LIANG Hang-hang,LI Xiao-le,ZHANG Xun,et al.Optimization Analysis of Rainwater Infiltration in Bioretention Zone near Municipal Roads[J].China Water & Wastewater,2020,36(15):107-112.
近市政道路生物滞留带雨水入渗优化分析
- Title:
- Optimization Analysis of Rainwater Infiltration in Bioretention Zone near Municipal Roads
- Keywords:
- sponge city; municipal road; bioretention zone; anti-seepage membrane; fluid-soild coupling
- 摘要:
- 针对海绵型市政道路中生物滞留带的防渗膜铺设方式、防渗效果评价及雨水入渗影响范围的研究还存在较多不足，运用GeoStudio软件中的渗流分析模块SEEP/W和应力应变分析模块SIGMA/W进行流固耦合分析，对于雨水入渗作用下的两种不同类型生物滞留带，分析滞留带底部防渗膜外伸不同长度条件下地基土中含水量及沉降的变化规律，在确保雨水入渗不对路面产生致灾影响的前提下，对防渗膜外伸长度进行优化。数值分析结果表明：对于传输型生物滞留带，防渗膜可仅在侧面铺设；对于入渗型生物滞留带，防渗膜在设施底部两侧各外伸0.5 m时可满足滞留带雨水入渗的需要。入渗型滞留设施的放坡比越小，雨水入渗对地基土的影响就越小。
- Abstract:
- There are still many shortcomings in the study of anti-seepage membrane laying method, anti-seepage effect evaluation and influence range of rainwater infiltration in the bioretention zone of the sponge type municipal road. The percolation analysis module SEEP/W and stress strain analysis module SIGMA/W in GeoStudio software were used for fluid-solid coupling analysis. For two different types of bioretention zones under the action of rainwater infiltration, variation of water content and subsidence of foundation soil were analyzed when different extension lengths of anti-seepage membrane at the bottom of the retention zone were used. On the premise of ensuring that rainwater infiltration did not have a disastrous effect on the road surface, the extension length of anti-seepage membrane was optimized. Numerical analysis showed that the anti-seepage membrane could be laid only on the side in the transport-type bioretention zone. For the infiltration-type bioretention zone, when the anti-seepage membrane extends 0.5 m on both sides of the bottom of the facility, it could meet the need of rainwater infiltration in the detention zone. The smaller the grading ratio of the infiltration-type retention facilities was, the less the impact of rainwater infiltration on the foundation soil under the same conditions had.
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