Abstract： In the construction of secondary highways, the subgrade serves as the foundation of the pavement, and its construction quality directly affects the overall performance and service life of the highway. Currently, subgrade construction of secondary highways often faces various problems, such as improper foundation treatment, inadequate control of fill materials, insufficient compaction quality, and slope instability. If these issues are not effectively addressed, they will significantly impair the bearing capacity, stability, and durability of the highway. Therefore, systematically analyzing common problems in subgrade construction and proposing scientific and feasible quality control and technical countermeasures are of critical engineering practical value for improving the quality of secondary highways, ensuring driving safety, and extending the road's service life. This study aims to provide theoretical references and practical guidance for standardizing and refining subgrade construction of similar highways by examining typical problems in construction processes and exploring corresponding countermeasures.
王建光 Jianguang Wang (Wed,) studied this question.