Hydro-mechanical interaction in permeable pavement constructions under consideration of unsaturated states

本研究的主要目的是为透水道路结构的设计提供依据，从而量化和考虑局部饱和对道路施工各层应力-应变行为的影响。结果表明，采用聚氨酯（PU）作为粘结材料可显著提高粘结路面的抗疲劳性能和耐久性。为了实现这一目标，在项目的第一阶段，已经在模型和现场尺度上对材料的力学和水力行为进行了基础实验研究。试验结果应应用于第二个项目阶段，以校准水力和机械材料规律。这些也应用于透水道路结构的承载性能的数值分析，以尽可能真实地模拟系统在车轮荷载下的力学和水力耦合行为。对透水路面断面的水力和机械系统性能的优化建议应从模拟结果中得出。此外，还将进行深入的实验检查：一方面，计划利用成像方法对多孔层的孔隙空间进行研究。此外，还计划确定影响排水能力的因素。另一方面，应再次使用移动负载模拟器MLS30进行负载测试，以评估高次数负载循环对系统的影响，特别是对pu绑定的路面层的影响。

The primary concern of this research is to provide a basis for the design of water-permeable road structures, whereby the effects of partial saturation on the stress-strain behavior of the individual layers of the road construction will be quantified and taken into account. Furthermore, it will be shown that by using Polyurethane (PU) as an alternative binder material the fatigue resistance and the durability of the bound road surfaces can significantly be improved. To fulfill the objectives, fundamental experimental investigations for both the mechanical and hydraulic behavior of the material in model and field scale have been undertaken in the first project phase. The results of the tests should be applied in the second project phase to calibrate the hydraulic and mechanical material laws. These should also be used in numerical analyses of the load-bearing behavior of water-permeable road structures to simulate the coupled mechanical and hydraulic behavior of the system under wheel load as realistic as possible. Recommendations for an optimized hydraulic and mechanical system behavior of the permeable road cross-section should be derived from the simulation results. In addition, in-depth experimental examinations are to be conducted: on the one hand, studies on the pore space of the porous layer using imaging methods are planned. Additionally, it is planned to identify the factors affecting drainage capacity. On the other hand, load tests with the mobile load simulator MLS30 should be done again to evaluate the influence of a high number of load cycles on the system and particularly on the PU-bound pavement layers.