机场复合道面关键力学响应研究

Study on Critical Mechanical Response of Airport Compound Pavement

基于Abaqus建立复合道面三维有限元模型,分析在B777机型荷载作用下,加铺层厚度、水泥混凝土板(PCC层)厚度、加铺层与混凝土的层间粘结、混凝土与基层的层间粘结及水平力对复合道面结构响应的影响。结果表明,沥青加铺层与PCC层的层间粘结对加铺层力学响应的影响起关键作用。此层间粘结的衰减会导致加铺层层底应变重分布。提高运营期内加铺层与PCC层的层间粘结是延长加铺层使用寿命更有效的途径。PCC层与基层的粘结对PCC层层底应力同样有重要的影响,但本文涉及的108种复合道面结构组合中PCC层层底拉应力数值均小于2.5 MPa,不会出现疲劳破坏。

The establishment of Abaqus composite pavement based on the 3D finite element model, analysis in B777 models under load, paving cement concrete plate thickness, layer （PCC layer）, influences of the thickness of the overlay and the concrete layer and concrete and bond between the base layer and bonding between horizontal force on the response of the composite road surface structure. The results show that the interlayer bonding between the asphalt overlay and the PCC layer plays a key role in the effect of the mechanical response of the overlay. The attenuation of the bonding between the layers leads to the redistribution of the strain at the bottom layer.Increasing the interlayer bonding between the overlay and the PCC layer in the operation period is a more effective way to prolong the service life of the overlay. The bonding between PCC layer and base layer has an important effect on the bottom stress of PCC, but the bottom tensile stress of PCC under 108 kinds of composite pavement structure combinations is less than 2.5 MPa, and there will be no fatigue damage.