Study on the Engineering Characteristics of Alluvial Silty Sand Embankment Under Vehicle Loads

This article takes alluvial silty sand in the alluvial plain area as the research object. Through a combination of theoretical analysis, finite element simulation, and on-site testing, the engineering characteristics of alluvial silty sand under traffic loads, as well as the feasibility of using alluvial silty sand as roadbed filling material in practical engineering, are systematically expounded on for the first time. The research results indicate that the influence of vehicle speed on the distribution and depth of dynamic stress is relatively small, while the moisture content (optimal 7.8%) and compaction degree (>94%) are the key factors determining the performance of the roadbed. Specifically, the displacement at the top of the roadbed varies with changes in moisture content. An increase in compaction degree is beneficial for reducing settlement and enhancing the stability of the roadbed. Through comparative analysis of finite element simulation and on-site testing, it was found that although the initial settlement of alluvial silt filling is large, the settlement rate is fast and can stabilize in a short period of time. Its long-term performance can still meet engineering requirements. Research has shown that alluvial silt can be used as an economical and reasonable roadbed filling material, but in practical applications, strict control of moisture content and compaction degree is required to optimize roadbed performance.