›› 2009, Vol. 30 ›› Issue (S2): 224-228.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of silty clay dynamic characteristics in Chongqing downtown area

CAI Hui-teng, WEI Fu-quan, CAI Zong-wen   

  1. Fujan Provincial Earthquake Administration, Fuzhou 350003, China
  • Received:2009-07-18 Online:2009-08-10 Published:2011-06-21

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Abstract:

The testing results of dynamic shear modulus and damping ratio of silty clay in Chongqing downtown area are attained with the change of shear strain by natural (resonance) column test and dynamic triaxial test. Besides, the differences between test value and recommended value from Reference [1] and code value from Reference [2] are compared and analyzed. Furthermore, the influence of such difference on surface response spectrum is initially given through soil response calculation; and main conclusions are drawn as follows: (1) In Relation G/Gmax-γ, G/Gmax given by code value is lower than that of test value and recommended value during moderate strain; code value attenuates faster than test value and recommended value during large strain. (2) After Gmax normalization, relation G-γ bears more consistency than relation λ-γ; and damping discreteness of silty clay is relatively large. (3) The difference of surface response spectrum calculated by test value and recommended value is relatively small; while the difference calculated by test value and code value is relatively large. And such difference is more obvious with the increase of input ground motion strength. Analyses show that in the process of soil dynamic calculation in Chongqing downtown area without testing data of soil dynamic characteristics, the application of code value has certain limitation and risk; and to some degree recommended value bears more applicability than code value.

Key words: silty clay, dynamic shear modulus and damping ratio, test value, recommended value, code value

CLC Number: 

  • TU 443
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