论文部分内容阅读
在这项研究中,通过与旋转硬化概念的结合来修正基于广义SMP准则的原始改良Cam-Clay模型,模拟在水泥混凝土板下碎石基层的塑性变形的发展,称之为旋转硬化Cam-Clay模型。模型通过预测塑性变形累计曲线和对碎石基层循环加载的三轴压缩试验得到的试验值相比较来确认。模型成功地预测了试件塑性变形的发展,塑性变形在一开始时迅速增长,此后增长的速率减小。该模型与三维有限元模型(3DFEM)结合,在足尺试验路面上进行模拟试验。试验发现,水泥混凝土路面的弯沉值随着荷载重复次数的增加而增加,表明在水泥混凝土板下由于基层的塑性变形而产生了缝隙。通过引入等效荷载次数的概念来模拟在合理的计算时间内施加大量循环荷载的塑性回应。模拟结果和试验数据比较表明该概念是有效的。此外,调查了由于基层缝隙而引起的水泥混凝土路面的力学响应(变形,压力以及弯沉)。
In this study, the original modified Cam-Clay model based on the generalized SMP criterion was modified by combining with the concept of spin-hardening to simulate the development of plastic deformation of the gravel base under the concrete slab, which is called the rotation hardening Cam-Clay model. The model is confirmed by predicting the plastic deformation cumulative curve compared with the experimental values obtained by triaxial compression tests of the cyclic loading of the gravel base. The model successfully predicted the development of the plastic deformation of the specimen. Plastic deformation rapidly increased from the beginning, and the rate of increase thereafter decreased. The model is combined with the 3D finite element model (3DFEM) and simulated on a full-scale test pavement. The experimental results show that the deflection of cement concrete pavement increases with the repetition times of the load, which shows that cracks are generated in the concrete slab due to the plastic deformation of the base. The concept of equivalent load times is introduced to simulate the plastic response with a large number of cyclic loads applied in a reasonable calculation time. The comparison of simulation results and experimental data shows that the concept is effective. In addition, the mechanical response (deformation, pressure, and deflection) of the cement concrete pavement due to the base gap was investigated.