Mechanical Property Testing and Microscopic Mechanism Exploration of Solidified Soil Materials

The construction and development of urban rail transit and underground space produce a large amount of shield muck. However, the traditional muck treatment method brings great challenges to the ecological environment and resource protection. In view of this, the Recycled Solidified Soil-Engineering Residue (RSS-ER) prepared by combining cementitious materials with shield muck effectively solves this problem. Under the premise of ensuring that the water-solid ratio is 0.35, mineral powder, fly ash and silicon powder are selected for different orthogonal combinations, and the fluidity test, unconfined compressive strength test and microstructure test of RSS-ER with different mixing ratios are carried out. Research shows that fluidity of RSS can meet the requirements of filling materials in general backfill engineering; the unconfined compressive strength of RSS-ER is positively related to the curing time, and the strength of the specimen cured at room temperature is higher than that of specimens cured under water; the pores between the slag skeletons are filled with the hydration products C-S-H gel and C-A-S-H gel, which is the reason why the integrity and strength of RSS-ER are improved.