Abstract
The cavity expansion approach has been a popular tool to interpret a wide range of geotechnical problems over the last several decades. Most previous research focused on the expansion of cylindrical and/or spherical cavities, whereas nonstandard cavities have received much less attention. To address this shortcoming, this paper presents a general theoretical framework for two-dimensional (2D) displacement-controlled undrained noncircular cavity expansion (N-CCE) in undrained soil. The new approach combines strain path method (SPM) concepts and conformal mapping to determine the soil velocity and strain rate fields analytically. The soil displacement and strain subsequently are determined by integrating the soil velocities and strain rates along the strain path using a series of transformed ordinary differential equations. In this study, the modified Cam Clay (MCC) effective stress constitutive model was used to determine the soil stress–strain relationship, and consolidation effects were captured using finite-difference calculations. The proposed methodology was validated by comparing the reduced solution for a circular cavity with traditional circular cavity expansion theory. A parametric analysis subsequently was undertaken to explore the influence of three noncircular cavity shapes on expansion-induced soil deformation mechanisms, shear strains, effective stresses, and pore-water pressure development and consolidation. The proposed solution can be implemented with any critical state–based soil model and can be applied to arbitrary noncircular cavity problems.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work was supported by the National Natural Science Foundation of China, Grant/Award Nos. 51978105 and 52027812; the Chongqing Science Foundation for Distinguished Young Scholars, Grant/Award No. cstc2021jcyj-jqX0017; and the Chongqing Youth Top Talent Plan, Grant/Award No. cstc2021ycjh-bgzxm0132. The second author is funded by the Royal Academy of Engineering under the Research Fellowship Scheme.
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Received: Oct 25, 2021
Accepted: Mar 5, 2022
Published online: May 2, 2022
Published in print: Jul 1, 2022
Discussion open until: Oct 2, 2022
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