摘要
在假定半刚性基层中有一贯通整个厚度的裂缝以及其反射到面层两种情况下，用有限元法对西三线模型在温度和荷载共同作用下的应力和裂缝尖端的应力强度因子进行了计算，估算了疲劳寿命，讨论了西三线半刚性基层沥青路面的开裂机理。计算结果表明，对于西三线而言，荷载应力是影响路面的主要因素，而温度应力也是不可忽视的；基层裂缝的存在对沥青路面的开裂起着重要作用；非对称荷载对裂缝的扩展影响更大。
Assuming a crack is in a semirigid base course or the crack reflect to the asphalt pavement, for Xi'anSanyuan highway model we compute the stress and the stree intensity factor at the tip of the crack under the loads and the changed temperature with the finite element method, and compute the fatigue lifetime of the highway. And then the fracture mechanism for the asphalt pavement on the semirigid base course is discussed. From the computational results, we know for the fracture of the asphalt pavement of Xi'anSanyuan highway model load stress is major and temperature stress is important, and the cracks in the semirigid base course play an important role for the production of a reflect crack of a sphalt pavement, and nonsymmetric load has more important influences on the development of a crack than symmetric load does.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
1998年第2期30-38,共9页
China Journal of Highway and Transport
关键词
有限元法
路面
沥青路面
断裂力学
Finite element method, Reflection crack, Stress intensity factor
