To investigate the formation of distinct crack patterns in cement-stabilized soil under varying temperatures, the Digital Image Correlation technique was employed to continuously measure strain fields on the surfaces of dried red clay and cement-stabilized soil samples exposed to different high-temperature conditions. Quantitative analysis was conducted to examine variations in crack morphology, focusing on moisture evaporation rates, crack propagation characteristics, strain field evolution, and surface crack ratios across temperature gradients. Additionally, scanning electron microscopy (SEM) images were used to reveal the mechanism by which temperature influences the crack resistance of cement-stabilized soil. The results indicate that under identical environmental conditions, the moisture evaporation rate of cement-stabilized soil is higher than that of red clay, while the crack ratio is relatively lower. At equivalent drying durations, stress concentration on the sample surface is more pronounced at lower temperatures. As the temperature increases, the extent of crack development on the surface of cement-stabilized soil also increases. During the drying process, soil shrinkage initiates at crack edges and propagates progressively across the entire sample, with elevated temperatures correlating to reduced maximum shrinkage strain. To optimize the crack resistance of cement-stabilized soil in construction applications, a curing temperature of approximately 35°C is recommended.

Sand soli liquefaction can significantly reduce the bearing capacity of foundations, posing risks to the structural integrity of buildings and infrastructure. In this study, free-field shaking table tests were conducted to evaluate the liquefaction behavior of regional sandy soils from island environments under various sand types and acceleration conditions. The liquefaction characteristics of the sandy soil were analyzed by integrating macroscopic phenomena, pore pressure measurements, and acceleration data obtained from the tests. The results indicate that under seismic excitation, both types of sandy soil foundations experience deformation and settlement while exhibiting liquefaction phenomena such as flow failure, sand spouting, and water gushing. The ratio of excess pore pressure is positively correlated with peak loading values, while liquefaction susceptibility decreases with greater burial depth. Notably, organic matter-disseminated sand demonstrates slower excess pore pressure dissipation and persistent residual pressures, whereas standard sand exhibits rapid and complete dissipation. Acceleration measurements reveal a bottom-to-top amplification effect within soil layers. The amplification coefficient for acceleration increases alongside higher peak loading values, demonstrating a more pronounced amplification effect in shallower soil layers. Additionally, the cyclic stress ratio (CSR) rises with increased loading intensity, and organic matter-disseminated sand presents a heightened risk of liquefaction under identical conditions. Significance analysis underscores that peak ground acceleration magnitude exerts a greater influence on liquefaction potential than burial depth.