针对连续配筋混凝土复合式沥青路面(CRC+AC)结构的特点和现有研究的不足,运用传热学理论、力学理论和有限元法,计算和分析了层间剪应力的临界荷位和影响因素;通过室内试验和工程实践,研究了基于层间剪应力的层间结构和材料及CRC层表面处理技术。研究结果表明:层间抗剪强度不足会使CRC+AC结构层间出现纵向和侧向滑移;层间最大剪应力随AC层厚度和模量的增大而减小,且随AC层厚度增加而减小的趋势更为明显,CRC层厚度对层间最大剪应力的影响很小;通过计算分析并结合试验路修筑经验和检测结果,建议CRC4-AC结构AC层的厚度不宜小于6cm;建议采用喷洒式结构对CRC+AC结构的层间进行处理,并选用SBS改性沥青作为喷洒沥青,采用裸化技术对CRC层表面进行处理。研究结果可为刚柔复合式沥青路面的合理设计提供重要参考。
Focused pavement structure, on the characteristics and the flaws of existing studies of CRC + AC composite asphalt by using heat transfer theory, mechanics theory and finite element method, the critical load position and the influencing factors of the interlaminar shear stress were calculated and analyzed. The interlaminar structure and materials, and CRC layer surface treatment technology based on interlaminar shear stress were researched by indoor experiment and engineering practice. The results show that ( 1 ) longitudinal and lateral slips would occur in CRC + AC structure due to lacking of interlaminar shear strength ; (2) the interlaminar maximum shear stress decreases with the thickness and modulus of AC layer, and the decrease trend is more obvious with the increase of thickness of AC layer, the thickness of CRC layer has little effect on the interlaminar maximum shear stress. By analysis and calculating, and combined with measurment and construction cm, to use experience of test road, it the spraying type structure is recommended that the thickness of to treat the interlaminar of CRC + AC asphalt as spraying asphalt, and to use baring technique to treat the surface AC layer should not less than 6 structure, to use SBS modified of CRC layer. The results can provide an important reference for rational design of rigid-flexible composite asphalt pavement.