Experimental Study on the Effect of Freeze—Thaw Cycles on the Mineral Particle Fragmentation and Aggregation with Different Soil Types

The freeze–thaw cycle can change the size and shape of soil particles, that is, cause fragmentation aggregation mineral thereby affecting structure, which, in turn, affects properties. In addition, process aggregation, as an event closely related to cold climate, plays irreplaceable role reconstructing climatic conditions a certain area period time has important referential significance for restoration historical permafrost boundaries study climate change. Therefore, order better effect cycles on four specimens were selected this study; tests carried out 0, 3, 6, 9, 50, 100 times, respectively, test results analyzed. these experiments indicate (1) after cycles, changes grain-size distribution are different various types, mainly concentrated 0.001–0.1 mm; (2) coarse particle particles (sand, silt) be fragmented into relatively fine-grained (silt, clay). (clay) cannot undergo fragmentation, decrease clay is due its aggregation; (3) with increase fraction trend parallel x-axis, which means state equilibrium or balance; (4) Kvar value indicates distribution, particles. After 100th cycle, <0.1, belongs low-intensity area; (5) will type soil, specimen (H) from silty loam clay; (6) during process, types have situations fragmentation.