Closed-Form Solution for Cavity Expansion in Strain-Softening and Undrained Soil Mass Based on the Unified Strength Failure Criterion
Publication: International Journal of Geomechanics
Volume 17, Issue 9
Abstract
This paper presents a solution for cavity expansion in strain-softening and undrained soil mass based on the unified strength failure criterion. Stress distribution around the cavity expansion was divided into three regions (i.e., elastic, softening, and plastic flow zones). The deformation was assumed to be governed by the small strain in the elastic zone and the large strain in the softening and plastic flow zones, and a closed-form solution of the stress and strain was obtained for the different zones. Moreover, the softening zone radius, the excess pore-water pressure in the plastic flow zone, and the ultimate cavity expansion pressure were obtained for cavity expansion in the strain-softening soil mass by incorporating certain factors, such as large strain, drainage condition-, and intermediate principal stress. Furthermore, several cases were analyzed using the proposed approach. The results of the ultimate cavity expansion pressure (e.g., k = 1) were consistent with those obtained through previous theories and local tests.
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Acknowledgments
This work was supported by the National Basic Research Program of China (973 Project; Grant 2013CB036004) and the National Natural Science Foundation of China (Grant 51208523).
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Published In
International Journal of Geomechanics
Volume 17 • Issue 9 • September 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Feb 3, 2016
Accepted: Feb 2, 2017
Published online: Apr 28, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 28, 2017
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