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天然地基的承载力对低填路基表面的弯沉值影响显著,掌握天然地基模量,预测路基表面的承载力,会降低路基表面弯沉不达标的风险。根据填土回弹模量、填土高度和天然地基回弹模量的变化,用弹性层状体系理论计算路基顶面弯沉值,建立低填路基承载力的预测模型,并通过与路基竣工验收弯沉值进行比较,判断低填路基的承载能力。结合原神高速公路,确定出了山西黄土地区低填路基的天然地基需要进行处治对应的临界填土高度。
The bearing capacity of natural foundation has a significant effect on the deflection of low embankment surface. Grasping the natural foundation modulus and predicting the bearing capacity of embankment surface will reduce the risk of subgrade deflection. According to the elastic modulus of fill, the height of fill and the change of natural foundation’s rebound modulus, the deflection value of subgrade surface is calculated by the theory of elastic layered system, and the prediction model of bearing capacity of low subgrade is established. Acceptance of deflection values were compared to determine the carrying capacity of low embankment. Combined with the original God Expressway, the critical fill height of the natural foundations of low fill roadbed in Shanxi loess area is determined.