Geomechanics and Engineering

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Spherical cavity expansion in overconsolidated unsaturated soil under constant suction condition

  • Wang, Hui (Department of Civil Engineering, Tongji University) ;
  • Yang, Changyi (Department of Civil Engineering, Tongji University) ;
  • Li, Jingpei (Department of Civil Engineering, Tongji University)
  • Received : 2021.08.07
  • Accepted : 2022.02.11
  • Published : 2022.04.10
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Abstract

A semi-analytical solution to responses of overconsolidated (OC) unsaturated soils surrounding an expanding spherical cavity under constant suction condition is presented. To capture the elastoplastic hydro-mechanical property of OC unsaturated soils, the unified hardening (UH) model for OC unsaturated soil is adopted in corporation with a soil-water characteristic curve (SWCC) and two suction yield surfaces. Taking the specific volume, radial stress, tangential stress and degree of saturation as the four basic unknowns, the problem investigated is formulated by solving a set of first-order ordinary differential equations with the help of an auxiliary variable and an iterative algorithm. The present solution is validated by comparing with available solution based on the modified Cam Clay (MCC) model. Parametric studies reveal that the hydraulic and mechanical responses of spherical cavity expanding in unsaturated soils are not only coupled, but also affected by suction and overconsolidation ratio (OCR) significantly. More importantly, whether hydraulic yield will occur or not depends only on the initial relationship between suction yield stress and suction. The presented solution can be used for calibration of some insitu tests in OC unsaturated soil.

Keywords

Acknowledgement

The authors are grateful for the financial support provided by the National Natural Science Foundation of China (Grant No. 41772290) for this research work.

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