Ecological restoration method for coal mine waste rock mountain

Abstract

The invention discloses an ecological restoration method for a coal mine waste rock mountain. The method comprises the following steps of (1) reducing the slope surface of the waste rock mountain, reducing the slope to 20-30 degrees, stabilizing the slope surface, and setting a drainage system; 2) laying loess on the surface of the spontaneous combustion waste rock mountain, and compacting to isolate an air approach, so that the internal air of pontaneous combustion waste rocks is exhausted and extinguished; (3) conducting seed-spraying on the coal mine waste rock mountain slope by using a loam-like substrate spraying method, specifically, laying a metal mesh on the surface of the compacted loess, and fixing with a bolt, spraying on the subsoil of the loam-like substrate, and spraying on the surface of the loam-like substrate; (4) conducting curing management of the slope, covering a non-woven fabric, reinforcing, watering, fertilizing, conducting pest control, replanting and conducting post-monitoring. The ecological restoration method for the coal mine waste rock mountain adopts loess cover, isolates air to prevent the spontaneous combustion of the waste rocks, and adopts a loam-like soil spraying technology to conduct plant seeding to achieve ecological restoration.

Description

technical field

[0001] The invention relates to an ecological restoration method for gangue hills in coal mines, and belongs to the technical field of gangue hill management and restoration. Background technique

[0002] Coal mine production has a large amount of waste rock, which generally accounts for 15%-20% of the raw coal output per month. With the development of the coal industry, the amount of waste rock continues to increase, and the accumulation volume continues to expand. According to incomplete statistics, there are more than 1,500 gangue dumps in my country's state-owned coal mines, with an annual accumulation of 3 billion tons and an area of ​​5,000 hectares. Due to dumping or natural rolling, the slope of the gangue slope has a static repose angle of 40 degrees, and the stability is extremely poor. Landslides are prone to occur when unfavorable conditions are encountered. In addition, the gangue is unevenly distributed and has a loose structure. On windy days,...