tests for soft marine clay in Jiangsu, China
Highlights The best estimation of s u is using cone resistance from the correlation coefficient values of the previous test results. The relationship between undrained shear strength and excess pore pressure is proposed and the pore pressure cone factor NΔu is about 8.03 in the Lianyungang site. Some soil depths are overconsolidated and the method using maximum excess pore pressure (Δu max) is a better method. Development of the relationship between s u and V s also follows a stiffness-strength correlation. There is a significant correlation between s u and V s through variable effective stress. Comparison of the results reveals that s u could be approximately estimated from the SCPTU basic readings, especially for V s. The empirical cone factors used for estimating s u have been well summarized as .
Abstract Undrained shear strength, is an important geotechnical parameter of soft clay. The seismic piezocone test (SCPTU) can provide valuable information regarding in-situ soil behavior and stratigraphy in geotechnical site investigation. Therefore, the relationships of with the data obtainable in SCPTU testing have long been a topic of research interest. The objective of this paper is to evaluate the s u of marine clay from Lianyungang in Jiangsu Province of China. First, existing methods for obtaining the s u values of clay soils from basic SCPTU penetrometer readings are reviewed. The relationships between s u and SCPTU parameters at the Lianyungang site are then determined. s u values derived from field vane testing and CPTU results are also discussed. The relationship between s u and the pore pressure cone factor is proposed and the pore pressure cone factor is shown to be approximately about 8.03, providing a means to estimate s u. A previously developed method of using maximum excess pore pressure is also utilized here for the overconsolidated clays within the stratigraphic sequence. Additionally, a relationship between s u and shear wave velocity is proposed, linking stiffness with strength in a stiffness-strength correlation. The derived correlations are in accordance with those previously reported in the literature, and the results also showed that SCPTU tests can be used comprehensively to estimate the s u of Jiangsu marine clay.
In-situ evaluation of undrained shear strength from seismic piezocone penetration tests for soft marine clay in Jiangsu, China
Duan, Wei (author) / Cai, Guojun (author) / Liu, Songyu (author) / Puppala, Anand J. (author) / Chen, Ruifeng (author)
2019-06-13
Article (Journal)
Electronic Resource
English
Field Evaluation of Undrained Shear Strength from Piezocone Penetration Tests in Soft Marine Clay
| Taylor & Francis Verlag | 2010
Field Evaluation of Undrained Shear Strength from Piezocone Penetration Tests in Soft Marine Clay
| Online Contents | 2010
Modified approach to evaluation of undrained shear strength from piezocone tests in soft clays
| Online Contents | 2017
Modified approach to evaluation of undrained shear strength from piezocone tests in soft clays
| Taylor & Francis Verlag | 2017