How to restore vegetation to the rock left after mining

How to restore vegetation to the rock left after mining

Granite mine is given priority to with open pit mining commonly, working face is bigger, as a result of long-term mining, hua gang stone mining area often can form huge open pit mine, bedrock large area is bare.For such a situation, if not timely treatment, light will affect the natural landscape, destroy the ecological environment, heavy will accelerate the weathering of the mountain, for the occurrence of geological disasters buried huge hidden trouble.
Among the various components of the granite mine, the rock wall is the most difficult part of the mine to green.Because the granite mining rock wall is hard and unweathered granite, after the mining process of large mechanical cutting, the bedrock will often form almost vertical Angle of the smooth rock wall.In such a rock wall, vegetation seeds and organic matter are difficult to adhere to the rock wall, because they cannot adhere to, and because there is no vegetation, no soil can intercept the natural will, and it is difficult for rain to permeate through the complete rock mass, plus this kind of rock is often water holding capacity is weak, poor fertility, nature can not grow.Therefore, in granite mines, we can often see some quarries abandoned for many years, but still little vegetation growth.
In the granite mine of macheng, the vertical wall is common in the granite mining area
So, in the actual work, we have what can be very good for the granite mine wall of the re - green method?
Step method
So-called step method, it is the use of the mining process of the formation of steps to plant plants, trees, shrubs mixed with the way to achieve the overall greening.This is one of the most widely used and sophisticated methods of repainting, especially suitable for steep terrain.
Need to point out especially is, because granite quarry is general up and down adjacent between the wall of the drop is larger, and the growth rate of trees, shrubs is slow, the ladder method can not make the mine in a short time to achieve a good green effect.And, because granite quarry all level platform is complete, hard breeze changes granite commonly, plant root system grows hard, consequently the survival rate of the plant and resist overturn ability cannot get assurance.Therefore, woody lianas are the best type of plants to assist trees and shrubs to carry out the stepwise greening.
The ladder method is very suitable for steep slopes
In addition, in order to improve the green recovery efficiency, the space of the mining platform can be fully utilized, and the three-dimensional greening method of climbing up and hanging down can be adopted, that is, climbing plants and hanging plants can be respectively planted on the platform.The climbing plants are planted on the inside of the platform, which is convenient for climbing to the upper wall, and the plants are hung on the outside of the platform, which is convenient for hanging on the lower wall.In order to improve the climbing hanging efficiency of plants and enhance the adhesion of plants, some metal mesh or wire can be added on the wall surface to assist plants to climb.
In any case, trees, shrubs, liana plants, climbing vine plants should choose local varieties with strong resistance, in order to be able to withstand drought, poverty, high temperature, strong light or wet, and have a certain ability to resist extreme climate change.
Spray green method
The so-called spray seeding complex green method, is the seeds, soil matrix and adhesive mixture through the high-pressure pump jet to the rock surface, the formation of a spray seeding layer.Because of the existence of seeding layer, the seeds of plants have a good growth basis for germination and growth.This method has high efficiency and can realize the rapid greening of mine slope.In the general municipal engineering, also often used for the highway slope greening.
However, this method is generally applicable to gentle slopes.For steep slopes of 45 to 60 degrees this method also requires the suspension of a metal mesh to increase the adhesion of the spray layer.For more than 60 degrees of steep slope, even if the metal mesh on the rock wall, due to the Angle problem, spray seeding layer is difficult to adhere to, and, because the granite quarry steep slope of the vast majority of the height of the rock wall are more than 10 meters, so the use of spray seeding in this steep slope using green method, not only difficult to operate, but also a considerable risk.
Wave table method
The so-called floating platform method is to drill holes in the rock wall and insert metal members into the hole after grouting.In this way, containers of various shapes can be erected on the surface of rock wall with metal components as supporting points. As long as matrix materials are added to the containers in the later period, plant planting can be carried out. Through plant conservation, the stems and leaves of plants can be covered on the slope, so as to achieve the purpose of overall greening on the slope.
It must be pointed out that the fish scale pit method is not applicable to the granite mining area
Generally speaking, the floating platform method is suitable for extremely steep and smooth rock wall, and it has better restoration effect for steep slope.However, it should be noted that it is difficult and expensive to build the construction platform for the high and steep rock wall over 10 meters.Therefore, before the use of floating table method, the use cost should be carefully measured.
Framework method
The so-called frame method refers to the use of brick, stone or cast-in-place reinforced concrete structure on the slope, forming different shapes of the frame.Through the frame structure, the mining hillside body can be stabilized, by backfilling the soil matrix in the frame, people can plant shrubs, herbs, etc., to achieve the purpose of slope protection and green.Frame method is also widely used in highway engineering and backer construction engineering.
Frame method is very common in highway engineering
However, it should be noted that this method is better for gentle and general steep slopes, and is not suitable for steep slopes over 60 degrees.On the one hand, the greater the slope is, the more difficult the frame construction is and the higher the cost is; on the other hand, the greater the slope is, the more difficult it is for the plant growth matrix to adhere effectively, and the green effect will be affected to some extent.
Therefore, for the general mining enterprises, if they want to re green the granite mine rock wall, they can consider on the basis of the ladder method, according to the actual situation of the steep slope for appropriate adjustment and improvement, and make full use of the advantages of spray seeding method, floating platform method, frame method in other appropriate terrain, in order to achieve the best effect of re green.