Experiments and Modeling of the Attenuation of the Dynamic Elastic Modulus of Saturated Red Clay under Cyclic Loading

Hongyan Ma, Yuanlong Zhuang, Liangliang Chen, Mengxi Lv and Song Xu ()
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Hongyan Ma: College of Civil Engineering, Fuzhou University, Fuzhou 350116, China
Yuanlong Zhuang: College of Civil Engineering, Xiamen University Tan Kah Kee College, Zhangzhou 363105, China
Liangliang Chen: National Engineering Laboratory for Surface Transportation Weather Impacts Prevention, Broadvision Engineering Consultants, Kunming 650041, China
Mengxi Lv: College of Civil Engineering, Fuzhou University, Fuzhou 350116, China
Song Xu: College of Civil Engineering, Fuzhou University, Fuzhou 350116, China

Sustainability, 2022, vol. 15, issue 1, 1-15

Abstract: Due to the long-term effect of cyclic traffic loads, the accumulated deformation of red clay subgrades is increasing, strength is decreasing, and problems such as uneven settlement are occurring. In order to improve the stability and durability of red clay subgrade, this paper analyzes the effects of cyclic stress ratios and compactness on the development of the dynamic elastic modulus of saturated red clay. This is achieved through dynamic triaxial tests on red clay in the Qingyuan County, Zhejiang Province, China. The results show that the saturated red clay has an attenuation threshold cyclic stress ratio under cyclic loading. The attenuation threshold cyclic stress ratio prediction models were constructed based on the confining pressure and compactness, respectively. By introducing the concept of a relative cyclic stress ratio, the prediction model of the dynamic elastic modulus of saturated red clay (as based on cyclic vibration times and close cyclic stress ratio) is constructed. The model realizes the prediction of the dynamic elastic modulus of red clay under arbitrary cyclic vibration times via the initial cyclic stress ratio, compactness, and other parameters. It provides a theoretical basis for rationally evaluating the dynamic stability of red clay subgrade under cyclic loading.

Keywords: subgrade engineering; red clay; dynamic triaxial test; dynamic elastic modulus; prediction model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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