Abstract: The soil arching is the result of selfoptimization and adjustment of the forces after deformation of rock and soil mass. The soil arching concept is widely used in various projects. The current researches on the soil aching are focused on the mechanical properties geotechnical materials, such as, cohesion and internal friction angle by the moisture content on the evolution of the soil arching effect. The model studies that the evolution of the soil arching can be divided into four stages: Initial Arching, Critical Arching, Failing Arching and Failed Arching. The moisture contents at each stage of the arching are studied. The test results indicate that the moisture content plays an important role in the soil arching effect in the sandy soils. When the moisture content in sand in small, the arching effect can be ignored.

Key words: Soil Aching, Sandy Soils, Evolution Stages, Moisture Contents