Method for preventing and controlling limestone water in coal seam exploitation floor

Abstract

Provided is a method for preventing and controlling limestone water in a coal seam exploitation floor, and the method can solve the technical problems that limestone water damage of the floor is proneto occur in the mining process of the Carboniferous Permian coal resources in China. The method includes the following steps: S100, comprehensively exploring hydrogeological conditions of limestone of a coal seam floor; S200, dividing the positions of a limestone karst water-containing layer and water-blocking layer in the coal seam floor, so as to determine the specific layer position to be transformed; S300, performing grouting transformation and drainage pressure reduction according to the specific layer position; S400, detecting a vertical water channel of the coal seam floor by using geophysical exploration, and then conducting grouting and sealing; and S500, synthetically evaluating the grouting and treatment effect based on a combination of detecting verification of the grouted transformation layer and drilling core analysis, so as to determine feasibility of safe mining. According to the present invention, the coal seam floor is divided into the limestone karst water-containing and water-blocking layer on the basis of the comprehensive exploration of the limestone hydrogeological conditions of the coal seam floor, and the specific layer position to be transformed is determined, grouting transformation and drainage pressure reduction are performed, geophysical exploration is used to detect the channel, and then grouting and sealing are performed. Finally, comprehensiveevaluation is conducted through various methods such as a water bursting coefficient, numerical simulation, geophysical exploration and drilling detection to determine the feasibility of safe mining.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for preventing and controlling limestone water in a coal seam mining floor. Background technique [0002] During the mining of Carboniferous Permian coal resources in my country, limestone water damage has always been one of the important sources of disasters threatening its safety. Once the water bursts, it will not only cause harm to mine safety production, but also cause significant economic losses. According to statistics, from the 1950s to the present, when the coal seams of the Shanxi Formation and the Taiyuan Formation of coal mines in northern my country were mined, there were nearly 1,300 times of water inrush due to limestone aquifers, of which more than 200 well flooding accidents occurred, causing great economic losses and human resources. Casualties. In recent years, with the gradual depletion of shallow resources, the mining of coal resources has conti...

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Problems solved by technology

[0003] A method for preventing and controlling limestone water in the mining floor proposed by the present invention can solve the techni

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