基层加固透水铺装结构受力性能试验研究

Experimental study on mechanical performance of permeable pavement structure with reinforced substrate

提出了一种采用土工格室进行级配碎石基层加固的道路改良铺装结构,为了对比与常规透水混凝土铺装结构在受力性能方面的差异,分析改良透水铺装结构应用于城市Ⅲ型道路的可行性,考虑土工格室的高度与焊距等因素设计了3种不同的改良铺装结构,并分别对3种改良铺装结构和1种常规铺装结构进行了受力性能试验,对铺装结构在不同工况的荷载作用下的表层沉降、基底应力以及土工格室应变进行了对比研究。结果表明:土工格室加固级配碎石基层的改良铺装结构完全满足Ⅲ型道路承载能力和变形限值的要求;高度为200mm、焊距为445mm的土工格室比另外两种规格土工格室对级配碎石基层的加固效果更加显著,能够有效地削减中心沉降与集中应力。

The improved pavement structure of road with reinforced graded macadam base by geocells was proposed,in order to compare with the conventional permeable concrete pavement structure in the mechanical performance,and to analyze the feasibility of the improved permeable pavement structure applied to the urban type Ⅲ road,three different improved pavement structures were designed considering the height of the geocell and the welding distance.The mechanical performance tests of the three types of improved pavement structures and one conventional pavement structure were carried out respectively.The surface settlements,base stresses and geocell strains of the pavement structures under different load conditions were compared and analyzed.The results show that the improved pavement structure of reinforced graded macadam base by geocells can fully meet the requirements of type Ⅲ road for its bearing capacity and deformation limit;the geocell with 200 mm height and 445 mm welding distance has more obvious reinforcement effect on macadam base than the other two kinds of geocells,and can reduce the center settlement and concentrated stress more effectively.