Fracture Mechanism of Key Layers in Coal Mining Engineering Based on Overlying Rock Movement Law
With the advancement of coal mining engineering,mine earthquake in coal mine area seriously threatens the safety of workers.In order to monitor the safety of coal mining engineering,the movement law of the overlying strata in Gucheng Coal Mine was analyzed.On this basis,the relationship between the seam roof crack and mining engineering was dug out by deeply studying the influence of the overlying strata movement on the key strata of the coal seam in Gucheng Coal Mine.The numerical simulation results showed that the sedimentation rate curve increased first and then decreased overall.In the early monitoring period,the sedimentation rate was larger,which was 6.28 mm/d in February.The later settlement rate was about 5.37 mm/d,which was still relatively high,and the settlement rate showed a downward trend,which was steep in the early stage and gradually gentle in the later stage,indicating that the surface settlement gradually decreased with the passage of time and finally entered the slow settlement period.The roof of deep coal seam often forms several key levels,and coal seam mining is easy to cause the cooperative activities of several key levels.There is no thick rock layer within a hundred meters above the mining area.After mining,the overlying rock breaks,sinks,and moves sufficiently,which is consistent with the normal movement pattern of the strata.Overall,there is no possibility of large-scale suspended roof occurrence.The research has certain reference value for solving safety issues in coal mining engineering.
overburden movement lawcoal mining engineeringkey layerfracture mechanism