中文摘要：

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。

英文摘要：

Based on elastoplastic damage theory,the cracking evolution of a base course has been studied in the condition coupled thermal and shrinkage deformation effects,using the FEM software ABAQUS.The results indicated that： elastoplastic damage mechanics could simulate the production and evolution of cracking on the base course;the space between each cracking could also fit the data obtained from field performance;the shrinkage deformation accounted for the main reason inducing the base cracking,during the maintaining period.The research conclusion can provide a reasonable choice for the construction thickness and set rational separation for joints.At same time,a new user subroutine named UEXPSN（User subroutine to define incremental thermal strains） has been produced.Using this subroutine,shrinkage deformation can be imported in FE calculation.Based on this subroutine,a new research implement which can simulate shrinkage deformation is provided.