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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CRC+AC结构AC层的厚度不宜小于6 cm;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。
In view of the characteristics of CRC + AC continuous concrete reinforced asphalt pavement structure and the shortcomings of existing researches, the critical charge levels of interlaminar shear stress and the finite element method are calculated and analyzed by using heat transfer theory, mechanics theory and finite element method. Influencing factors are discussed. The interlaminar structure and materials based on interlaminar shear stress and the surface treatment technology of CRC layer are studied through laboratory experiments and engineering practice. The results show that the insufficient shear strength between layers can cause longitudinal and lateral slip between the CRC + AC structures. The maximum shear stress decreases with the increase of AC thickness and modulus, The influence of CRC layer thickness on the maximum shear stress is negligible. Based on the calculation and analysis, combined with the experience and test results of the test road, it is suggested that the thickness of AC layer in CRC + AC structure should not be less than 6 cm ; It is suggested to adopt the spraying structure to process the interlayer of CRC + AC structure and to use SBS modified asphalt as sprayed asphalt, and the surface of CRC layer should be treated with the naked technology. The results can provide an important reference for the rational design of rigid-flexible composite asphalt pavement.