Abstract: To prevent the occurrence of dynamic disaster in deep soft coal seam, based on the engineering background in No.2 Coal Mine of Pingdingshan Tianan Coal Co. Ltd., the mining-induced stress field in the deep workface was measured by using the stress real-time monitoring system, and the distribution and variation of stress along strike and inclination was studied. In addition, the effect of stress on coal stability and dynamic phenomena was further analyzed, and the dynamic disasters which may occur in this workface were discussed. The results show that in the upper part of workface, which is approaching the gob-side, the influencing distance of advanced mining-induced stress, the stress concentration range within the roadway coal sidewalls are larger, and the stress concentration factor and peak value of stress are higher. The stress distribution and variation is quite different between the head and end of the workface. Moreover, the variation of peak stress and stress gradient significantly influence the stability of coalmass. Because the main disaster probably occurred at the workface is extrusion disaster controlled by the stress, the dynamic disasters can be fore casted by monitoring the stress changes at the workface.

Key words: mining-induced stress monitoring, stress distribution, dynamic phenomenon