Experimental Study on Improvement of Heavy-haul Railway Subgrade Filler

Based on static and dynamic triaxial tests, the effects of three reinforcement methods, including fiber improvement, curing agent improvement, and fiber - curing agent improvement, on the performance of heavy-haul railway subgrade filler were studied, and the best improvement scheme was proposed. The results show that when the curing agent content in the curing soil is 5%, the strength reaches the peak, and the longer the curing time, the higher the strength. With fiber improvement, when the fiber content is 0.2%, the soil static dynamic performance of fiber reaches the best; When the fiber length is 0~12 mm, the strength increases with the increase of fiber length, and when the length is 12~18 mm, the strength decreases with the increase of fiber length. The fiber-curing agent combined improvement scheme is the best reinforcement effect. It is recommended that the fiber-curing agent combined improvement scheme be used to enhance the mechanical properties of the subgrade filler, and the optimal curing agent content is 5%, fiber content is 0.2%, and fiber length is 12 mm.