Research on Roof Cutting and Pressure Relief Technology of Dense Borehole in Adjacent Mining and Adjacent Excavation of Dynamic Pressure Roadway
In order to solve the problem that the roadway is difficult to maintain due to the influence of strong dynamic pressure in the adjacent mining and adjacent excavation of roadway,the methods of theoretical analysis,numerical simulation and field deformation measurement of roadway were used to study the roof cutting and pressure relief technology of 100302 return airway in Tanyaoping Coal Industry.The results are drawn as follows.Firstly,after the dense boreholes are arranged at the roof of the roadway in the advanced working face,when the working face advances to the vicinity,the mining pressure makes the plastic zone of the adjacent boreholes run through to form a directional weak zone.After the working face is pushed through,the roof breaks along the directional weak zone in time,which can achieve the purpose of roof cutting and pressure relief.Secondly,the key parameters of roof cutting and pressure relief of dense boreholes are determined,and the average dynamic load coefficient is introduced to optimize the traditional formula of dense borehole spacing.Thirdly,after the roof cutting and pressure relief of dense boreholes,the peak stress curve of coal pillar decreases as a whole in the process of adjacent mining and adjacent excavation.The fluctuation peak of roof cutting occurs in advance,the fluctuation range decreases,and the fluctuation peak decreases,with the decrease of 22.1％,19.9％and 19.1％respectively.The field monitoring results show that the surrounding rock of the driving roadway in the adjacent working face is within the controllable range after the roof cutting and pressure relief of the dense borehole.
Adjacent mining and adjacent excavationStrong dynamic pressureDense boreholeRoof cutting and pressure releasing
万方数据
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