沿空工作面冲击危险性动态权重评价方法研究

摘要

Taking 2310 mining face as an example , this paper applied rock-burst start theory to analyzing dynamic load and static load influencing the mining face.Influence factors were confirmed.Using FLAC3D software, stress distribution rule of the mining face along gob in mining was simulated.Rock-burst danger degree of the mining face was obtained by dynamic weight and confidences identify principle.Results showed that intensive static load was main influence factor of rock-burst, stress concentration was obvious at lower end of the mining face.Rock-burst danger degree of this face was weak , which was proved in practice.%以某矿2310工作面为例，采用了冲击地压启动理论对工作面的集中动载和集中静载进行了分析，确定了影响因素；运用FLAC3D 数值模拟，对沿空工作面回采过程中的应力分布规律进行了研究；最后采用动态权重评价方法及置信度识别原则，确定了工作面的冲击危险等级。研究表明，2310工作面冲击影响因素以集中静载为主，在工作面下端头区域应力集中明显，通过评价2310工作面冲击危险等级为弱冲击危险，与现场情况一致，实用性较强。