Research on the Technology of Reinforcing Soft Foundation with Modified Waste Soil Piles for Highways

In view of the current situation where a large quantity of waste soil from highway engineering is difficult to absorb on a large scale， this paper proposed a new type of modified waste soil precast pile based on a weak subgrade reinforcement project. It also conducted related research on the machinery for forming modified waste soil precast piles， the pile forming process， and the construction technology for reinforcing weak subgrads using these piles. The physical and mechanical properties of the waste soil in the field were obtained by laboratory tests， and the optimal cement content of the waste cohesive soil was determined. Based on the static load test results， the application effectiveness of modified waste soil precast piles in reinforcing weak subgrads was studied， and the load transfer characteristics of these piles were analyzed. By normalizing the field-measured data， a softening model of pile side friction resistance considering the interface bonding characteristics was proposed. The relevant research results provide new insights for the resource utilization of waste soil and reinforcement of weak subgrads.