CRC+AC复合式路面层间剪应力分析研究

Analysis Research on Inter-Layer Shear Stress of CRC+AC Composite Pavement

基于弹性层状体系理论,采用BISAR软件对连续配筋混凝土复合式沥青路面结构层间剪应力分布进行分析.结果表明,CRC+AC复合式路面层间最容易发生剪切破坏的点坐标为1.1δ与1.5δ标准轴载当量圆半经;AC面层模量对层间剪应力影响不明显,而当超载达到200%时,层间剪应力将增加74.5%,更容易导致CRC+AC复合式路面发生剪切破坏;AC+CRC层间结合状况对于最大剪应力有显著影响,随着层间结合状态变差,层间抗剪强度迅速降低;剪切试验的结果表明,层间采用SBS改性沥青+土工布的形式抗剪性能较好,建议工程实践中优先选用.

Based on the theory of elastic layered system, this paper analyzes the distribution of inter-layer shear stress of continuously reinforced concrete with asphalt concrete overly composite pavement using BIS- RA software. Results of the analysis indicate that positions where shear failure is most likely to occur are 1.1 and 1.5 radius of standard axle load equivalent circle. The modulus of AC layer has little effect on interface layer shear stress. However, when the overload is 200M, the shear stress may increase by 74.5%, resulting in shear failure of CRC＋AC pavement. The inter-layer conditions have significant effect on the maximum shear stress. When the inter-layer conditions worsen, the inter-layer shear stress decreases rapidly. Results of shear tests indicate that the use of SBS modified asphalt with geotextile between the CRC and AC layers may improve the inter-layer shear resistance, which is highly recommended.