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

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-29 DOI:10.3389/feart.2024.1421253

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

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引用次数: 0

Abstract

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 (σʹm), consolidation ratio (kc), and degree of consolidation (U) influence the maximum dynamic shear modulus Gmax and the dynamic shear modulus ratio G/Gmax. The results show that for this soil, G decreases with increasing strain amplitude, and for a given strain amplitude, G increases with increasing σʹm, kc, and U. Compared with soil from the Yangtze estuary, kc has a greater effect on Gmax of the floodplain interbedded soil. Finally, a modified Martin-Davidenkov model is proposed for predicting G/Gmax of river-phase floodplain interbedded soil under different σʹm, kc, and U.

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层间土的动剪切刚度衰减特性试验研究：以长江冲积平原为例

为探讨河相（相对于河口）洪积平原层间土的动剪模量特征，对南京长江洪积平原未扰动层间土进行了应变控制循环三轴试验，研究了初始有效约束压力（σʹm）、固结比（kc）和固结度（U）对最大动剪模量Gmax和动剪模量比G/Gmax的影响。结果表明，对于这种土壤，G 随应变振幅的增大而减小，在给定的应变振幅下，G 随 σʹm、kc 和 U 的增大而增大。最后，提出了一种改进的马丁-达维登科夫模型，用于预测不同σʹm、kc 和 U 条件下河漫滩层间土的 G/Gmax 值。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

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