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为了研究应力吸收层模量变化对沥青加铺层结构内力的影响,探求应力吸收层合理的模量范围,采用三维有限元数值分析方法,建立基于Sampave应力吸收层的沥青加铺结构三维有限元模型,分析其模量变化对沥青加铺层结构荷载应力和温度应力分布的影响。结果表明:低模量的Sampave应力吸收层能有效地降低加铺层层底的荷载应力和温度应力,改善整个沥青面层结构的应力状态,延缓反射裂缝在加铺层中形成,显示其在抗反射裂缝方面的独特作用。但应力吸收层混合料模量不宜太大,在常温下,Sampave应力吸收层混合料模量在400—600 MPa较为合理。
In order to study the influence of the modulus change of the stress absorption layer on the internal force of the asphalt overlay structure and to explore the reasonable modulus range of the stress absorption layer, a three-dimensional finite element method based on Sampave stress- Model, the influence of its modulus change on the load stress and temperature stress distribution of asphalt overlay structure is analyzed. The results show that the low modulus Sampave stress absorption layer can effectively reduce the load stress and temperature stress of the overlay layer, improve the stress state of the entire asphalt surface structure, delay the formation of reflective cracks in the overlay layer, Anti-reflection cracks in the unique role. However, the modulus of the stress absorption layer mixture should not be too large, at room temperature, Sampave stress absorption layer mixture modulus 400-600 MPa is more reasonable.