基于有效模量的沥青路面加铺层设计方法

Design method of asphalt pavement's overlay based on valid modulus

中国沥青路面加铺设计方法单纯采用旧路面的弯沉作为设计指标,无法指导路面病害较为严重时所需要进行的路面加铺设计。参考AASHTO设计方法中旧沥青路面层系数的建议值,根据模量和层系数的关系,确定了半刚性基层沥青路面结构层的有效模量建议值,并结合中国沥青路面设计方法,提出基于结构层有效模量的半刚性基层沥青路面加铺层设计方法。通过沥青路面加铺设计实例,根据路面病害状况确定了各结构层的有效模量,得到加铺层厚度为10cm。结果表明:该方法设计结果与美国AI法结果基本一致,略低于AASHTO设计结果;避免了当路面代表弯沉值较小时,按现行规范无法进行加铺的情况。

The current overlay design method uses the deflection as the only design index in China, which can not meet the requirement of the asphalt pavements with serious diseases. According to the relationship between modulus and layer coefficient, the effective modulus suggested value of semi-rigid asphalt pavement layers was determined by referencing to the AASHTO＇s old asphalt surface layer coefficient. Combining with Chinese＇s overlay design method, a new overlay design method was set up based on the valid modulus of asphalt pavement. As an example the overlay on an actual asphalt pavement with diseases was designed by the new method, the valid modulus of pavement layers was determined, the overlay thickness was 10 cm which is basically equal to the AI method, and little thin than the one by the AASHTO method. The results indicate that the problem in current overlay design method can be avoid by using this method. 10 tabs, 1 fig, 9 refs.