In order to see the influence of the compaction degree and the moisture on the frost heaving properties of the gravel soil in the seasonally frozen region of Qinghai-Tibetan Plateau, and provide a foundation for the prevention and the control of the soil frost heaving, a series of frost-heaving ratio indoor tests with improved test devices are conducted to study the influence of the compaction degree, the initial moisture content and the water replenishing on the frost-heaving ratio. It is shown that, the frost-heaving ratio of the gravel soil decreases after the first increase with the increase of the compaction degree, with its maximum at the compaction degree of 95% under the closed condition and with the same initial moisture content, and it increases linearly with the increase of the initial moisture content under the closed condition and with the same compaction degree. There are highly related functional relationship between the compaction degree, the initial moisture content and the frost-heaving ratio, which can be used to forecast related indicators in some cases. The frost-heaving ratio increases over several times under the open condition than under the closed condition. It is necessary to reduce the underground water level, to set the water-resisting layer, and to strictly control the compaction degree and the initial moisture content for the effective prevention and control of the soil frost.

gravel soil  /  frost heaving  /  initial moisture content  /  compaction degree  /  water replenishing