Experimental Study on Stiffness Degradation of Organic Matter-Disseminated Sand under Cyclic Loading

Juan Du (), Xingfei Jiang, Bingyang Liu, Lin Jia and Yang Zhang ()
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Juan Du: School of Civil Engineering and Architecture, Hainan University, Haikou 570228, China
Xingfei Jiang: School of Civil Engineering and Architecture, Hainan University, Haikou 570228, China
Bingyang Liu: School of Civil Engineering, Harbin Institute of Technology, Harbin 150006, China
Lin Jia: Hainan Investigation Institute of Hydrogeology and Engineering Geology, Haikou 570206, China
Yang Zhang: School of Civil Engineering and Architecture, Hainan University, Haikou 570228, China

Sustainability, 2022, vol. 14, issue 18, 1-15

Abstract: Degradation of stiffness will occur in sand under cyclic loading. Organic matter-disseminated sand (OMDS) is a special sand in the northeast and western coastal region of Hainan Island. Through the stress-controlled dynamic triaxial test, the natural moisture content, vibration amplitude and consolidation ratio of OMDS under three types of cyclic loads (sine wave, triangular wave and rectangular wave) were studied. The results showed that the soil stiffness decreases with the increase in vibration times. The increase in natural moisture content and vibration amplitude, and the reduction in the consolidation ratio accelerate the softening of soil stiffness. Furthermore, based on the test results, an empirical formula was derived to reflect the rule of soil stiffness softening.

Keywords: organic matter-disseminated sand (OMDS); dynamic deformation; stiffness degradation; softening index (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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