A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effects of consolidation conditions on the dynamic shear modulus of saturated coral sand over a wide strain range
Abstract The utilization of coral sand as a construction material for ports and other infrastructure systems in coral reefs is prevalent, wherein the soil elements within slopes and embankments typically experience an anisotropic stress state. It is imperative to accurately characterize the degradation behavior of the stratigraphic material's stiffness across a wide range of strains. In this study, the maximum and strain-dependent shear modulus (G 0 and G) characteristics of saturated coral sand under isotropic and anisotropic consolidations were investigated by performing multi-stage stress-controlled undrained cyclic torsional shear tests with cyclic hollow cylinder shear apparatus. The experimental results indicated that G 0 and G generally rose with increasing initial effective consolidation pressure but decreased with increasing inclination of initial major principal stress from the vertical (α c). In contrast, the effect of consolidation stress ratio (k c) on G 0 and G was nonmonotonic, and that of k c and α c on the strain-dependent shear modulus reduction (G/G 0) curve was slight. By defining anisotropic consolidation indexes δ 0 and δ r used for quantifying the effect of consolidation-induced anisotropy on the G 0 and the G/G 0, respectively. A unified formula of G 0 obtained by multiplying Hardin's model by δ 0, as well as a unique formula of G/G 0 obtained by correcting γ r in the Davidenkov skeleton curve expression as a linear function of δ r were established under various consolidation conditions, respectively. The proposed G formula over a wide strain range is well validated by the experimental data for siliceous sandy soils from the literature.
Highlights New insights are provided into the G characteristics of anisotropically consolidated coral sand over a wide strain range. A unified formula for G 0 was established under various consolidation conditions by defining index δ 0. A unique formula of G/G 0 reduction was established under various consolidation conditions by defining index δ r.
Effects of consolidation conditions on the dynamic shear modulus of saturated coral sand over a wide strain range
Abstract The utilization of coral sand as a construction material for ports and other infrastructure systems in coral reefs is prevalent, wherein the soil elements within slopes and embankments typically experience an anisotropic stress state. It is imperative to accurately characterize the degradation behavior of the stratigraphic material's stiffness across a wide range of strains. In this study, the maximum and strain-dependent shear modulus (G 0 and G) characteristics of saturated coral sand under isotropic and anisotropic consolidations were investigated by performing multi-stage stress-controlled undrained cyclic torsional shear tests with cyclic hollow cylinder shear apparatus. The experimental results indicated that G 0 and G generally rose with increasing initial effective consolidation pressure but decreased with increasing inclination of initial major principal stress from the vertical (α c). In contrast, the effect of consolidation stress ratio (k c) on G 0 and G was nonmonotonic, and that of k c and α c on the strain-dependent shear modulus reduction (G/G 0) curve was slight. By defining anisotropic consolidation indexes δ 0 and δ r used for quantifying the effect of consolidation-induced anisotropy on the G 0 and the G/G 0, respectively. A unified formula of G 0 obtained by multiplying Hardin's model by δ 0, as well as a unique formula of G/G 0 obtained by correcting γ r in the Davidenkov skeleton curve expression as a linear function of δ r were established under various consolidation conditions, respectively. The proposed G formula over a wide strain range is well validated by the experimental data for siliceous sandy soils from the literature.
Highlights New insights are provided into the G characteristics of anisotropically consolidated coral sand over a wide strain range. A unified formula for G 0 was established under various consolidation conditions by defining index δ 0. A unique formula of G/G 0 reduction was established under various consolidation conditions by defining index δ r.
Effects of consolidation conditions on the dynamic shear modulus of saturated coral sand over a wide strain range
Qin, You (author) / Ma, Weijia (author) / Xu, Zihao (author) / Chen, Guoxing (author) / Zhao, Kai (author) / Wu, Qi (author)
Engineering Geology ; 324
2023-08-18
Article (Journal)
Electronic Resource
English
Shear Modulus and Damping Ratio of Sand–Gravel Mixtures Over a Wide Strain Range
| Taylor & Francis Verlag | 2019
| DOAJ | 2024
Small-Strain Shear Modulus of Coral Sand with Various Particle Size Distribution Curves
| British Library Conference Proceedings | 2022