Pore Pressure and Strength Behaviors of Reconstituted Marine Sediments Involving Thermal Effects
Publication: International Journal of Geomechanics
Volume 21, Issue 4
Abstract
The thermal effects on the pore-water pressure and strength behavior of marine sediments from the South China Sea were studied by using temperature-controlled triaxial shear tests on reconstituted specimens. The experimental program included consolidation at a temperature of 5°C, undrained and drained heating from 5°C to 50°C, and undrained triaxial shear at 5°C and 50°C. The results indicated that the normalized heating-induced pore-water pressure increased with increasing temperature at the undrained heating stage. The undrained shear strength of the specimens under undrained or drained heating was 14.1% lower or 11.2% higher than that of specimens at 5°C, respectively. The shear-induced pore-water pressure of the specimens under undrained and drained heating was lower than that of the specimens at 5°C by 60.5% and 20.3%, respectively. The increasing temperature caused an increase in the slope of the critical state line (M).
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Acknowledgments
The authors acknowledge financial support from the National Natural Science Foundation of China (Grant Nos. 51639002 and 51890912) and the Fundamental Research Funds for the Central Universities (No. B200202091).
Notation
The following symbols are used in this paper:
- e0
- initial void ratio;
- Gs
- specific gravity;
- g
- constant value related to the soil;
- IL
- liquidity index;
- Ip
- plasticity index;
- M
- slope of the critical state line;
- M0
- initial slope of the critical state line;
- p′
- mean effective stress;
- initial mean effective stress;
- q
- deviator stress;
- T
- temperature;
- w
- water content;
- wL
- liquid limit;
- wP
- plastic limit;
- ΔT
- temperature increment;
- Δus
- shearing-induced pore-water pressure;
- ΔuT
- heating-induced pore-water pressure;
- ɛvT
- heating-induced volume change;
- ρ
- initial density of the specimen;
- effective confining pressure after heating; and
- effective confining pressure before heating.
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Published In
International Journal of Geomechanics
Volume 21 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 24, 2020
Accepted: Nov 27, 2020
Published online: Feb 15, 2021
Published in print: Apr 1, 2021
Discussion open until: Jul 15, 2021
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