摘要
针对目前重载车辆、高性能材料和大厚度结构层的广泛应用,结合半刚性基层在使用过程易出现裂缝导致适应性受到质疑的现象,通过分析不同荷载和半刚性基层材料模量变化时的路面力学行为,研究路表弯沉、层底拉应力、拉应变和剪应力、剪应变的变化,提出了后续运营中当半刚性基层受损后,路面结构仍然保持稳定的基层模量范围,更接近路面实际情况,为设计时考虑基层受损状态而确定材料模量提供理论依据,增强了半刚性基层的适应性.分析结果表明：不同荷载作用下,若半刚性基层受损出现模量衰减,模量在1200~2000MPa之间,面层力学行为和底基层力学行为处于稳定状态;模量在1 200~1 600 MPa之间,半刚性基层即使受损也不会影响其正常使用,此时路面结构整体仍处于稳定状态.
According to the use of heavy vehicle, high performance materials and large thickness structure layer, the change of deflection on the surface, tensile stress, tensile strain, shear stress and shear strain are analyzed which is under different loads and modulus. Then the range of modulus of semi-rigid base is proposed under base damaged situation which is close to the actual situation and proves theoretical basis for semi-rigid base modulus under damages. It enhances the applicability of semi-rigid base in high grade pavement structure. The analysis results show that under different loads, if semi-rigid base appears modulus attenuation, the pavement and the subbase mechanical behavior is stable when semi-rigid base modulus is in the range of 1 200 - 2 000 MPa ; when semi-rigid base modulus is in the range of 1 200 - 1 600 MPa, the damages do not affect its use and the whole pavement structure is stable.
出处
《河北工业大学学报》
CAS
2016年第1期101-107,共7页
Journal of Hebei University of Technology
基金
国家自然科学基金(51208047,51208048,51408047)
国家西部交通建设项目(200631881218)
中国博士后科学基金(2013M532005,2015T81000)
中央高校基金科研业务专项资金资助项目(2014G2310020,31081151080)
青海省科技计划项目(2014-GX-A2A)
关键词
道路工程
沥青路面
半刚性基层
模量衰减
适应性
层底应力
剪应力
road engineering
asphalt pavement
semi-rigid base
modulus attenuation
adaptability
stress at layerbottom
shear stress
