Ecological restoration method for step slope-to-step conversion of strip mine dumping site

Abstract

The invention discloses a step slope-to-step ecological restoration method for a strip mine dumping site, and relates to the technical field of mining area treatment. The method comprises the following steps: firstly, determining parameters of steps according to a stable slope angle of the dumping site and the total design height of the dumping site suitable for a scheme implementation site, and obliquely mounting a continuous supporting plate and a back plate at the slope bottom line position of the lowest step of the dumping site according to the determined inclination angle; then block stones selected and mined by the strip mine are discharged in the space between the supporting plate and the back plate and the step slope surface of the original waste dump, after a supporting body is formed through grouting, the back plate is moved and arranged, and the steps are repeated to build multiple layers of steps till the top of the waste dump is horizontal; and finally, green vegetation is planted on the constructed step platforms, and climbing plants are planted on the bottom line of each step slope to cover the slope surface. Under the conditions that the capacity of the strip mine dump is not influenced and the occupied area is not additionally increased, the slope area of the strip mine dump can be greatly reduced, the platform area is greatly increased, and a foundation is provided for green planting.

Description

technical field [0001] The invention relates to the technical field of geological governance and ecological restoration in mining areas, in particular to an ecological restoration method for changing a step slope to a ladder in an open-pit mine dump. Background technique [0002] In order to reduce the impact of open-pit mining on the surrounding environment, ecological restoration and soil and water conservation measures should be taken at the open-pit mine dump. However, since the slope angle of the dump site is generally 30-35°, it is difficult for water to penetrate into the soil during precipitation or artificial watering, and most of it is lost in the form of surface runoff, so it can only be solved by frequent watering. This increases the cost of greening and reclamation, and causes soil erosion, further increasing the difficulty of ecological restoration, and severely limiting species selection and restoration effects. If the slope greening is abandoned, only the st...

AI Technical Summary

Problems solved by technology

However, since the step slope angle of the dump site is generally 30-35°, it is difficult for water to penetrate into the soil during precipitation or artificial watering, and most of the water is lost in the form of surface runoff. Therefore, frequent watering can only be used to solve the problem. The cost of greening and reclamation is increased, and soil erosion is caused, which further increases the difficulty of ecological restoration and severely limits species selection and restoration effect.

If we abandon slope greening and only carry out greening on steps and platforms, and adopt the ecological restoration method of "blocking the slope with flatness", there will be problems such as low treatment rate and poor effect

This is mainly due to the large step height and small slope angle of the dump site, resulting in a large slope length (up to 30m or more). Generally, the area of ​​the slope surface far exceeds the area of ​​the step platform, and the area of ​​the dump site that can be planted with green plants Greatly shrinking, seriously affecting the ecological restoration effect of the dump site; at the same time, soil erosion on unrepaired slopes will also threaten the stability of the platform ecosystem

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