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重载条件下高性能RAP料柔性基层路面结构力学响应分析 预览 被引量:1

Mechanical Response of Pavement Structure of High-Performance RAP Material Flexible Base under the Condition of Overloading
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摘要 以308国道南宫至石邢界段改扩建项目为工程依托,分析了重载条件下高性能RAP料柔性基层路面结构的力学响应。采用ABAQUS软件对比分析了5种不同轴载等级作用下高性能RAP料柔型基层路面结构的弯沉、水平拉应变、旧路剩余基层层顶压应变及剪应力的特性分布和随轴载的变化规律。结果表明:路表弯沉沿X向呈W型分布,峰值出现在单轮中心;面层表面先产生压应变,随着深度的不断增加,逐渐转变为拉应变,且随着轴载的增加,压应变沿竖向方向有下移趋势;旧路剩余基层层顶压应变沿X向呈U型分布,峰值出现在轮迹中心位置;剪应力沿横向方向呈正弦分布,最大剪应力出现在轮迹边缘处,沿Y向出现在面层表面以下45 cm深度范围内;同一轴载作用下,高性能RAP料柔型基层路面结构的力学响应均小于级配碎石路面结构;随着轴载的增加,路面结构力学响应均随之增加,且高性能RAP料柔性基层路面结构力学响应的增加较慢。 Based on the reform and expansion project of 308 State Road from Nangong to Shixing,the mechanical response of pavement structure of high-performance RAP material flexible base under the condition of overloading was analyzed. The surface deflection, horizontal tension strain, the top compression strain of the remaining base layer of the old road and shearing stress of pavement structure of high-performance RAP material flexible base under five different load levels were comparatively analyzed by ABAQUS software, the distribution and the variation rule of them changing with load level were analyzed as well. The result shows that: the surface deflection distributes as a "W" in the X direction, and reaches its maximum value at the center of single wheel.With the gradual increase of depth, the surface layer is transformed into tensile strain from the pressure strain; and along with the increase of the axial load, the compression strain moves downward along the vertical direction;the top compression strain of the remaining base layer of the old road as a "U" in the X direction,and reaches its maximum value at the center of the wheel track; the shear stress shows a sine distribution in the transverse direction, reaches the maximum value at the edge of the wheel track and occurs in the range of 45cm depth below the surface of the surface layer in Y direction; under the same axle load, the mechanical response of pavement structure of highperformance RAP material flexible base is less than that of the graded crushed stone pavement structure.With the increase of axial load, both the mechanical responses of pavement structures increase, and the mechanical response of pavement structure of high-performance RAP material flexible base shows a slow increase.
作者 宋金华 张雪松 刘志蕾 姬玉平 倪东绪 SONG Jinhua,ZHANG Xuesong,LIU Zhilei,JI Yuping,NI Dongxu (School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401 ,P.R.China)
出处 《重庆交通大学学报:自然科学版》 北大核心 2017年第8期37-43,共7页 Journal of Chongqing Jiaotong University
关键词 道路工程 高性能RAP料 柔性基层 重载 力学响应 分布特性 highway engineering high-performance RAP material flexible base overloading mechanical response distribution features
作者简介 宋金华(1961-),男,河北衡水人,教授,主要从事路基路面结构方面的研究。E—mail:sjhua168@126.com
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