A combined regional grouting method for up and down wells

Abstract

The invention relates to a surface and underground combined regional grouting method. The method is characterized in that an overburden gob area open-off cut grouting region grouting amount computational formula, a grouting computational formula of the coal bed open-off cut and other positions, an overburden gob area open-off cut ground grouting well location and computational formula and a grouting slurry release opening or grouting inserting pipe arrangement and computational formula of the coal bed open-off cut and other positions are included. The problems that the overburden gob area open-off cut is upward grouted from the ground, and during grouting hole driving, hole collapse happens to a bent sinking zone or / and the position entering the fissure zone are solved; when mining of oversized goafs is carried out on shallow mining depth nearly-horizontal close-distance coal seam groups, grouting of the coal bed open-off cut and other grouting regions is combined, the hidden danger that combustion of the overburden gob area and the coal bed happens, and consequently coal exploration of the coal bed and a lower layer is influenced is eliminated, the aim of preventing natural combustion of remaining coal of the goafs is achieved through the technical method, and the grouting amount is effectively controlled; and the method is easy to operate, safe and reliable, and the effect is good.

Description

technical field [0001] The invention relates to a grouting method, in particular to an upper and lower combined regional grouting method for coal seam group mining super large gobs with shallow burial depth, near horizontal and short distances. Background technique [0002] Coal spontaneous combustion fire is one of the major mine disasters in my country. The mines threatened by spontaneous combustion fire account for about 70% of the total number of mines. Coal mine fire accidents will not only produce a large amount of toxic and harmful gases, but also seriously threaten the lives of underground workers. Secondary disasters such as dust and gas explosions are even more serious. According to incomplete statistics, since 2000, there have been 65 internal fire accidents causing casualties and 804 deaths, including 18 gas explosion accidents caused by internal fires and 461 deaths. [0003] Some mines in western my country's mining areas such as Ningmei Coal and Shendong have ...

AI Technical Summary

Problems solved by technology

[0007] Specifically, in the grouting project of opening the goaf from the ground to the overlying goaf, when the grouting hole is drilled at one time, the subsidence zone bends or / and the collapse hole appears at the place entering the fracture zone. 1. Grouting in the local coal seam opening and other grouting areas when mining super-large goafs with close-distance coal seam groups cannot eliminate the fire in the overlying goaf and the fire in the coal seam, which affects the mining of the coal seam and cannot effectively prevent the coal residue in the goaf Natural fire, at the same time, the amount of grouting can not be effectively controlled, resulting in waste or insufficient, affecting the progress of the project

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