摘要
本文考虑了沥青混合料的粘弹性,基于断裂力学理论,通过有限元数值模拟研究了含多裂纹沥青路面在温度荷载作用下的响应,考察了裂纹间距变化对应力强度因子以及温度应力的影响,结果表明:随着温度降低,基底裂缝的I型应力强度因子逐渐增大;随着裂纹间距的增大,基底裂纹先增大后减小并趋于稳定,表面裂纹尖端的最大压应力亦呈现先增大后减小的趋势,同时对加铺土工布这一阻裂措施利用数值模拟进行了验证。
Based on the theory of viscoelasticity and fracture mechanics, the thermal response of the asphalt pavement with several cracks under temperature load is discussed in this paper by FEM simulation. The effects of crack spacing on the stress intensity factors and the stress of the crack tip are analyzed. The numerical resuits show that the type I stress intensity factor of the base bottom crack increases with the temperature de- crease. As the crack spacing increases, the type I stress intensity factor of the base bottom crack and the stress on the tip of the top-down crack first are increased and then decreased. The effectiveness of using geotextiles for anti-cracking is confirmed by the numerical results.
出处
《华中科技大学学报（城市科学版）》
CAS
2010年第3期16-20,共5页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金(50808090)
关键词
沥青路面
多裂纹
粘弹性
应力强度因子
温度应力
asphalt pavements
several cracks
viscoelasticity
stress intensity factor
temperature stress
