›› 2009, Vol. 30 ›› Issue (6): 1595-1598.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental research on ion effects of ultrafine granular clay seepage

GU Ren-guo1, 2，FANG Ying-guang1, 2   

  1. 1. School of Architecture and Civil Engineering, South China University of Technology, Guangzhou 510641, China; 2. State Key Laboratory of Subtropical Architecture Science, Guangzhou 510641, China
  • Received:2007-10-30 Online:2009-06-10 Published:2011-03-09
  • Supported by:

    谷任国，男，1979年生，博士，在站博士后，主要从事岩土及地下结构方面的研究。

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Abstract:

By using a conventional consolidation apparatus, seepage characteristics of ultrafine granular soil affected by ion concentration of pore solution are performed, and consolidation characteristics of four sets of bentonite samples of pore solutions with different contents of NaCl are tested under the same test condition. Consolidation curves and relevant consolidation coefficients are obtained; and seepage coefficients are obtained based on consolidation coefficients. The comparative analyses of hydraulic conductivity of samples of each group show that ion concentration is an important factor that influences on seepage. The hydraulic conductivity of soil increases as ion concentration increases. It is concluded that the change of the thickness of diffuse double layer on granular clay surface with ion concentration may be a key factor influencing on ion effects of granular soil seepage. The test results have contribution to understanding the origins of the ion effects on soil seepage, and are of guiding significance for improvement and perfection on existing seepage and consolidation theories of soil.

Key words: ultrafine granular clay, seepage, ion effect, experimental research

CLC Number: 

  • TU 411.99
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