Abstract
The effective and reasonable construction of the low impact development (LID) facilities in loess area depends on the functionality of typical LID facilities and the safety of surrounding structures in areas. A full-scale field test on rainwater-concentrated infiltration of bioretentions in a collapsible loess site was conducted in this study. The water content and deformation law of the site were analyzed, and the water movement law of the rainwater-concentrated infiltration at bioretention facilities in the loess site was determined. The site settlements were calculated as per the wetting deformation curve and infiltration depths were calculated on an improved infiltration depth model tailored to the loess area. The rainwater infiltration rules of different bioretention structural forms are different in the collapsible loess field. The diffusion rate of the retaining wall type in loess decreases over time, while that on a sloping type does not. Within the same infiltration time, the retaining wall has a stronger influence on the site than the sloping type. When the water is concentrated in the site, its influence on the subgrade settlement is small (generally less than 1.5 mm) enough to satisfy the relevant engineering requirements. Facilities water infiltration laws in the site can be predicted using the fractional unsaturated infiltration model and a modified Green-Ampt model based on assumed loess saturated–unsaturated stratification. The adverse effects of water infiltration related to stagnant bioretentions can be mitigated by adjusting the initial water content and saturated water content at the loess site.
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Funding
This research is funded by the National Natural Science Foundation of China (Grant Nos. 41877285, 41472267) and the Research Funds of Management Committee of Fengxi New City in Xixian New Area (Grant No. 214028170390).
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XW: investigation, data curation, formal analysis, writing — original draft. ZH: conceptualization, methodology, project administration, writing — review & editing. YJ: conceptualization, methodology, project administration, writing — review & editing. XZ: conceptualization, methodology, validation. YZ: conceptualization, investigation. SC: methodology, investigation.
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Wen, X., Hu, Z., Jing, Y. et al. Effects of rainwater infiltration in low impact development facilities on adjacent municipal roads in collapsible loess. Bull Eng Geol Environ 81, 25 (2022). https://doi.org/10.1007/s10064-021-02536-4
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DOI: https://doi.org/10.1007/s10064-021-02536-4