基于熵权-TOPSIS模型下瓯江北口大桥聚氨酯铺装体系碎石优化

Gravel scheme optimization of polyurethane paving system under entropy right-TOPSIS model in Oujiang Beikou Bridge

为保证瓯江北口大桥下层桥钢桥面铺装具备良好的服役性能,依托瓯江北口大桥下层桥钢桥面铺装项目,以碎石撒布量和碎石粒径为变量设计正交试验,对多种碎石方案下的组合试件进行层间拉拔试验、高温车辙试验与低温弯曲试验,研究性能指标分别与碎石撒布量、碎石粒径间的变化趋势,并以试验指标为基础建立模型数据集;综合熵权法与TOPSIS优化法,建立以层间黏结性能、高温稳定性与低温抗裂性为评价指标的熵权-TOPSIS碎石优化模型;将数据集导入优化模型进行计算。研究结果表明:碎石撒布量与碎石粒径对聚氨酯铺装体系3种性能的影响趋势存在差异性;当碎石撒布量为6.5 kg/m^(2)且碎石粒径处于(2,3]mm时,聚氨酯铺装体系兼具较好的黏结性能、高温稳定性与低温抗裂性;并将该方案应用于实际工程中,证明按提出方案施工成型的铺装层服役效果优良,印证了该碎石方案的优异性与熵权-TOPSIS碎石优化模型良好的现实适用性,可为聚氨酯铺装体系的发展提供理论依据,同时也可为其他铺装体系的碎石优化提供解决方案。

In order to ensure that the steel deck paving of the lower bridge of the Oujiang Beikou Bridge has good service performance,relied on the paving project of the Oujiang Beikou Bridge and the orthogonal test were designed with gravel sprinkler and gravel particle size as variables.The pulling test,high-temperature rutting test and low-temperature bending were applied to test the combination specimen with multiple gravel scheme.The variation trends between the performance indexes,the amount of crushed stone spreading and the particle size of crushed stone were studied,and the model data set was established.Comprehensive entropy power method and TOPSIS optimization method,the entropy right-TOPSIS gravel optimization model was established which contained inter-layer bonding performance,high temperature stability and low temperature resistance as the indexs.The data list was imported to the model for calculation.The results show that there are different trends in the influence of crushed stone particle size and spreading amount on the three properties.When the gravel sprinkle is 6.5 kg/m^(2) and the gravel particle size is 2 to 3 mm,the polyurethane paving system has good adhesion performance,high-temperature stability and low-temperature crack resistance.Apply the scheme to actual engineering projects,it is proved that the paving layer formed according to this crushed stone scheme has excellent service effect,which also proves that the superiority of the gravel scheme and the actual applicability of the strong-TOPSIS gravel optimization model.It provides a theoretical basis for the application and development of polyurethane paving system and it also provides a solution for crush optimization of other paving system.13 tabs,8 figs,27 refs.