Large-mining-height stope coal wall rib spalling depth measurement method

Abstract

The invention provides a large-mining-height stope coal wall rib spalling depth measurement method, which is suitable for coal wall rib spalling depth monitoring and prevention under a large-mining-height condition. The method is characterized by selecting one rib spalling measurement point every a certain distance on a large-mining-height working face; mounting a glass fiber reinforced plastic anchor rod uniformly provided with fiber grating sensors on a coal wall; carrying out real-time transmission data analysis through a computer to obtain stress and its variation of each section of the anchor rod; and according to the phenomenon that the anchor rod section corresponding to the rib spalling section decreases in stress, obtaining depth range of the rib spalling. The method monitors therib spalling depth on the basis of preventing coal wall rib spalling, and provides favorable conditions for safe and efficient mining of the large-mining-height working face.

Description

technical field [0001] The invention relates to a method for measuring the depth of a coal wall slab in a large mining height stope, and belongs to the technical field of surrounding rock control in coal mining and mining working faces. Background technique [0002] The large mining height mining technology has the advantages of high production efficiency, high unit yield, low roadway excavation, small maintenance, high coal recovery rate, less moving face equipment, simple process and low gangue content. Now the superiority and high productivity of this coal mining method have been recognized by the society, and it has gradually become one of the most important development directions of thick coal seam mining in my country at the present stage. However, with the increase of mining height, the probability of coal wall spalling increases correspondingly, and the phenomenon of coal wall spalling becomes more and more serious, which poses a huge personal threat to underground w...

AI Technical Summary

Problems solved by technology

However, with the increase of mining height, the probability of occurrence of coal wall slabs increases correspondingly, and the phenomenon of coal wall slabs becomes more and more serious, which poses a huge personal threat to underground workers and affects the safety of coal mine production.

[0003] In terms of coal wall flaking, the existing research results mostly focus on the analysis of factors affecting coal wall flaking, the study of flaking mechanism, the method of flaking, the form and type of flaking, and the technical measures to prevent and control coal wall flaking. There is no effective method for monitoring the depth of coal wall spalling, which directly limits the accurate determination of the method of controlling coal wall spalling and its parameters

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