AUTHOR=Liu Haizhi , Huo Zhilei , Chen Danxi , Zhou Ruirong , Wu Qi 

TITLE=Experimental study of dynamic shear stiffness decay characteristics of interbedded soil: a case study in Yangtze River floodplain

JOURNAL=Frontiers in Earth Science

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1421253

DOI=10.3389/feart.2024.1421253

ISSN=2296-6463

ABSTRACT=<p>To explore the characteristics of the dynamic shear modulus of river-phase (as opposed to estuarine) floodplain interbedded soil, undisturbed interbedded soil from the floodplain of the Yangtze River in Nanjing was subjected to strain-controlled cyclic triaxial tests to investigate how the initial effective confining pressure (<italic>σʹ</italic><sub>m</sub>), consolidation ratio (<italic>k</italic><sub>c</sub>), and degree of consolidation (<italic>U</italic>) influence the maximum dynamic shear modulus <italic>G</italic><sub>max</sub> and the dynamic shear modulus ratio <italic>G</italic>/<italic>G</italic><sub>max</sub>. The results show that for this soil, <italic>G</italic> decreases with increasing strain amplitude, and for a given strain amplitude, <italic>G</italic> increases with increasing <italic>σʹ</italic><sub>m</sub>, <italic>k</italic><sub>c</sub>, and <italic>U</italic>. Compared with soil from the Yangtze estuary, <italic>k</italic><sub>c</sub> has a greater effect on <italic>G</italic><sub>max</sub> of the floodplain interbedded soil. Finally, a modified Martin-Davidenkov model is proposed for predicting <italic>G</italic>/<italic>G</italic><sub>max</sub> of river-phase floodplain interbedded soil under different <italic>σʹ</italic><sub>m</sub>, <italic>k</italic><sub>c</sub>, and <italic>U.</italic></p>