Water diversion fracture zone height estimating method

Abstract

The invention provides a water diversion fracture zone height estimating method. The water diversion fracture zone height estimating method comprises the steps of firstly adopting a key layer position judgment method to confirm positions of key layers in overlying rocks by collecting surface drilling columnar information of the working face to be judged according to structural features of an overlying rock layer on a stope under the specific mining conditions; secondarily analyzing the ratios of the key layers to a coal seam separation distance and coal seam mining height to judge whether the key layer breakage gaps are through or not; the judging the development height of a water diversion fracture zone to terminate a bottom boundary of the key layer with non-through crack firstly occurring from bottom to top, and judging that the development height of the water diversion fracture zone extends to a top boundary of a bed rock if the breakage gaps of the existing main key layer in the judgment process is also through. The water diversion fracture zone height estimating method is used for roof water burst disaster prevention and control practice of coal mines, has high practicability, can adapt to the water diversion fracture zone height under different mining thickness conditions and meanwhile can perform judgment on the water diversion fracture zone height abnormal development situation caused by overlying rock key layer structure change.

Description

technical field [0001] The invention belongs to the technical field of underground mining of coal mines, and in particular relates to a method for predicting the height of a water-conducting fault zone. Background technique [0002] With the continuous implementation of the country's western development and energy strategy, the strategic position of coal is particularly important. However, with the gradual depletion of coal resources in the old eastern mining areas, the center of gravity of coal mining areas has gradually shifted to the northwest mining areas and Inner Mongolia. The coal seam occurrence and mining conditions in these mining areas are very different from those in the eastern mining areas, and have their own characteristics. Taking the Shenhua mining area as an example, the coal seam occurrence conditions are simple, with the characteristics of large coal seam thickness, generally 4m-7m, shallow buried depth, thin bedrock, and thick aeolian sand. In addition, ...

AI Technical Summary

Problems solved by technology

[0004] At present, many scholars have done a lot of statistical and theoretical research on the damage of the overlying rock and the height of water-conducting cracks in coal mining in my country. The Coal Pillar Retention and Pressure Coal Mining Regulations for Objects, Water, Railways and Main Shafts meets the requirements of coal mining design under the water body of coal mines in my country to a certain extent, but the results of the empirical formula are only related to the coal seam mining thickness parameters. The influence of the lithological structure of the overlying rock is not directly reflected in the empirical formula, but the height of the overlying rock water-conducting fault zone is calculated by using different empirical formulas according to the different classifications of the overlying rock hardness. Under specific mining conditions, it will As a result, the estimated height of the water-conducting fault zone deviates greatly from the actual one, and may even lead to some water inrush accidents, posing a great threat and hidden danger to mine safety production and water damage control

In addition, the thickness of the coal seam layered mining in statistical samples is generally less than 3.0m. When the thickness of the coal seam layered mining is greater than 3.0m, the empirical statistical formula in the "Procedures" is not applicable

Images