Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (S1): 163-172.doi: 10.16285/j.rsm.2022.0124

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Dynamic shear modulus and damping ratio characteristics of clayey and silt soils in Xuzhou urban area

CHEN Guo-xing1, 2, HAN Yong1, LIANG Ke3   

  1. 1. Institute of Geotechnical Engineering, Nanjing Tech. University, Nanjing, Jiangsu, 210009, China; 2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China; 3. Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China
  • Received:2022-01-23 Accepted:2022-04-19 Online:2023-11-16 Published:2023-11-16
  • Supported by:
    This work was supported by the National Key R&D Project of China (2018YFC1504301).

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Abstract:

Using the self-vibration column apparatus, the experimental investigation on the 165 undisturbed clayey and silt soil samples obtained from 41 boreholes in Xuzhou urban area were conducted to evaluate the characteristics of dynamic shear modulus ratio G/G0 and damping ratio l with the shear strain amplitude γa . Special focus is given to the influence of effective confining pressure, plasticity index, and geological age on the G/G0-γa  and λ-γa  curves of Q3 and Q4 clay soils, Q4 silty clay soil and Q4 silt soil. The results indicate that the larger the effective confining pressure is, the larger the plasticity index is, the newer the geological age is when the depth is similar, and the weaker the nonlinearity of soils is. The upper and lower envelopes of the G/G0-γa  and λ-γa  test data of three soils were proposed. The influence characteristics of soil type, effective confining pressure, plasticity index, and geological age on the G/G0-γa  and λ-γa  curves of three soils were quantitatively analyzed, and the corresponding empirical formulas for predicting G/G0-γa  and λ-γa  curves were established. The results are beneficial to understand the dynamic characteristics of various soils in Xuzhou urban area, and have a helpful reference for the evaluation of seismic site effects in this area.

Key words: soil dynamic characteristics, dynamic shear modulus, damping ratio, empirical formula

CLC Number: 

  • TU 411
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