Influential range of advanced abutment pressure of N2106 working face in Yuwu coal industry
In the mining process of working face,the change of advance abutment pressure will have a greater impact on the stability of roof strata.In order to study the influential range of advanced abutment pressure on the front rock stratum of working face,taking the N2106 working face of Yuwu Coal Industry as the engineering background,the borehole stress was measured on the spot,the relationship between the stress and the distance from the working face was analyzed,and the FLAC numerical calculation model was established.The failure law of the roof strata and the vertical supporting stress varia-tion law of the strata in front of the working face under different advancing distances are analyzed.The results show that the influential range of the stress of the working face is 56.5 m,and the stress increases rapidly when the distance from the working face is 14.4 m.When the distance from the working face is 8 m,the stress reaches the peak value of 32.57 MPa,and the stress increment is 27.8 MPa;When the working face advances forward 52 m,the horizontal distance between the fractured zone and the working face is about 8 m,which corresponds to the sharp increase of the measured stress meter value when the distance is 8 m from the working face,and the maximum height of the fractured zone is about 60 m from the verti-cal distance of the working face,which is close to the 56.5 m of the stress influential range of the working face.The maxi-mum value of stress concentration coefficient and vertical bearing stress is 31 MPa at 10 m from the front of the working face,which is close to the peak 32.57 MPa meas-ured by the stress meter.
advance abutment pressurestress gaugeFLACnumerical calculationfracture zone
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