Experimental and Estimation Studies of Resilient Modulus of Marine Coral Sand under Cyclic Loading

Abstract

Coral sand is an important filler resource that can solve the shortage of terrestrial fillers in coastal areas. Recently, the foundations of many infrastructures in the South China Sea have been built with coral sand as fillers, which have been subjected to wave and traffic cyclic loads. Resilient modulus (Mr) is an important design parameter in marine engineering, but there are few studies on the resilient modulus response of coral sand under cyclic loading. A series of drained cyclic triaxial tests were carried out to investigate the effects of the initial mean effective stress (p0) and cyclic stress ratio (ζ) on the resilient modulus response of the coral sand from the South China Sea. The change of fractal dimension (αc) can reflect the rule of particle breakage evolution. The αc of coral sand shows a tendency of almost maintaining stable and then increasing rapidly with the increase of mean effective stress p0 under each cyclic stress ratio ζ. There is a threshold of p0, when the p0 exceeds this threshold, αc will increase significantly with the increase of p0. The increase of p0 has a beneficial effect on the improvement of the Mr, while the increase of ζ has both beneficial and detrimental effects on the improvement of the Mr. A new prediction model of the Mr considering particle breakage was established, which can better predict the Mr of coral sand in the whole stress interval. The research results can provide guidance for the design of marine transportation infrastructures, which can promote the development of marine transportation industry and energy utilization.

Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand

“…In 1988, the first international calcareous soil mechanics conference held in Perth, Australia, triggered a great upsurge in research on the mechanical properties of coral sand. At present, researchers have mainly studied coral fine-grained soil [2,20,[22][23][24], medium-coarse sand [25][26][27][28][29][30][31], and coarse-grained soil [32,33]. There are relatively few studies on the mechanical properties of coral gravelly sand [34,35], and these research results are mostly limited to the effects of density, gradation, stress state, etc.…”

Cyclic Degradation Characteristics of Undisturbed Soft Clay considering Anisotropy

“…e consolidation is divided into two steps. First, the isotropic consolidation is performed, and then the deviator stress (q) is applied to perform the deviator stress consolidation [27,28].…”

Determining the Mineral Admixture and Fiber on Mechanics and Fracture Properties of Concrete under Sulfate Attack

“…Over the years, the development of marine energy has attracted more and more attention from coastal countries, and the construction of concrete structures in the coastal and offshore environment is increasing, which puts higher requirements on the durability and corrosion resistance of coastal concrete. Under the erosion of sea water, sulfate is the most destructive corrosive substance among various corrosive media [1][2][3][4].…”