层间接触状态对桥面铺装结构力学响应的影响

为解决混凝土桥桥面铺装结构设计时对调平层与沥青铺装层层间真实接触状态考虑不足的问题，采用理论推导和室内试验相结合的方法，应用层间接触系数来评价不同层间处治措施下的层间接触状态，同时采用ANSYS软件对不同接触条件下的力学响应进行分析.结果表明，植石措施下的层间接触系数值最大，为0.607，这与其表面构造深度大有关；部分连续层间接触状态下沥青铺装结构的受力状态明显较完全连续接触条件恶化，以拉毛措施下的沥青铺装层剪应力为例，XY向、YZ向剪应力最大值分别为0.412 MPa和0.421 MPa，较完全连续条件下的0.195 MPa和0.222 MPa分别增加了111%和91%，说明以完全连续层间接触条件进行铺装结构设计是不合理的；四种混凝土表面处治措施下，各铺装层所受最大应力变化不大，但与完全连续状态相比，沥青铺装层的受力状况明显恶化，说明在铺筑实体工程时要尽可能增强调平层与沥青铺装层的层间接触状态.
To solve the problem of insufficient consideration of interlayer contact state between leveling course and asphalt pavement, a new interlayer contact factor was adopted in this paper. Based on the semi-contacted bi-layer beam mechanical model, a calculation formula was derived, and the bending test on a bi-layer beam was designed to determine the interlayer contact factors under different concrete surface treatments and spraying volume of modified asphalt condition. Meanwhile, the mechanical responses were analyzed by using the analysis software ANSYS under different interlayer contact states. The results show that the interlayer contact state under artificial chiseling treatment is the best, and the maximum value of the interlayer contact factor is 0.607． The stress state of the asphalt pavement structure in the continuous layer contact state is obviously worse than that of the complete continuous contact condition. Taking the shear stress of asphalt pavement under cutting groove measure as an example, the maximum stresses in XY and YZ directions are 0.412 MPa and 0.421 MPa, while the stresses are 0.195MPa and 0.222 MPa under the complete continuous contact condition, and the former are larger than the latter by 111% and 91%, respectively. It shows that the complete continuous contact condition is not reasonable in the design of deck pavement structure． Compared with the fully continuous state, the stress state of asphalt pavement is obviously deteriorated, which indicates that the layer of the pavement layer and the layer of the asphalt overlay can be enhanced when the pavement is laid.