The effect of capillary water caused by heavy rainfall and groundwater level fluctuations can induce the erosion collapse island reef coral sand foundations. Here, effects content (ω) on shear strength parameters gravelly are analyzed at macro micro scales laboratory consolidated-drained triaxial compression nuclear magnetic resonance tests. Furthermore, particle breakage characteristics under static load discussed. With increasing ω, (1) internal friction angle increases slightly (<1°)...

Coral sand is the main filling material for island–reef foundation. Under tidal actions, saturation (Sr) of coral layers varies with specific depths in reclaimed Studying Sr effect sand’s mechanical behaviors crucial stability foundation island–reefs. In this study, a “quantitative injection method” was designed to prepare ranging from 90% 100%, and unconsolidated–undrained (UU) triaxial shear tests were conducted on under different effective confining pressures (σ3′). The results indicated...

Investigating the soil-water characteristics of calcareous soil has a great significance for preventing geological disasters on island-reefs as well maintaining foundation stability hydraulic-filled island-reefs. In this study, silty sands with different fines contents and dry densities were studied to reveal their effects The characteristic curve (SWCC) sand was measured using pressure plate apparatus. Taking into account porous meso-structure, content density SWCC analyzed, applicability...

Abstract The particle breakage of calcareous sands plays a key role in determining the shape and shear strength. This process has been analysed current study by employing ring tests on sampled from South China Sea. In this study, set parameters, e.g. roundness aspect ratio, have employed to quantify geometrical properties pre- after breakage. These two parameters found correlate well with vertical loading stress level, strain leads change micro-structure during test, as illustrated Scanning...

Calcareous sand is widely observed in the foundation of off-shore infrastructure. Although a lot research has been carried out on mechanical properties calcareous sand, study into influence stress–strain path behaviour very limited. In this study, series triaxial tests were performed under three different stress paths. The particle morphology before and after tests, relationship paths, characteristics shear strength deformation investigated. results show that consolidation pressure have...

The study of the mesostructure soil under loading is basis for understanding its macromechanical properties and establishing constitutive model. In this study, a series shear tests was performed on dry calcareous sand constant normal stress by modified direct apparatus. Digital images sample at different stages are obtained. mesostructural parameters then extracted analyzed using an image analysis technique. results show that shear‐band located junction upper lower boxes with thickness...

Coral sand is one kind of the important building materials in coral reef engineering practice. The use cement as a stabilizing agent can significantly improve mechanical properties sands and widely applied subbase construction islands. Cement-stabilized structures may contain high contents fine particles salinity because crushability existence seawater surrounding them. In this study, effects powders on dynamic cemented (CCS) were investigated through split Hopkinson pressure bar (SHPB)...

Calcareous sand has the characteristics of irregular shape, abundant internal voids and low particle strength. is widely used in cement mortar as substitute silicon sand. Due to inherent properties calcareous sand, dynamic behavior cemented (CCS) would differ from that In this study, a series split Hopkinson pressure bar (SHPB) tests were conducted investigate effect size distribution pattern on CCS. The results indicated stress strain CCS followed an elastoplastic deformation model....

In offshore area, newly deposited Quaternary loose seabed soils are widely distributed. There a great number of structures has been built on them in the past, or will be future due to fact that there would no very dense soil foundation could chosen at planed sites sometimes. However, loosely bring risk service ability after construction. Currently, understanding wave-induced liquefaction mechanism greatly improved; however, recognition consolidation characteristics and settlement estimation...

The reclamation coral sand (CS) layer is the survival environment for island reef vegetation in South China Sea. root system within CS bed draws water necessary growth, implying that water-retention capacity of plays a pivotal role determining viability. Particle size distribution (PSD) significantly influences geomaterials. This study examines impact PSD on from both macro (soil–water characteristic curve, SWCC) and micro (pore distribution) perspectives using pressure plate test nuclear...