›› 2011, Vol. 32 ›› Issue (1): 44-50.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of factors influencing expansive soil strength

XU Bin 1, 2，YIN Zong-ze 1, 2，LIU Shu-li3   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China; 3. Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 311231, China
  • Received:2010-03-15 Online:2011-01-10 Published:2011-01-19

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Abstract:

A series of tests were done to study the influences and variation of strength of a single kind of expansive soil in the process of changing the soil state from nature and unsaturated and no cracks to saturated and no cracks to saturated and cracks fully developed by shear test and triaxial test. Test results show that water content and density and cracks influence the expansive soil strength; and water content and cracks influenc strength more than density does. It is concluded that cracks should be considered within the method of determining expansive soil strength. It is suggested that the strength of sample after 5 cycles of wet-dry should be used as the strength of cracks fully developed expansive soil. By residual strength tests, a conclusion is drawn that the residual strength of expansive soil was in proximity to the strength of cracks fully developed expansive soil; as a result, the residual strength could be used approximately as the strength of expensive soil in the region of cracks developed.

Key words: expansive soil, cracks, wet-dry cycle, strength

CLC Number: 

  • TU 41
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