The complex coal seam structure and hard roof at the Muchengjian Mine were studied, and the equivalent tensile strength of the roof was determined by a retrospective analysis of similar roof cave-ins. The prop spacing or number of hydraulic props required per unit area were obtained by analyzing the roof caving span and thickness. The early warning threshold bedding vertical separation velocity for hard roof caving at the Muchengjian Coal Mine was determined to be about 14 mm/day, and the newly invented ''bedding separation remote monitoring system'' (BSRMS) was used for the first time for early warning of a roof fall. A total of 48 trials of early warning roof weighting were performed at the Muchengjian Mine. It was found that not only were all the early warnings accurate, but the support system was also safe and reliable.Résumé : La structure complexe des couches de charbon et du toit à la mine Muchengjian a été étudiée. La résistance en tension équivalente du toit a été déterminée à partir d'une analyse rétrospective d'effondrements de toits similaires. L'espacement ou le nombre de supports hydrauliques nécessaires par unité de surface a été obtenu par l'analyse de l'intervalle et de l'épaisseur d'effondrements de toits. Le seuil d'alerte précoce de la vitesse de séparation verticale de la stratification pour les effondrements de toits à la mine de charbon Muchengjian a été instauré à 14 mm/jour. Le système de surveillance à distance de la séparation des strates récemment inventé a été utilisé pour la première fois pour des alertes précoces d'effondrement du toit. Au total, 48 pratiques d'alertes précoces de chargement du toit ont été réalisées. Il a été déterminé que non seulement les alertes précoces étaient appropriées, mais le système de support était sécuritaire et fiable.
Taking the roadway of a mine in West Mengxi area as the research object, the correlation law between the stress increment of the chamber group and the surrounding rock deformation of the roadway is obtained, and reveals the influence mechanism of adjacent chamber group engineering stress transfer on the deformation of weak cement roadway surrounding rock. The results show that the deformation of the weakly cemented roadway in the adjacent chamber group engineering presents asymmetric and differential characteristics. The properties of surrounding rock, the original rock stress and the chamber group engineering are the main factors of roadway failure; the influence distance of the vertical stress of the surrounding rock in the chamber group engineering area is 7 ~ 12 times the height of the roadway, the stress concentration of the weakly cemented surrounding rock is mainly affected by the vertical stress transmitted from the chamber group engineering area. The vertical stress increment range of the surrounding rock of the adjacent chamber group engineering roadway ranges from 3.2 to 4.8 MPa, compared with the initial in-situ stress which increased by 32–48%, exceeding the critical value of surrounding rock fracture which leading to instability of weak cemented roadways.
In order to solve the coal roof stress analysis and prediction with multiple data information, an expert system is used in this paper. By introducing coal roof stress information forecasting model and expert system model, the MIS can rationally make individual data analysis to multiple data comprehensive analysis, and the coal roof management information system is designed. Experimental analysis shows that the confidence level higher prediction results will be used as the ultimate basis in decision-making if comprehensive objective analysis of data is used for many monitoring data analysis in expert system. The expert-system-based coal roof management information system can effectively solve the shortage of single monitoring data and thus the accurate predict problems of the coal roof stress monitoring data are solved. Keywords-expert system; coal roof pressure data; management information system; prediction modelI.
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