摘要
考虑了沥青混合料的热粘弹特性,结合热传导理论,通过有限元数值模拟,研究在温度场作用下反射裂纹的应力场。分析表明,在较低温度环境下,会使基层裂纹附近存在高应力区,当其应力值大于沥青的抗拉强度时,会导致裂纹的产生并扩展到路面形成路面裂纹。提出了采用聚酯纤维增强型沥青的阻裂方案,通过数值模拟验证了其有效性。
Based on theories of visco-elasticity and heat transfer, the stress field of reflective crack under the temperature field is studied by finite element simulation. The influence of variation stress fields and road design parameters for the temperature stress of crack are discussed. It shows that the surface stress near the crack is larger than the tensile strength of asphalt, which leads to the crack propagation. The scheme of crack prevention, in which the polyfibre geogrid is used, is presented. Numerical results show the validity of it.
出处
《土工基础》
2008年第5期59-61,64,共4页
Soil Engineering and Foundation
关键词
聚酯纤维
反射裂纹
温度应力
有限元法
polyester fibers, reflective crack, temperature stress, finite element method
