水和超载对混凝土板沥青层间剪切疲劳寿命的影响

发布时间：2018-01-16 14:03

本文关键词：水和超载对混凝土板沥青层间剪切疲劳寿命的影响　出处：《中国公路学报》2017年04期 　论文类型：期刊论文

【摘要】：为弥补水泥混凝土板沥青铺装层间剪切疲劳寿命设计方法的不足,通过不同水环境、正压力条件下沥青混凝土及其与水泥混凝土板层间的抗剪强度和剪切疲劳试验,结合水泥混凝土板沥青铺装结构的三维有限元计算,探讨了水和超载对水泥混凝土板沥青铺装层间剪切疲劳寿命的影响。利用自行研制的可施加正压力的剪切试验仪,测试了2种水环境(无水和浸水)和3个正压力(0.3,0.5,0.7MPa)下沥青混凝土及其与水泥混凝土板层间抗剪强度,并进行了2种水环境、2个正压力(0.5,0.7 MPa)和4个剪切应力比(0.4,0.5,0.6,0.7)下沥青混凝土及其层间剪切疲劳试验。在此基础上,结合复合式路面结构的三维有限元计算,对比分析了不同水环境、垂直和水平荷载下沥青铺装层及其层间剪切疲劳寿命。研究结果表明:沥青混凝土和层间剪切疲劳寿命均与剪切应力比具有良好的双对数线性关系,剪切疲劳特性参数与材料特性、环境因素、交通荷载和沥青铺装结构等有关;层间抗剪强度和剪切疲劳寿命均低于沥青铺装材料的抗剪强度和剪切疲劳寿命,层间剪切破坏沿混凝土板表面发生;浸水导致层间剪切疲劳寿命降低85%以上,水平力和超压作用缩短层间剪切疲劳寿命45%以上,浸水比交通荷载的影响更大。
[Abstract]:In order to make up for the deficiency of the design method of shear fatigue life of cement concrete slab asphalt pavement, different water environment was adopted. Under normal pressure, the shear strength and shear fatigue test of asphalt concrete and cement concrete slab layer are carried out, and the three-dimensional finite element calculation of asphalt pavement structure of cement concrete slab is carried out. The influence of water and overload on the shear fatigue life of cement concrete slab asphalt pavement is discussed. The shear strength between asphalt concrete and cement concrete slab under two kinds of water environment (anhydrous and soaking) and three positive pressures of 0.3 ~ 0.5 ~ 0.7 MPa were measured and two kinds of water environment were carried out. The shear fatigue tests of asphalt concrete and its interlayer under two positive pressures (0.50.7MPa) and four shear stress ratios (0.4g / 0.50.60.70) have been carried out on this basis. Combined with the three-dimensional finite element calculation of composite pavement structure, the different water environment is compared and analyzed. The shear fatigue life of asphalt pavement and its interlayer under vertical and horizontal loads. The results show that both asphalt concrete and interlayer shear fatigue life have a good logarithmic linear relationship with shear stress ratio. The shear fatigue parameters are related to material properties, environmental factors, traffic loads and asphalt pavement structures. The interlaminar shear strength and shear fatigue life are lower than those of asphalt pavement, and the interlaminar shear failure occurs along the surface of concrete slab. The interlaminar shear fatigue life is reduced by more than 85% due to immersion, and the fatigue life of interlaminar shear fatigue is shortened by more than 45% due to horizontal force and overpressure, which is more important than traffic load.
【作者单位】：长沙理工大学道路结构与材料交通行业重点实验室;广西交通投资集团有限公司;江西省高速公路投资集团有限责任公司;
【基金】：国家自然科学基金项目(51378084) 江西交通科技计划项目(2011C0063) 广西交通科技计划项目(桂交科教发[2013]100号)
【分类号】：U416.2
【正文快照】： 0 引言现行《公路沥青路面设计规范》(JTG D50—2006)对水泥混凝土桥面、水泥混凝土路面板等沥青铺装层所形成的刚柔复合式路面结构提出了设计要求和方法,但近年随着交通量尤其是重型车辆的增加,这些复合式路面的沥青铺装层普遍出现了变形、推移、网裂、坑槽、剥落、横向裂

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