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将路面、路基和地基作为完整系统建立有限元整体分析模型,通过路面结构在差异沉降下的力学响应分析,建立了佛开高速公路单侧拓宽工程老路基施工期和拓宽路基工后差异沉降控制标准。有限元分析结果表明:施工期老路基差异沉降呈抛物线形分布,拓宽路基工后差异沉降呈“马鞍形”分布。可以取横向变坡率变化0.55%作为老路施工期差异沉降控制标准和拓宽路基工后差异沉降控制标准。
The pavement, subgrade and foundation are established as a complete system to establish a finite element overall analysis model. Based on the analysis of mechanical response of pavement structure under differential settlement, the construction period of unilateral widening project of old subgrade and the control of post-construction differential settlement of subgrade are established standard. The results of finite element analysis show that the differential settlement of old embankment during construction is parabolic, and the differential settlement after excavation is “saddle-shaped”. 0.55% change of lateral slope changing rate can be taken as the standard of differential settlement control of old road construction and widening differential settlement control standard of post-construction of roadbed.