›› 2006, Vol. 27 ›› Issue (8): 1235-1240.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Effects of shear strain rate on mechanical behavior of Zhanjiang strong structured clay

CAI Yu1, KONG Ling-wei1, GUO Ai-guo1, TUO Yong-fei2   

  1. 1. Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. The Second Harbor Engineering Investigation and Design Institute, China Transportation Engineering, Wuhan 430071, China
  • Received:2005-03-22 Online:2006-08-10 Published:2013-11-26

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Abstract: The effects of shearing strain rate on mechanical behavior of Zhanjiang strong structured clay have been investigated systematically by means of triaxial test. It is discovered that the strong structured clay has special mechanical effect of shearing strain rate; and the CU shear strength increases at first then decreases with the increase of strain rate, and a critical rate exists. The effect of strain rate on pore pressure is not so significant under the low confining pressure condition, whereas with the increase of confining pressure, the effect gradually becomes significant. Furthermore, the cohesion and internal friction angle entirely decreases and increases with the increase of strain rate, respectively, which show turning points when the strain rate increases to a certain value, but the latter lags behind to the former. The above-mentioned phenomena are resulted from the breakage behavior of clay structure related to the strong and weak structure of soil, which provides a help to understand the engineering properties of structured clay further.

Key words: structure of clay, shear strain rate, strength parameter

CLC Number: 

  • TU 411
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