›› 2009, Vol. 30 ›› Issue (9): 2605-2608.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Simplified method for determining shear strength of unsaturated soils based on different paths

YAO Pan-feng1, QI Sheng-wen2, ZHANG Ming3   

  1. 1. MCC Capital Engineering & Research Incorporation Ltd., Beijing 100053, China; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. School of Civil and Hydraulic Engineering, Tsinghua University, Beijing 100084, China
  • Received:2008-04-29 Online:2009-09-10 Published:2010-03-24

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Abstract:

Shear strength is a basic issue for unsaturated soil; and how to quickly and economically determine the unsaturated soil shear strength index is an important issue for the implementation of unsaturated soil mechanics into engineering. The cohesion and the internal friction angle are functions of water content index; cohesion-degree of saturation curve (CDSC) and internal friction angle-degree of saturation curve (IFADSC) are gotten by simulating shear experiment through different paths, through which shear strength parameters can be obtained; CDSC and IFADSC are approximating straight lines in the same path when the change of saturation degree is small. A simplified method which provides advantages for applying soil mechanics theory of unsaturated soil to practical engineering is suggested to get the parameters through simulating different paths of shear strength experiments.

Key words: unsaturated soil, shear strength, path, cohesion-degree of saturation curve, internal friction angle-degree of saturation curve

CLC Number: 

  • TU 411.3
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