A method of adopting greening structured soil as a rainwater accumulator

Abstract

The invention relates to a method of adopting greening structured soil as a rainwater accumulator. The method includes steps of: weighing stone and soil according to a dry weight ratio of 4-5:1, uniformly mixing four raw materials comprising the stone, the soil, polyacrylamide (PAM) and gypsum, and adopting the obtained greening structured soil for a greening site of a hard road surface. By the method, the porosity under a maximum 100% compaction condition can be higher than 20%, the permeability is larger than 360 mm/h, and other physicochemical properties can meet the Greening Planting Soil CJ/T340-2011 standard in the national town construction industry. The greening structured soil has high rainwater penetration capability, and can be widely used for side pavements, business streets, public plazas, open-parking grounds, and other urban greening sites. The greening structured soil enhances the rainwater in-situ penetration property of hard greening road surfaces, relieves urban inland inundation and soil erosion, and plays a role of the rainwater accumulator. The greening structured soil provides good growing space, water and nutrients for root growth of plants and improves the greening quality of urban hard road surfaces.

Description

technical field [0001] The invention relates to a method for using greening structure soil as a rainwater accumulator, and belongs to the technical fields of urban greening, water administration and infrastructure construction. Background technique [0002] Urbanization is the theme of social development today. China is in the stage of rapid urbanization expansion. After urban expansion, it is covered by a large number of impermeable pavements. The surface runoff in highly urbanized areas can reach 5.5 times that before urbanization. Among several typical underlying surfaces in cities, the runoff coefficient of parks or green spaces is the lowest among several typical urban surfaces, only 0.10-0.20. The surface runoff is small, and most of the rainfall can infiltrate and conserve groundwater. As the main body of the city, the runoff coefficient of the roof and concrete or asphalt pavement is as high as 0.85 to 0.95, most of which form surface runoff, and the amount of rainfa...

AI Technical Summary

Problems solved by technology

Greening workers generally lack the necessary understanding of the basic concept, importance, influencing factors and design improvement requirements of soil ingress rate, let alone apply it well in actual work.

In my country, due to the rapid greening using a large number of heavy machinery, and the serious human trampling after the greenbelt is completed, the soil surveys of the greenbelts in Nanjing, Shanghai, Beijing and other places all show that the soil infiltration is very low. The soil with good texture has a soil infiltration rate below 10mm / h, which not only cannot meet the requirements of "rainstorm and flood" utilization, but will cause water accumulation and cause plant death

In addition, in order to enhance the natural infiltration of rainwater, in recent years, China has also vigorously advocated the use of permeable bricks for squares or sidewalks, but the depth of permeable bricks is only between 50 and 60mm. After using permeable bricks in many squares in China, water still occurs after heavy rains. The main reason is that the underlying surface under the permeable bricks has poor water seepage capacity. The underlying surface under the permeable bricks in my country mainly uses natural soil or cement. These underlying surfaces cannot play the role of rainwater re-infiltration, resulting in from It is difficult for the rainwater infiltrated by the permeable bricks to penetrate to the underlying surface below the permeable bricks