Digital Simulation Study on Dimensions of Pressure Relief Groove on Deep Roadway Floor
With the continuous increase of coal mining depth,many domestic mines have entered deep mining,the stability of deep roadway surrounding rock is poor,the phenomenon of floor heave is prom-inent,and the mine pressure is obvious.Based on the engineering background of a coal mine in Pingding-shan mining area,the deformation and failure characteristics of the roadway surrounding rock were ana-lyzed,and a combined support scheme of"four-level shotcrete + three-level wire rope mesh + three-level anchor bolt + floor relief trough + wall grouting"was proposed.The distribution characteristics of the stress field of the roadway surrounding rock were calculated using UDEC.It can effectively ensure the stress trans-fer of roadway floor to the depth.When the width of pressure relief groove is 1 600 mm,the plastic zone of roadway floor surrounding rock is 14.84 m,and the peak horizontal stress of roadway floor is transferred to the depth by 14.5 m,which provides certain theoretical support for the deformation control of roadway deep surrounding rock.
deep miningpressure relief grooveUDEC numerical simulationsurrounding rock stress fieldplastic zone
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