Evolution Characteristics of Cracks in Compacted Loess under Drying-Wetting Cycles
To investigate the evolution of fractures in compacted loess under drying-wetting cycles,we conducted crack tests by varying the dry density and drying-wetting path using a self-developed device,and captured the sur-face crack patterns of soil samples.Furthermore,we quantitatively analyzed the soil cracks using PC AS software for morphological parameters and obtained strain fields via DIC(Digital Image Correlation)method.Our findings re-vealed three distinct stages in the development of compacted loess cracks with increasing drying-wetting cycles:ini-tial slow growth,subsequent rapid expansion,and stabilization.Crack development intensity was influenced by both dry density and drying-wetting cycle paths.Higher dry densities hindered crack propagation,while larger amplitude of drying-wetting and lower moisture thresholds cultivated crack development.Additionally,the first principal strain along the crack's central line exhibited a linear decrease with distance from the crack initiation point,indicating diminishing soil compression effects near the crack tip and adjacent blocks.These results provide insights into un-derstanding crack evolution in compacted loess.
compacted loessdrying-wetting cyclescrack propagationDICstrain field
万方数据
维普
