隧道复合式路面层间抗裂性能研究OA北大核心CHSSCDCSTPCD

Reflective cracking is a significant issue in tunnel composite pavement structures,severely compromising pavement performance.This study utilized fiber-modified asphalt as an interlayer crack resistance material and formed composite specimens with predetermined base joints.Through indoor bending tests and wheel rolling tests,the interlayer anti-cracking performance of the tunnel composite pavement was investigated.Moreover,the influence of the asphalt on stress distribution in the surface layer of the composite pavement was explored using finite element method.The results demonstrated that fiber-modified asphalt exhibited excellent interlayer crack resistance,enhancing the bending resistance of the composite specimens.It also mitigated the progression of reflective cracks and prolonged the fatigue life of the specimens.Additionally,finite element analysis results revealed that fiber-modified asphalt effectively absorbed concentrated stress caused by base joints at the bottom of the asphalt surface layer,significantly reducing its maximum tensile and shear stress.These research findings offer valuable theoretical insights and technical support for the application and promotion of fiber-modified asphalt as an interlayer crack resistance material in tunnel composite pavement.