Under-water body mining overlying rock water flowing fractured zone development height prediction method

Abstract

The invention discloses an under-water body mining overlying rock water flowing fractured zone development height prediction method. The method comprises the following steps: (1) a probability integral method is used to calculate moving deformation of horizontal stratums with different buried depths in the overlying rock; (2) the stratum face strain rate epsilonS is used to characterize the fracture development degree of the stratum face in a normal direction in the overlying rock; (3) the stratum strain rate distribution map of the horizontal stratums with different buried depths is drawn; (4) a water flowing critical stratum face strain rate epsilon'S of a stratum with different lithology is determined; and (5) the stratum strain rate distribution map of the horizontal stratums with different buried depths of a target mine is judged to obtain an under-water body mining overlying rock water flowing fractured zone development height prediction value. The theoretical basis is rigorous,the operability is strong, the geology and the mining condition influencing the water flowing fracture are thoroughly considered, the water flowing fractured zone development height can be calculatedquantitatively, past excessive dependence on an empirical formula is got rid of, and a certain advantage is provided for evaluation on water break risks happening to the under-water body mining face.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a method for predicting the development height of a water-guiding fissure zone in overburden coal mining under a water body. Background technique [0002] Mining fissures in rock formations are channels for water seepage and gas accumulation and migration, and their research is of great significance, whether it is water conservation mining technology to protect the surface ecological environment, or a series of coal mine safety issues such as preventing water and sand in the overlying water-bearing rock and soil layer. Hidden dangers are all related to this. Taking the Zhaojin Coal Mine in Tongchuan City, Shaanxi Province as an example, there was a water inrush accident with a water inflow of about 50,000 cubic meters in the working face of the mine in 2013, and two small water inrush accidents occurred in December 2015 and March 2016. On April 25...

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Problems solved by technology

Although the above studies have achieved rich results, there are few studies on the mechanism of formation of fractures in rock formations to form water-conducting fissures, and there is no quantitative calculation and judgment of water-conducting fissures in rock formations.

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