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为防止深部较软煤层发生动力灾害,以平煤股份二矿为工程背景,采用应力实时监测系统测试了深部工作面采动应力场,研究了工作面走向和倾向应力分布及变化规律,分析了应力对煤体稳定性及动力现象的影响,并探讨了工作面可能发生的动力灾害。结果表明,工作面上部(靠近采空区)超前采动影响距离、煤帮内应力集中范围、应力集中系数及应力峰值较大,工作面两端应力规律差异较大。应力峰值和应力梯度变化显著影响煤体的稳定性;通过监测工作面应力变化,可对工作面动力现象进行预测预报;工作面可能发生的动力灾害是应力起主导作用的压出灾害。
In order to prevent the occurrence of dynamic disasters in the softer coal seams in the deep area, the mining stress field in the deep working face was tested with the stress real-time monitoring system based on the engineering background of the No. 2 Mine of Pingdingshan Coal Mine. The stress distribution and variation of the working face direction and tendency were studied. Stress on the stability and dynamic phenomenon of coal, and explores the possible dynamic disaster on the working face. The results show that the upper mining face (near the goaf) affects the mining distance, the internal stress concentration range, the stress concentration coefficient and the stress peak are large in the coal gangue, and the stress laws at both ends of the working face are quite different. The change of stress peak and stress gradient significantly affect the stability of coal. By monitoring the change of working face stress, the dynamic phenomenon of working face can be predicted and predicted. The possible disasters of working face are stress disasters leading to stress.