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Water retention method of back fill course

A soil layer and water-retaining layer technology, applied in soil protection, construction, infrastructure engineering, etc., can solve the problems of increasing the thickness of the backfill planting soil layer, poor water retention effect of the soil layer, and water evaporation loss, so as to reduce artificial irrigation and maintenance , easy construction, and the effect of reducing the dosage

Inactive Publication Date: 2009-06-10
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

One of the existing problems is that the water retention effect of the soil layer is poor after the vegetation is planted with soil, especially when the soil layer is thin, the water evaporation loss is serious, and the vegetation needs continuous irrigation and maintenance to survive, which costs a lot, and many places cannot keep up with it due to later maintenance. , the planted vegetation gradually dies
However, increasing the thickness of the backfill planting soil layer requires a large amount of soil resources and high freight costs, which requires a large investment.

Method used

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  • Water retention method of back fill course
  • Water retention method of back fill course

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment one, figure 1 Shown is a schematic diagram of the structure of each layer of backfill soil layer greening on the excavated surface of a certain mine. According to geological surveys, the elevation of the bottom of the quarry pit in the quarry mine is +28.0 meters, and the long and short axes of the projection of the pit mouth are 50 meters and 30 meters respectively (the short axis is vertical Contour direction), the pit depth is 5-7.6 meters; the single slope is 5°, and the elevation is +33.0-+35.6 meters. It is required to plant lawns and local shrubs after restoring the terrain.

[0019] Since the terrain height difference is 2.6 meters, which exceeds 1.5 meters, a grid ridge h is built along the contour line to divide the slope into two parts. Each part has a terrain height difference of 1.3 meters and a bottom projection width of 15 meters. The planting soil layer f is designed to be about 0.3 meters, with a top slope of 5°; the water-retaining layer d h...

Embodiment 2

[0026] Embodiment two, figure 2 Shown is a schematic diagram of the filling-type reclamation layer structure of a subsidence site, a coal mining stable subsidence site, the elevation of the pit bottom is +30 meters, and the elevation before the subsidence is +38 meters. The dry land is now restored by filling coal gangue.

[0027] The designed planting soil layer f is about 0.4 meters thick with a slope of 0°; the water-retaining layer d is about 0.5 meters thick with a slope of 0°; a layer of clay plastic anti-seepage layer c; the solid waste foundation a is made of coal gangue with a slope of 0°, then The thickness is 0-7.2 meters.

[0028] The specific steps are:

[0029] (1) Filling solid waste foundation a: Coal gangue filling is carried out several times, and each laying is about 1 meter thick and compacted to meet the compaction standard, and then the second layer is laid and compacted, and proceed in sequence to reach the design elevation + 37.1 meters ;

[0030] ...

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Abstract

The invention discloses a water-keeping method for a backfill soil layer used in recovering green for a waste mine or a re-cultivating filling type land. The method comprises: determining bottom elevation of a seepage-proof layer according to the terrain of the areas to be recovered green in the waste mine, determining top elevation of a planting layer according to requirement of terrain design, and determining thicknesses of the planting layer and a water-keeping layer according to types of vegetation to be planted; and filling a solid waste foundation, a rigid seepage-proof layer, a plastic seepage-proof layer, the water-keeping layer and a planting soil layer from top down in turn. As the design of the water-keeping layer is adopted, after survival of the vegetation, only less water even no water is needed to meet the demand of moisture by the vegetation, so the method ensures long-term effect of biological recovery and is suitable for recovering green of waste mines in arid regions and semi-arid areas. Whether the solid waste foundation is filled stably or not does not influence the effect of water keeping so as to save time for the construction. The water-keeping method is simple and easy to construct, can increase water keeping space and effect, and can greatly reduce use of soil for planting.

Description

technical field [0001] The invention relates to a water retention method for backfilling soil layers, and is especially suitable for water retention of backfilling soil layers in ecological restoration of abandoned mines in arid and semi-arid regions. Background technique [0002] Abandoned mines, especially quarrying mines, have a poor ecological environment, and it is difficult to restore vegetation due to the lack of soil layers. In the process of ecological restoration of abandoned mines in arid and semi-arid areas, plants are mainly planted by backfilling a certain thickness of planting soil. One of the existing problems is that the water retention effect of the soil layer is poor after the vegetation is planted with soil, especially when the soil layer is thin, the water evaporation loss is serious, and the vegetation needs continuous irrigation and maintenance to survive, which costs a lot, and many places cannot keep up with it due to later maintenance. , the plante...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00
Inventor 王辉鞠远江李钢卞正富
Owner CHINA UNIV OF MINING & TECH
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