寇规规,高利军,殷聪,等. 浅埋综放工作面过空巷围岩变形规律数值模拟及方法研究[J]. 中国矿业,2023,32(8):123-130. DOI: 10.12075/j.issn.1004-4051.20230366
    引用本文: 寇规规,高利军,殷聪,等. 浅埋综放工作面过空巷围岩变形规律数值模拟及方法研究[J]. 中国矿业,2023,32(8):123-130. DOI: 10.12075/j.issn.1004-4051.20230366
    KOU Guigui,GAO Lijun,YIN Cong,et al. Numerical simulation and method research on deformation law of surrounding rock passing through empty roadway in shallow fully mechanized top coal caving face[J]. China Mining Magazine,2023,32(8):123-130. DOI: 10.12075/j.issn.1004-4051.20230366
    Citation: KOU Guigui,GAO Lijun,YIN Cong,et al. Numerical simulation and method research on deformation law of surrounding rock passing through empty roadway in shallow fully mechanized top coal caving face[J]. China Mining Magazine,2023,32(8):123-130. DOI: 10.12075/j.issn.1004-4051.20230366

    浅埋综放工作面过空巷围岩变形规律数值模拟及方法研究

    Numerical simulation and method research on deformation law of surrounding rock passing through empty roadway in shallow fully mechanized top coal caving face

    • 摘要: 煤矿工作面开采普遍面临过空巷的技术难题,为研究浅埋综放工作面过空巷围岩变形规律,采用FLAC3D数值模拟的研究方法,研究了传统工作面调斜过空巷过程中围岩变形特征,同时提出一种综放面充填过大断面空巷方法,该方法以大断面空巷充填体为底板,通过仰采-平采-俯采三个过程完成工作面过空巷,避免了传统开采调斜、加强支护等难题,实现了工作面连续高效、安全开采。研究结果表明:调斜时在工作面距离空巷16 m时,空巷围岩逐渐受到影响,塑性区贯穿工作面与空巷之间煤柱,并发生破坏,而充填过空巷推进过程中仅在采场中部充填体及仰俯斜段煤体发生小规模破坏,塑性区发育面积较小,采场两端均未发生破坏,工作面调斜过空巷时超前应力最大达25 MPa,侧向应力最大达12 MPa;而充填过大断面空巷时受采动影响小,相比于工作面调斜过空巷超前应力峰值降低10 MPa,侧向应力峰值降低2.5 MPa,从围岩塑性区破坏及采场应力弱化角度证实了该方法的可行性。

       

      Abstract: The coal mines generally face technical difficulties in passing through empty roadway. In order to study the deformation law of the surrounding rock of shallow fully mechanized top coal caving face passing through empty roadway, uses FLAC3D numerical simulation research method to study the deformation characteristics of the surrounding rock during the process of adjusting the inclination of traditional working faces passing through empty roadway. At the same time, a method of filling large cross-section empty roadway in fully mechanized top coal caving face is proposed, which uses the filling body of large cross-section empty roadway as the bottom plate. Through the three processes of upward mining, horizontal mining, and downward mining, the working face passes through the goaf, avoiding difficulties such as traditional mining inclination adjustment and strengthening support, and achieving continuous, efficient, and safe mining of the working face. The research results show that when the working face is 16 m away from the empty roadway during inclination adjustment, the surrounding rock of the empty roadway is gradually affected, and the plastic zone runs through the coal pillars between the working face and the empty roadway, causing damage. However, during the advancement process of filling the empty roadway, only small-scale damage occurs in the filling body and the inclined coal body in the middle of the mining area. The plastic zone has a small development area, and there is no damage at both ends of the mining area. When the working face is inclined and passes through the empty roadway, the leading stress reaches a maximum of 25 MPa. The maximum lateral stress is 12 MPa. However, when filling a large cross-section roadway, the impact of mining is relatively small. Compared to adjusting the inclination of the working face and passing through the roadway, the peak stress in advance is reduced by 10 MPa, and the peak lateral stress is reduced by 2.5 MPa. The feasibility of this method is confirmed from the perspective of the plastic zone failure of the surrounding rock and the weakening of stress in the mining area.

       

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