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基于弹塑性损伤理论,该文使用有限元通用软件ABAQUS对于水泥稳定基层在养护时期受到干缩变形与温度变形的耦合作用下裂缝的产生进行了数值模拟。研究结果表明:使用弹塑性损伤理论可以很好地模拟基层裂缝萌生和扩展;数值计算结果中裂缝出现的间距与实际现场调查的结果相近。干缩变形是导致养护期间裂缝的产生的主要原因,该文研究结果可为实际基层施工过程中优化铺设厚度,合理设置伸缩缝间距提供依据。同时,该文开发了一个UEXPAN(User subroutine to define incremental thermal strains)的子程序,使用这一子程序可以将干缩变形引入到有限元计算中,这也为使用有限元方法研究干缩变形提供了一种新方法。
Based on the elasto-plastic damage theory, the finite element generalized software ABAQUS is used to simulate the crack generation under the coupling of dry shrinkage and temperature deformation during the curing period. The results show that the crack initiation and propagation can be well simulated using the elasto-plastic damage theory. The spacing of cracks in the numerical calculation results is similar to the actual field survey results. Dry shrinkage deformation is the main reason leading to cracks during curing. The results of this paper can provide the basis for optimizing the laying thickness and spacing of expansion joints in the actual process of grassroots construction. At the same time, a subroutine of User subroutine to define incremental thermal (UEXPAN) was developed, which can be used to introduce the shrink deformation into the finite element calculation. This also provides a method to study the deformation of the shrink deformation using the finite element method A new method.