›› 2010, Vol. 31 ›› Issue (11): 3475-3480.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis of compressibility of structural soils based on disturbed state concept

LIU Wei-zheng，SHI Ming-lei，MIAO Lin-chang   

  1. School of Transportation, Southeast University, Nanjing 210096, China
  • Received:2010-04-09 Online:2010-11-10 Published:2010-11-24

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Abstract:

Due to the effect of soil structure, the structure of natural sedimentary clays was meta-stable and would damage during the process of post-yield compression deformation. First, a one-dimensional disturbed state concept (DSC) compression model of structured soils was established based on the disturbed state concept to characterize the compression destructural behavior of natural soils under loading. Additional void ratio ?e was employed as a structured state parameter reflecting the influence of soil structure; and quantitativel analysis was conducted on the relationship between additional void ratio and consolidation pressure. Compression destructive index b was used to describe the rate of destructuring in the DSC model. Then, one-dimensional compression tests were conducted on the Taihu Lake swamped natural soft clay, silty clay and stiff clay, and the results of the tests were simulated and analyzed using the DSC model. A procedure was suggested to determine parameters in the model. The results show that the proposed DSC model can be implemented to describe the compression behavior of natural soils with various structures. The DSC model reflected the nonlinearity of compression curve, which contribute to the accurate calculation in the nonlinear consolidation and settlement of structural soils.

Key words: soil structure, compressibility, additional void ratio, disturbed state concept, destructural index

CLC Number: 

  • TU 411
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