碎石化的旧水泥路面上水泥混凝土加铺层应力强度因子分析

Analysis on Stress Intensity Factor of Cement Concrete Overlay on Existing Rubblized Cement Pavement

碎石化后加铺水泥混凝土层是旧水泥混凝土路面一种旧路改建方式,反射裂缝是其病害形式之一。为了预估水泥混凝土加铺层的反射裂缝,分析碎石化技术是否对水泥混凝土加铺层有减缓反射裂缝发生的效果,采用ABAQUS有限元软件对旧水泥路面上水泥混凝土加铺层的应力强度因子进行分析。对比碎石化水泥混凝土面层和直接加铺水泥混凝土面层两种路面结构的应力强度因子,研究了碎石化的旧水泥混凝土路面上水泥混凝土加铺层的断裂破坏机理。结果表明,对旧水泥混凝土路面碎石化可以降低反射裂缝发展速度或推迟反射裂缝产生时间,从而延长路面使用寿命。

The cement concrete overlay after rubblized is a reconstruction method for the existing cement concrete pavement. The reflective crack is one of its defect types. In order to estimate the reflective crack of cement concrete overlay, the article analyzes whether or not the effect of rubblization technology to reduce the reflective crack of cement concrete overlay, and analyzes the stress intensity factor of cement concrete overlay on the existing cement pavement by ABAQUS finite element software. The article studies the fracture mechanism of cement concrete overlay on existing cement concrete pavement after rubblized. The result shows that the rebblization for the existing cement concrete pavement can reduce the development speed of reflective crack or delay the causing time of reflective crack so as to lengthen the service life of pavement.