Extraction mode and engineering demonstration of pressure relief three-dimensional of multi-coal seams in Pingdingshan mining area

• Published in: Méitàn kēxué jìshù Vol. 52; no. 9; pp. 162 - 172
• Main Authors: Yanhe LI, Xiaoming NI, Jinsheng JIA
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Coal Science and Technology 01.09.2024
• Subjects: active mining area; coal bearing gas; goaf area; pingdingshan mining area; pressure relief of multiple coal seams; three-dimensional extraction mode
• ISSN: 0253-2336
• DOI: 10.12438/cst.2024-0742

There are many coal seams and gas-bearing strata in Pingdingshan mining area, and the amount of underground gas control project is large and difficult. In order to establish a new model of gas drainage in Pingdingshan and achieve the purpose of mining one layer and extracting multiple layers, the main gas-bearing layers and gas content of coal measures were accurately identified by combining gas logging and gas content testing. The coal measures gas resources in the mining area and goaf of five pairs of mines in the east are evaluated by the volume method. Based on the theory of “O-ring” and the concept of “prevent-allow-resist”, the positions of wells and the positions of layers, and wellbore structures of the mining wells and of goaf wells were optimized respectively. A multi-coal seam pressure-relieving three-dimensional extraction model of the active mining and goaf area constructed and an engineering demonstration was carried out. The results show that: ① There are three main gas bearing sections within