›› 2011, Vol. 32 ›› Issue (10): 3136-3142.

• Geotechnical Engineering • Previous Articles     Next Articles

A method for predicting deformation caused by secondary consolidation for naturally sedimentary structural clays

ZENG Ling-ling1, 2, HONG Zhen-shun2, LIU Song-yu2, ZHANG Ding-wen2, DU Yan-jun2   

  1. 1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China; 2. Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 210096, China
  • Received:2010-12-12 Online:2011-10-10 Published:2011-10-13

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Abstract: It has been well documented that the mechanical behavior of naturally structured clays is different from that of remolded clays due to aging during depositional and post-depositional processes. However, the effect of soil structure on secondary consolidation is still seldom investigated. A series of oedometer and secondary consolidation tests were performed on both undisturbed and remolded samples of Lianyungang marine clay to investigate the secondary consolidation behavior. The results show that the secondary consolidation behavior changes dramatically in the vicinity of the consolidation yield stress. When the consolidation pressure is less than the consolidation yield stress, the creep can be neglected. However, the coefficient of secondary consolidation Cα, increases dramatically in the vicinity of the consolidation yield stress. Then, Cα decreases with the increase in consolidation stress. It is also found that the coefficient of secondary consolidation is a function of the ratio of t over tp and compression index. A method for calculating the secondary consolidation deformation is also proposed based on the above relationships. The data compiled from available literature were used to verify the effectiveness of the proposed method.

Key words: secondary consolidation, naturally sedimentary structural clays, consolidation yield stress, settlement calculation

CLC Number: 

  • TU 447
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