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A bounding surface model for gassy clay
Abstract Gassy clay can be frequently encountered in the seabed. Gassy clay is a composite material with a saturated soil matrix and discrete gas bubbles. The soil behaviour is significantly affected by the interaction between the soil matrix and gas bubbles. Existing constitutive models have all focused on the response of normally consolidated clay. These models cannot give reasonable prediction of pore water pressure evolution for overconsolidated clay in shear. This can cause poor prediction of overconsolidated gassy clay behaviour because pore water pressure has a significant influence on soil-gas interaction. A new bounding surface model for gassy clay is proposed to model the elastoplastic behaviour of this soil. The gas cavities are assumed to have a detrimental effect on the plastic modulus and shear strength as they affect the integrity of the soil structure. Bubble flooding can occur within the soil, which makes the saturated soil matrix partially drained under a globally undrained condition, leading to higher stiffness and shear strength of gassy clay. The model has been validated by the undrained triaxial compression tests on gassy Malaysian Kaolin and Speciwhite Kaolin clay. Effect of the total stress path on undrained gassy clay behaviour has been analysed.
A bounding surface model for gassy clay
Abstract Gassy clay can be frequently encountered in the seabed. Gassy clay is a composite material with a saturated soil matrix and discrete gas bubbles. The soil behaviour is significantly affected by the interaction between the soil matrix and gas bubbles. Existing constitutive models have all focused on the response of normally consolidated clay. These models cannot give reasonable prediction of pore water pressure evolution for overconsolidated clay in shear. This can cause poor prediction of overconsolidated gassy clay behaviour because pore water pressure has a significant influence on soil-gas interaction. A new bounding surface model for gassy clay is proposed to model the elastoplastic behaviour of this soil. The gas cavities are assumed to have a detrimental effect on the plastic modulus and shear strength as they affect the integrity of the soil structure. Bubble flooding can occur within the soil, which makes the saturated soil matrix partially drained under a globally undrained condition, leading to higher stiffness and shear strength of gassy clay. The model has been validated by the undrained triaxial compression tests on gassy Malaysian Kaolin and Speciwhite Kaolin clay. Effect of the total stress path on undrained gassy clay behaviour has been analysed.
A bounding surface model for gassy clay
Cai, Hongjian (author) / Gao, Zhiwei (author) / Hong, Yi (author) / Zhang, Jianfeng (author)
2023-05-29
Article (Journal)
Electronic Resource
English
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