轮载作用下典型沥青路面结构力学行为分析

发布时间：2019-03-30 20:07

【摘要】：为分析比较半刚性基层、倒装式和组合式3种典型沥青路面结构受轮载作用的力学行为,依托成德南高速公路沥青路面工程试验段,在与贝克曼梁路表静态弯沉测试值对比的基础上,开展了基于弹性层状体系理论的静力学分析.现场选取3个断面,通过预埋沥青应变计测试了不同轴重、不同车速条件下的车辆移动轮载动力响应.研究结果表明:沥青路面更易出现横向疲劳开裂;倒装式沥青路面面层层底行车方向及横断面方向拉应变峰值分别对应为组合式沥青路面的1.24倍和1.30倍,为半刚性基层沥青路面的2.37倍和2.67倍;路面结构厚度相同的情况下,半刚性基层沥青路面在减少沥青面层本身的疲劳开裂和永久变形方面优势较强,组合式沥青路面与半刚性基层沥青路面受力情况接近,可部分替代半刚性基层沥青路面;倒装式沥青路面轴重敏感度为3种路面结构中最小,但宜适当增加沥青面层或沥青稳定碎石基层厚度以改善其受力状况,并应严格控制沥青稳定碎石基层拉应力,以减少倒装式沥青路面和组合式沥青路面疲劳破坏.
[Abstract]:In order to analyze and compare the mechanical behavior of three typical asphalt pavement structures, semi-rigid base, inverted pavement and composite asphalt pavement subjected to wheel loading, the asphalt pavement engineering test section of Chengnan Expressway is used to analyze and compare the mechanical behavior of three typical asphalt pavement structures under wheel load. The static analysis based on the elastic layered system theory is carried out on the basis of the comparison with the measured values of the static deflection of the Bekman beam table. Three sections were selected to test the dynamic response of vehicle moving wheel load under different axle load and different speed by means of pre-buried asphalt strain gage. The results show that the asphalt pavement is more prone to transverse fatigue cracking. The peak values of bottom driving direction and cross section direction of inverted asphalt pavement are 1.24 times and 1.30 times of that of composite asphalt pavement respectively, and 2.37 times and 2.67 times of that of semi-rigid base asphalt pavement, respectively. When the pavement structure thickness is the same, the semi-rigid base asphalt pavement has a strong advantage in reducing fatigue cracking and permanent deformation of the asphalt surface itself, and the combined asphalt pavement is close to the semi-rigid base asphalt pavement under the stress condition. Can partly replace semi-rigid base asphalt pavement; The axial load sensitivity of flip-chip asphalt pavement is the least among the three pavement structures, but it is appropriate to increase the thickness of asphalt surface or asphalt stabilized macadam base to improve its stress condition, and the tensile stress of asphalt stabilized macadam base should be strictly controlled, and the tensile stress of asphalt stabilized macadam base should be controlled strictly. In order to reduce the fatigue damage of inverted asphalt pavement and composite asphalt pavement.
【作者单位】：西南交通大学土木工程学院;西南交通大学道路工程四川省重点实验室;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51378440) 国家973计划资助项目(2013CB036204) 中央高校基本科研业务费专项资金资助项目(SWJTU12CX067) 四川省教育厅科研资助项目(16ZB0013)
【分类号】：U416.217

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