反射裂缝是隧道复合式路面结构的一大突出问题,严重影响路面使用性能.本文采用加纤改性沥青作为层间抗裂材料,成型了基层预设接缝的复合试件,基于室内弯曲试验和轮碾试验研究其层间抗裂性能,并通过有限元数值分析探究加纤改性沥青对复合式路面沥青面层应力分布情况的影响.结果表明:加纤改性沥青具有良好的层间抗裂性能,能够增强复合试件的抗弯曲能力,减缓反射裂缝的发展,延长复合试件疲劳寿命;有限元分析结果表明加纤改性沥青能够有效吸收沥青面层底部因基层接缝导致的集中应力,大大降低沥青面层底部的最大拉应力和最大剪应力.研究成果可为加纤改性沥青层间抗裂材料在隧道复合式路面中的应用与推广提供理论依据和技术支撑.
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.
谭剑;金瑞;陈钰;杨朝红;侯曙光
昭通市宜昭高速公路投资开发有限公司,云南 昭通 657000南京工业大学交通运输工程学院,江苏 南京 211800昭通市交通运输局,云南 昭通 657099
交通运输
隧道;复合式路面;反射裂缝;加纤改性沥青;抗裂性能;有限元分析
tunnel;composite pavement;reflective cracks;fiber-modified asphalt;crack resistance;finite element analysis
《南京工业大学学报（自然科学版）》 2024 (003)
330-337 / 8
云南省交通运输厅科技创新示范项目(2021-59)
10.3969/j.issn.1671-7627.2024.03.010
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