It is practical to carry out sponge cities to manage rain and floods in collapsible loess areas where water resources and water disasters are prominent. The infiltration laws of the partial anti-seepage bioretention in collapsible loess fields are helpful to ensure the effectiveness and safety of sponge city, which were learned from the field test and numerical model. The seepage field and displacement field of loess sites with different collapsibility grades were compared during rainwater infiltration of the bioretention with the numerical model; the suitability and optimization suggestions for foundation treatment of this structure in various sites were proposed. It is found that the infiltration characteristics can be divided into three stages, and the infiltration range of bioretention increases with increasing infiltration time under the same site type, and the higher the collapsibility level of the site is, the more significant the rise in infiltration range. The settlement of adjacent roads in class II and III collapsible fields is far greater than that in class I and is greater than the settlement standard. The facilities’ bottom part foundation can be replaced to ensure the functionality of the facilities and the safety of the surrounding roads in the actual project.

中文翻译：

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不同湿陷等级黄土场地雨水入渗对相邻市政道路部分防渗生物滞留的影响

在水资源和水灾突出的湿陷性黄土地区开展海绵城市治理雨洪灾害具有现实意义。通过现场试验和数值模型得出的湿陷性黄土部分防渗生物滞留的入渗规律有助于保证海绵城市的有效性和安全性。用数值模型比较了不同湿陷性等级黄土场地在雨水入渗过程中的渗流场和位移场；对该结构在各场地的地基处理提出了适宜性和优化建议。发现渗透特征可分为三个阶段，同一场地类型下，生物滞留的入渗范围随着入渗时间的增加而增加，场地的塌陷度越高，入渗范围的增加越显着。Ⅱ、Ⅲ类可塌陷区相邻道路的沉降远大于Ⅰ类，大于沉降标准。在实际工程中，可以更换设施的底部基础，以保证设施的功能和周边道路的安全。