›› 2009, Vol. 30 ›› Issue (4): 926-932.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of dynamic behavior and equivalent viscoelastic model of unsaturated clay

WANG Meng 1,2，YANG Qing 1,2，NIE Ying 1,2，ZHANG Xiao-ling 1,2   

  1. 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2. Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2007-12-28 Online:2009-04-10 Published:2011-01-30

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Abstract:

The improved static and dynamic universal triaxial and torsional shear apparatus for unsaturated soil is employed to perform step stress controlled cyclic triaxial tests under consolidated drained condition. Through a series of tests on unsaturated remoulded clay, the effects of initial confining pressure and matric suction (pore air pressure Ua pore water pressure Uw) on stress-strain behavior are examined. The equivalent viscoelastic model of unsaturated clay considering the influence of matric suction is recommended by improving the Hardin-Drnerich equivalent viscoelastic model and Masing loading and unloading criterion of saturated soil. Moreover, it is verified through comparing experimental data and former improved model that the recommended equivalent viscoelastic model of unsaturated clay can be used to predict the stress-strain behavior of unsaturated soil.

Key words: unsaturated soil, matric suction, cyclic loading, viscoelastic model, dynamic triaxial

CLC Number: 

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