A method for grouting control and grouting amount calculation of rock formation migration in high-strength mining

Abstract

The invention discloses a grouting control and grouting amount calculation method for shallow buried high-intensity mining rock formation, which belongs to the high-intensity mining damage control and surface damage reduction methods of coal mines. Aiming at the "two-zone" development structure of shallow buried high-strength overlying rock and large damage in the western mining area, the present invention proposes that the caving zone and the separation layer fissure zone are grouted and filled to form a low-damage "three-zone" overlying rock structure, which greatly slows down the surface damage. The main steps include: determining the location of the key layer of the overlying rock; calculating the maximum deflection w before the key layer breaks; calculating the grouting volume required for the separation layer fissure zone. h 1 ; and then give the calculation formula V k =dH 1 L‑V g -(H 1 -M)bdL. According to the calculation results, after the initial fracture of the lower basic roof of the working face, drill wells from the ground to inject grout into the caving zone; when the working face advances to a square, start grouting to the separated layer fracture body; as shown in the abstract. The implementation of this method can greatly reduce the surface damage of shallow burial and high-intensity mining, and realize green mining in the ecologically fragile areas of the western mining area.

Description

technical field [0001] The invention relates to a high-strength mining damage reduction method for shallow buried coal seams, in particular to a mining damage control method based on grouting to control rock layer migration. Background technique [0002] With the advancement of technology and equipment, the scale of underground coal mines in my country has grown from a million-ton level (1-3 million tons / year) in the 1990s to a tens-million-ton level (10-30 million tons / year) at the beginning of this century. Years), the level of mining and coal mining has been continuously improved, and it has become an important way to improve the safety and security level of coal mines, the resource recovery rate and economic benefits. According to the layout of intensive development, the output of my country's 14 large coal bases accounts for more than 95% of the country's total. High-intensity mining is an important method of intensive mining, but it brings about rapid surface subsidenc...

AI Technical Summary

Problems solved by technology

However, due to the rapid advancement of high-intensity mining, the large size of the mining face, the large damage range of the overlying strata, the rapid surface subsidence and large deformation, the high degree of damage to the surface and ecology, and the prominent contradiction between resource development and ecological mining area construction, etc., it is very difficult. It is difficult to control the degree of surface damage from the source

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