海绵城市中生物滞留沟对路基水分场分布影响

随着城市化进程的不断加快,海绵城市作为一种新型的低影响开发理念,逐渐成为城市建设的趋势。就重庆某海绵城市试验路段为背景,研究海绵城市生物滞留沟对路基水分场的分布问题。在强降雨情况下,采用数值试验模型分析防渗膜半包情况下生物滞留沟对路基水分场的分布;再结合现场原位试验,采用高密度电法测量降雨前后电阻率分布,分析路基雨水下渗的分布规律。综合分析试验结果表明:该种路基结构形式能够满足海绵城市的吸、蓄、渗、净等要求。分析雨水下渗至路基的整个过程,得到路基水分场的分布情况;其中防渗膜对于降低雨水在车行道侧路基水分的增加起到关键作用。

Effect of Biological Retention Ditch on Water Distribution in Subgrade of Sponge city

With the rapid development of urbanization, sponge City, as a new concept of low impact development, has gradually become the trend of urban construction. In this paper a Chongqing City sponge test section as the background of city distribution channel bioretention sponge on the subgrade moisture distribution, in the case of heavy rainfall numerical test model analysis using membrane impermeable half package case bioretention field ditch on Lu Jishui. Combined with in situ tests using high density electrical resistivity distribution after rainfall measurement, analysis of road Jiyu water infiltration distribution. Comprehensive analysis of the test results show that this kind of roadbed structure can meet the suction, storage, sponge City permeability and net requirements; analysis of rainwater infiltration to the whole process, to obtain the distribution of moisture field, the impermeable membrane for reducing rainwater on the roadway side of subgrade increase water plays a key role.