Abstract: The use of aged steel slag as geotechnical backfill material is one of the main ways of recycling waste steel slag. According to the engineering classification method of soil, the waste steel slag is divided into gravel steel slag, coarse steel slag and fine steel slag. For the gravel steel slag, the dynamic triaxial tests were carried out by considering the influencing factors, such as consolidation stress ratios, vibration frequencies, confining pressures and gravel contents. The relationships between dynamic strength and vibration times, dynamic strain and vibration times, pore water pressure and vibration times, dynamic stress and dynamic strain of the gravel steel slag samples were analyzed. The calculation model of saturated sand dynamic pore pressure proposed by Seed and Finn was used to analyze the types of dynamic pore pressure curves of gravel steel slag. Compared with the anti-liquefaction strength of the traditional gravel soil, the anti-liquefaction characteristics of gravel steel slag are better. In the practical engineering, gravel steel slag can be used to replace traditional sand, gravel soil, sand gravel and sand pebbles as backfill materials, to solve the shortage problem of gravel resources.

Key words: gravel steel slag, anti-liquefaction characteristics, dynamic triaxial test, calculation model of dynamic pore pressure, anti-liquefaction strength, vibration times