Geomechanics and Engineering

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Undrained solution for cavity expansion in strength degradation and tresca soils

  • Li, Chao (School of Civil Engineering, Central South University) ;
  • Zou, Jin-feng (School of Civil Engineering, Central South University) ;
  • Sheng, Yu-ming (School of Civil Engineering, Central South University)
  • Received : 2019.05.05
  • Accepted : 2020.05.16
  • Published : 2020.06.25
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Abstract

An elastic-plastic solution for cavity expansion problem considering strength degradation, undrained condition and initial anisotropic in-situ stress is established based on the Tresca yield criterion and cavity expansion theory. Assumptions of large-strain for plastic region and small-strain for elastic region are adopted, respectively. The initial in-situ stress state of natural soil mass may be anisotropic caused by consolidation history, and the strength degradation of soil mass is caused by structural damage of soil mass in the process of loading analysis (cavity expansion process). Finally, the published solutions are conducted to verify the suitability of this elastic-plastic solution, and the parametric studies are investigated in order to the significance of this study for in-situ soil test.

Keywords

Acknowledgement

This work was supported by the National Key R&D Program of China (2017YFB1201204). The first author thanks Project 2018zzts188 supported by Innovation Foundation for Postgraduate of the Central South University. The editor's and anonymous reviewer's comments have improved the quality of the study and are also greatly acknowledged.

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