High-strength mining rock stratum migration grouting control and grouting amount calculation method

Abstract

The invention provides a shallow-buried high-strength mining rock stratum migration grouting control and grouting amount calculation method, and belongs to a coal mine high-strength mining damage control and surface damage reduction method. Aiming at a shallow-buried high-strength overlying strata large-damage two-zone development structure of a western mining area, the invention provides a low-damage three-zone overlying strata structure formed by grouting and filling a caving zone and a bed-separated fissure zone, so that the surface damage is greatly reduced. The shallow-buried high-strength mining rock stratum migration grouting control and grouting amount calculation method mainly comprises the steps of determining the position of an overlying strata key layer; calculating maximum deflection w of the key layer before breaking; calculating a grouting amount calculation formula Vg=piwLd/3 required by the bed-separated fissure zone, and determining the height H1 of the caving zone according to the mining height of the coal seam working face and the properties of a roof and a floor; and further giving a calculation formula Vk = dH1L-Vg-(H1-M)bdL of the grouting amount of the caving zone for ensuring that the key layer is not broken; according to a calculation result, after a lower main roof of the working face is fractured for the first time, drilling a well from the ground and grouting into the caving zone; and when the working face is pushed to one square, beginning to grout the bed-separated fracture body. The shallow-buried high-strength mining rock stratum migration grouting control and grouting amount calculation method is as shown in the drawing of the abstract. By implementing the shallow-buried high-strength mining rock stratum migration grouting control and grouting amount calculation method, the surface damage degree of shallow-buried high-strength mining can be greatly reduced, and green mining of ecologically fragile regions of western mining areas isrealized.

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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