Abstract
Low-impact development measures are a kind of ecological technology system that can easily realize urban rainwater collection and utilization to alleviate the contradiction between flooding/water logging disasters and water shortages. But most of the low-impact development measures are difficult to solve the problem of deep soil infiltration and fully utilize runoff regulation and seepage benefits. Therefore, this paper proposes the concrete microseepage well with the optimum proportion of crushed stone, cement, and water of 1 : 0.13 : 0.11 and 2% steel fiber content. The artificial rainfall experiment is applied to verify the high-infiltration of concrete microseepage well in deep soil. The numerical analysis shows that the concrete microseepage well around a single building and two adjacent buildings can all decrease 15%–40% of the pore water pressure, decrease 11%–33% of total head, and improve 43–55 times of infiltration velocity. The concrete microseepage well with 0.1 m in diameter and 1 m in height can affect the infiltration area of 1 m2. Each building being surrounded by seepage wells is the optimal layout scheme to alleviate the flooding/water logging disasters. This study provides a scientific reference for the development of sponge cities with low-impact development measures to reduce the problem of flooding/water logging disasters and water shortages.
Highlights
With increased urbanization, the contradiction between flooding/water logging disasters and water shortages is increasingly prominent
Zhu et al [9] used construction waste to form a seepage well and studied the water content of the soil layer under different spacings and depths of these wells. eir results proved that seepage wells effectively enhance the horizontal and vertical infiltration of the soil layer
Liu et al [11] carried out single-well and group-well infiltration tests in an area with predominantly clay soil and found that the grave seepage well was suitable for rainwater infiltration in such areas
Summary
The contradiction between flooding/water logging disasters and water shortages is increasingly prominent. Xu et al [8] adopted steel gravel piles to carry out outdoor water injection tests on different types of permeable paving in low-infiltration soil areas and showed that the infiltration rate increased by 18–35 times over that without steel gravel piles. Liang et al [12] used numerical simulations and model tests to study the improved effect of seepage wells on infiltration and runoff control of a Advances in Materials Science and Engineering permeable grid under 72 rainfall conditions in Shijiazhuang, China. Numerical models of buildings and microseepage wells are verified by comparing the pore water pressure and infiltration velocity in the reference. Verified numerical models of buildings and microseepage wells are applied to analyze the pore water pressure, total head, and infiltration velocity with no seepage wells placed around buildings, seepage wells placed around a single building, and seepage wells placed around two adjacent buildings. The optimal layout scheme of concrete microseepage wells in the buildings is obtained based on the response of the pore water pressure, total head, and infiltration velocity. is research provides a scientific reference for the development of low-impact rainwater systems in so-called “sponge cities.”
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