开滦矿区深部开采中巷道围岩稳定性研究

在对开滦矿区赵各庄矿、唐山矿深部开采过程中巷道围岩变形、破坏特征和矿井动力显现观测的基础上,结合数值模拟研究发现:(1)开滦矿区在千米深开采时水平构造应力远大于自重应力,原岩应力值远大于巷道围岩强度值,巷道将不可避免地要遭受破坏并表现为大变形强流变和严重底鼓;(2)随着开采深度增大,软弱煤岩层发生冲击地压的危险性随之增大,通常以煤层的整体突出为特征,其发生机理和高应力状态下硬岩(煤)中的岩爆有区别;(3)原岩应力状态对巷道围岩的变形破坏有着重要影响,而巷道形状对巷道围岩的破坏形式影响不大。

STUDY ON SURROUNDING ROCK STABILITY OF DEEP MINING IN KAILUAN MINING GROUP

Based on the observation and numerical simulation of roadway failure in deep mining,it is found that the horizontal tectonic stress is much greater than the original vertical rock stress and the in-situ stress is beyond the strength of rock surrounding roadway in Kailuan mining area. Thus,the large deformation of roadway and catastrophic floor heave are deemed to be inevitable. With the increasing of mining depth,coal bumps become more severe and violent. Translatory coal bumps are the main dynamic hazards in deep mining of Kailuan mining group,which have different mechanism compared to the rock bursts happened in hard rock under large-scale in-situ stress. Furthermore,it is noticed that the fracture zone of surrounding roadway is mainly influenced by the in-situ stress. However,the roadway shape has little effects on the fracture zone of surrounding roadway.