An improved bounding surface model for overconsolidated gassy clay
[1]ZHONG Yanhui,WANG Yifan,CAI Hongjian,et al.An improved bounding surface model for overconsolidated gassy clay[J].Journal of Zhengzhou University (Engineering Science),2027,48(XX):1-8.[doi:10.13705/j.issn.1671-6833.2026.06.009]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
48
Number of periods:
2027 XX
Page number:
1-8
Column:
Public date:
2027-12-10
- Title:
- An improved bounding surface model for overconsolidated gassy clay
- Keywords:
- Gassy clay ; Constitutive model ; Over-consolidation ; Dilatancy relation ; Bounding surface model; Undrained shear strength
- CLC:
- TU431TU447P736
- Abstract:
- Gassy clay is widely distributed in soft clay deposits and often exhibits significant overconsolidation characteristics. However, most existing constitutive models were developed for normally consolidated clay, making it difficult to accurately describe the complex mechanical behaviors of overconsolidated gassy clay, such as peak strength and strain softening. Therefore, based on bounding surface theory, a shape adjustable yield surface equation was introduced, and a dilatancy equation reflecting the variation in the degree of overconsolidation was constructed. By coupling the bubble damage effect with the bubble flooding effect induced by pore water pressure, a constitutive model suitable for the mechanical behavior of overconsolidated gassy clay was established. Using the proposed model, theoretical predictions of undrained shear strength were compared with experimental results for Malaysian kaolin and Speciwhite kaolin under different gas and overconsolidation characteristics. Validation results indicated that the model accurately captured the strength enhancement behavior dominated by the bubble flooding effect at low pore water pressures, as well as the strength degradation phenomenon dominated by the damage effect at high pore water pressures. Furthermore, it effectively predicted the stress strain relationships, effective stress paths, and the evolution of undrained shear strength for Malaysian kaolin and Speciwhite kaolin under varying overconsolidation ratios, initial degrees of saturation, and pore water pressures.
- References:
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Last Update:
2026-06-29
