摘要
为了合理评价温度对沥青路面结构的影响,考虑沥青路面温度沿深度方向的非均匀性分布和温度对沥青混凝土模量的影响,利用有限元法计算分析了不同面层初始裂缝深度和不同气温下的路面结构温度应力与应力强度因子变化情况。结果表明:面层表面开裂后,裂缝处的温度应力显著减小,面层底面的温度应力有所增大;裂缝初始深度越大,日平均温度越低,温差越大,面层底面的温度应力越大,裂缝处的应力强度因子也越大。在青藏公路沿线平均气温低、日温差大的条件下,一旦面层表面开裂,沥青路面结构将产生较大温度应力,导致裂缝快速向下扩展。
In order to reasonably evaluate the effect of temperature on asphalt pavement structure, the thermal stress and stress intensity factor of pavement structure under different surface initial cracks length and temperatures, were calculated and analyzed using the finite element method considering temperature heterogeneity in depth of asphalt pavement and influence of temperature on the elasticity modulus of asphalt concrete. The results indicate that the thermal stress in crack significantly reduces and the thermal stress on bottom of pavement surface increases while the surface has cracks. The deeper initial crack, the lower daily average temperature and the larger temperature difference, the thermal stress on bottom of pavement surface and the stress intensity factor in crack are greater. So, under the conditions of low daily average temperature and large temperature difference along Qinghai-Tibet highway, once asphalt-concrete surface has cracks, the larger thermal stress will appear in asphalt pavement structure, and cause crack rapidly ex- pand down. 2 tabs, 12 figs, 14 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第1期1-5,共5页
Journal of Chang’an University(Natural Science Edition)
基金
国家西部交通建设科技项目(200631800009)
西藏自治区交通科技项目(藏交建科合字[2007]1号)
关键词
道路工程
沥青路面
温度应力
非均匀性
初始裂缝
应力强度因子
road engineering
asphalt pavement
thermal stress
heterogeneity
initial cracking
stress intensity factor
