敏东一矿软岩回采巷道底鼓机理及控制对策

针对敏东一矿软岩回采巷道底鼓严重的问题,采用实验室实验、数值模拟和现场监测等方法,研究了回采巷道底板矿物成分及采动应力对底板变形破坏影响,揭示了软岩回采巷道底鼓机理,并提出了锚杆加固回填支护对策.研究结果表明:巷道底板破坏程度会因与距工作面距离不同而呈现差异化特征,距工作面越近时,采动影响越剧烈,底板破坏程度越高,且会...

Mechanism and control countermeasures of floor heave in soft rock mining roadway in Mindong No. 1 Mine

In response to the serious problem of the bottom heave of the soft rock mining roadway in Mindong No. 1 Mine，mineral composition analysis, numerical simulation and on-site monitoring methods are used to analyze the deformation and failure laws of the floor under the influence of mining, reveal the mechanism of the floor heave phenomenon in the roadway, and propose reasonable control countermeasures. The research results show that: (1) the floor contains a large amount of mineral components such as illite and montmorillonite that are easy to swell in contact with water, and the floor is a water-swellable bottom heave; (2) the closer the roadway is to the working surface, the more severe the impact of mining, The damage of the bottom plate becomes more and more serious, and the bottom plate bulges under the action of the higher stress of the two sides; (3) The type of the bottom drum of the 06 working face transportation along the trough is water swelling + mining-induced squeezing fluidity composite bottom drum. Therefore, according to the bottom heave law and the bottom heave mechanism of the 06 working face along the trough, the over-excavated bolt reinforcement backfill support proposal is put forward.