生物滞留带构造对其渗蓄效果的影响

为了研究生物滞留带构造参数及组合方式对其渗蓄效果的影响,提出了判定生物滞留带渗蓄效果的评价指标,并对16组不同构造的生物滞留带开展模拟降雨径流正交试验,研究了种植土和填料层成分及含量、透水土工布位置、砂层颗粒级配和构造厚度对生物滞留带渗蓄效果的影响.研究结果表明:影响生物滞留带渗蓄效应程度大小的排序为:砂层级配>填料层成分和含量>结构层厚度>土工布位置>种植土成分和含量;生物滞留带最佳组合形式从上至下依次为:20 cm厚种植土,35 cm厚填料层(其中珍珠岩、蛭石、土壤和砂的体积占比为10%、5%、10%和75%),10 cm厚砂层(其中砂层颗粒级配为0～0.5 mm占15%、0.5～0.7 mm占40%、0.7～1.0 mm占30%、1.0～2.0 mm占15%),20 cm厚砾石层以及不设置透水土工布.

Influence of Biologic Retention Zone Structure on Its Infiltration-Storage

To investigate the influence of structural parameters and combination mode of the biologic retention zone on its infiltration-storage effect, the evaluation index for determining the infiltration-storage effect of biologic retention zone was put forward, and the 16 groups orthogonal experiments under the different conditions of the biological retention zone structural layer parameters were carried out. The composition and content of the planting soil and packing layer, the position of the geotextile, the grain gradation of the sand layer, and the thickness of structure layer on infiltration-storage effect of the biological retention zone were studied quantitatively. The results show that the degree of effect which varies from large to small is the grain gradation of sand layer, the composition and content of packing layer, the structural thickness, the position of geotextile, the composition and content of planting soil. The optimal structure of the biological retention zone from top to bottom is: 20 cm thick planting soil, 35 cm thick filler layer (the volume fraction are 10% perlite, 5% vermiculite, 10% loam, and 75% sand), 10 cm thick sand (0?0.5 mm accounting for 15%, 0.5?0.7 mm accounting for 40%, 0.7?1.0 mm accounting for 30%, and 1.0?2.0 mm accounting for 15%), 20 cm thick gravel layer, and without the geotextile.