钢桥面环氧沥青铺装层鼓泡形成扩展机理

为有效减少钢桥面环氧沥青铺装层出现鼓泡现象，采用现场调查、理论分析和数学建模的研究方法，系统地研究了鼓泡产生的原因和形成扩展机理。基于薄板理论，研究了鼓泡在竖向均布荷载作用下鼓泡挠度的变化规律。根据断裂力学中的能量原理，得到了鼓泡形成扩展过程中的能量关系，进而阐明了鼓泡形成扩展机理。研究结果表明：钢桥面环氧沥青铺装层鼓泡的形成扩展过程分为起裂、稳定扩展和失稳扩展3个阶段；鼓泡在外力作用下产生的挠度与鼓泡半径、铺装层厚度和弹性模量等因素有关，提出了以能量释放率为判定参数的扩展准则。

Initiation and Propagation Mechanism of Blisters on the Epoxy Asphalt Concrete Paving Course of Steel Deck Bridge Pavement

In order to take effective steps to minimize the blistering problems on the epoxy asphalt overlays, the cause and propagation mechanism for blisters were studied systematically by means of field investigation, theoretical analysis and mathematical modeling. Based on the theory of thin plate and fracture mechanics,the deflection of blisters was studied under the pressure. Additionally, the energy principle in fracture mechanics was used to derive the energy relationship and the initiation and propagation mechanism was studied. The results indicate that the development of blisters includes three stages, namely, initiation, stale and unstable propagation. The deflection of blisters produced by the external force was related to the radius of blisters, depth and modulus of elasticity of pavement. The energy release rate was proposed as a criterion of the initiation and propagation of blisters. It provides the theory basis for further model experiment and simulation analysis.