A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study on the compression behavior and strain rate effect of Zhuhai soft clay
As a marine deposit, Zhuhai soft clay generally exhibits poor mechanical and engineering properties. In order to investigate its compression behavior, a series of incremental loading (IL) tests and constant rate of strain (CRS) tests were conducted on both intact and reconstituted samples. The compression index (Cc), coefficient of secondary compression (Ca), and the ratio Ca/Cc of Zhuhai clay were determined using the end of primary (EOP) concept. In IL tests, the ratio Ca/Cc was found to be non-constant, but varied with time and vertical stress. Furthermore, CRS tests revealed an unexpected strain rate effect that deviated from the classical stress-strain-strain rate relationships. Specifically, the compression curves obtained at different strain rates were not parallel, but gradually approached each other at high stress levels. Regression analysis results suggested a positive correlation between the strain rate and the compression index, indicating that higher strain rates resulted in a greater compression index. To acquire a comprehensive understanding of this unusual phenomenon, a concise review of several relevant works was conducted. It is postulated that the observed discrepancy between Zhuhai clay and the classical isotache concept may be attributed to the development of microstructure and the evolution of Ca/Cc during the loading.
Study on the compression behavior and strain rate effect of Zhuhai soft clay
As a marine deposit, Zhuhai soft clay generally exhibits poor mechanical and engineering properties. In order to investigate its compression behavior, a series of incremental loading (IL) tests and constant rate of strain (CRS) tests were conducted on both intact and reconstituted samples. The compression index (Cc), coefficient of secondary compression (Ca), and the ratio Ca/Cc of Zhuhai clay were determined using the end of primary (EOP) concept. In IL tests, the ratio Ca/Cc was found to be non-constant, but varied with time and vertical stress. Furthermore, CRS tests revealed an unexpected strain rate effect that deviated from the classical stress-strain-strain rate relationships. Specifically, the compression curves obtained at different strain rates were not parallel, but gradually approached each other at high stress levels. Regression analysis results suggested a positive correlation between the strain rate and the compression index, indicating that higher strain rates resulted in a greater compression index. To acquire a comprehensive understanding of this unusual phenomenon, a concise review of several relevant works was conducted. It is postulated that the observed discrepancy between Zhuhai clay and the classical isotache concept may be attributed to the development of microstructure and the evolution of Ca/Cc during the loading.
Study on the compression behavior and strain rate effect of Zhuhai soft clay
Lu, Xingbang (author) / Ding, Wenqi (author) / Li, Aiguo (author) / Qiao, Yafei (author)
European Journal of Environmental and Civil Engineering ; 28 ; 479-492
2024-01-25
14 pages
Article (Journal)
Electronic Resource
English
| Online Contents | 2013
Predictive ability of strain rate effect on soft clay behavior
| British Library Conference Proceedings | 1994
Strain-rate effects on stress-strain-strength behavior of a soft clay
| British Library Conference Proceedings | 1999
| British Library Online Contents | 1998
Strain rate effect on pressuremeter test results on soft clay
| British Library Conference Proceedings | 2001