广东省海绵城市设施回填材料渗透性能研究

Research on the Permeability of Backfil Materials for Sponge City Facilities in Guangdong Province

对广东省常用种植土作为海绵城市绿化土壤的典型代表开展土壤渗透性能的改良研究,结合不同比例砂砾配比,提出适合广东省人工改良海绵设施回填土其主要成分砂石的比例。结果表明:组合砂石填充土壤的渗透性能比单种砂石填充土壤的渗透性能要好,且以粗砂+中砂组合效果最优。考虑土壤保水和渗水的共同作用,海绵城市绿地下层回填材料可以考虑在回填土中加入40%的砂粒占比,其中以粗砂加中砂方式混合回填土为最优。

In this paper,the commonly used planting soil in Guangdong Province is used as a typical representative of the sponge city greening soil to carry out a study on the improvement of soil permeability.Combined with different proportions of sand and gravel,the proportion of the main components of sand and gravel suitable for artificially improved sponge facilities in Guangdong Province is proposed.The results show that the permeability of the soil filled with combined sand and gravel is better than that of the soil filled with single sand and gravel,and the combination of coarse sand and medium sand is the best.Considering the combined effect of soil water retention and water seepage,40% of the sand should be used for the green space backfill,and the best way is to mix the backfill with coarse sand and medium sand.