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建立了能够考虑路面、路基和地基相互作用的弹塑性有限元整体分析模型,通过路面结构在工后差异沉降下的力学响应分析,提出了高速公路双侧拓宽工程差异沉降控制标准,分析了差异沉降曲线形态、面层和基层厚度对差异沉降控制标准的影响。研究表明:差异沉降曲线呈马鞍形分布时,拓宽路基差异沉降控制标准为工后变坡率不超过0.3%;差异沉降曲线呈倒钟形分布时,拓宽路基差异沉降控制标准为工后变坡率不超过0.45%。差异沉降控制标准随面层或基层厚度的增加而减小,保持面层与基层厚度之和不变条件下增加面层或基层厚度,差异沉降控制标准数值不变。
The elasto-plastic finite element overall analysis model that can consider the interaction of pavement, subgrade and foundation is established. Based on the analysis of the mechanical response of the pavement structure under the differential settlement of the post-construction, the control criteria of widening differential settlement of engineering on both sides of expressway are proposed. Effect of Settlement Curve Morphology, Surface Layer and Basement Thickness on Control Standard of Differential Settlement. The results show that when the differential settlement curve is saddle-shaped, the control standard for widening subgrade differential settlement is that the post-construction slope-changing rate does not exceed 0.3%. When the differential settlement curve is in an inverted bell-shaped distribution, the control standard for widening subgrade differential settlement is post- The rate does not exceed 0.45%. The standard of differential settlement control decreases with the increase of the surface or grass-roots thickness, and increases the thickness of the surface or grass-roots under the condition that the sum of the surface and grass-roots thickness is the same, and the standard value of the differential settlement control remains unchanged.