›› 2013, Vol. 34 ›› Issue (9): 2501-2507.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of permeability coefficient of natural saturated clay and its prediction model

LIU Wei-zheng1，SHI Ming-lei2，MIAO Lin-chang2   

  1. 1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. School of Transportation, Southeast University, Nanjing 210096, China
  • Received:2012-07-12 Online:2013-09-11 Published:2013-09-13

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Abstract: In order to explore the effect of physical properties, structural conditions and stress level on the permeability characteristics, consolidation-permeability tests are adopted to investigate the change of permeability coefficient during compression of Taihu swamp undisturbed silty clays and remolded samples experienced different preconsolidation pressures. The experimental results show that the permeability coefficient decreases nonlinearly with increasing consolidation pressure, and the relationship between void ratio and permeability coefficient of undisturbed specimen is almost identical to that of the remolded specimen, which is not influenced by the inter-particle cementation and stress history. For the same soil, the magnitude of permeability coefficient is mainly governed by the size of soil pore. Furthermore, according to the analysis results of the variation mode of permeability coefficient during compression tests in this work and related literatures, the linear lg(1+e)-lgkv permeability model is presented, and the empirical relationship of the permeability index is modified by considering the liquid limit. Using the modified expression, the calculation results of the permeability index agree well with the tested values. This study has important significance in accurately analyzing the nonlinear consolidation behavior of saturated clay foundation subjected to time-dependent loading.

Key words: saturated clay, permeability coefficient, soil structure, stress history, permeability index, liquid limit

CLC Number: 

  • TU 411
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