Study on Coastal Sand Embankment Structural Strength Control
To maximize the coastal sand utilization,in accordance with the design requirements for embankment structural strength,this study investigated the coastal sand-filled embankment structural strength with edge wrapping and improved top layer by using the layered elastic system theory.The influences of sand core modulus,improved layer modulus,and improved layer thickness on embankment top surface modulus rebound were clarified.The design concepts and techniques for structural strength control were proposed.The laboratory and field test results show that the coastal sand CBR strength increases with the compaction.The compacted coastal sand meets the CBR value requirements for highway embankment fillers.However,due to the poor gradation and low cohesion of coastal sand,the pure coastal sand structure surface layer does not meet the rebound deflection requirements for embankment structures.Therefore,adopting an edge-wrapped and improved layer structure can fully utilize the material strength performance of coastal sand core,while satisfying the strength requirements of embankment rebound modulus.The result indicates that the equivalent rebound modulus of embankment top surface is significantly correlated with the sands'own rebound modulus,the improved layer's rebound modulus,and the improved layer thickness.Thus,the multivariate nonlinear regression empirical formula was established.The empirical solutions for embankment top surface equivalent rebound modulus closely align with the theoretical solutions of layered system structure.The introduction of empirical formula provides a precise and convenient calculation tool for material selection and thickness optimization of improvement layer,effectively achieving the reasonable control over embankment structural strength.This lays a reliable theoretical foundation for the extensive utilization of coastal sand in coastal highway construction,reducing construction costs,and protecting the ecological environment.
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