Water Infiltration and Water Stability of Compacted Loess Roadbeds Based on Vibration Compaction

In this work, the mechanical properties of compacted loess specimens formed using the vertical vibration compaction method (VVCM) were investigated, including unconfined compressive strength, CBR value, and shear strength. The top water seepage test and slope simulated rainfall test were implemented. In the test section, the water infiltration laws of compacted loess subgrades with different degrees of compaction were studied. Subsequently, the water stability of compacted loess subgrades was investigated. The results show that the loess specimens formed using the VVCM have adequate mechanical properties. Moreover, increasing the degree of compaction significantly improves the resistance of the loess roadbed to water infiltration and reduces both the water infiltration area and the corresponding water content. In addition, the seepage of the loess roadbed causes the roadbed to collapse, which affects the roadbed's stability. The high-compacted roadbed section exhibits improved resistance to collapse. Thus, improving roadbed compaction can effectively improve the roadbed's stability.