深部孤岛充填工作面沿空掘巷围岩偏应力演化与控制OA北大核心CSTPCD

Objectives To solve the problem of surrounding rock control in the gob-side driving roadway of the deep island filling working face,Methods taking the 12216 material haulage roadway of Xingdong Mine as the background,the FLAC3D numerical simulation software was used to study the distribution law of the deviatoric stress in the surrounding rock of the gob-side driving roadway under different filling rates in the goaf on both sides of the island face.Additionally,the evolution characteristics of deviatoric stress in the sur-rounding rock of the front section of the working face under the influence of dynamic pressure during the filling mining of the island working face were simulated and analyzed.Results The results showed that:(1)The coal pillar side of the roadway driven along the goaf in the island face was greatly affected by the fill-ing effect of the side goaf.The increase in the filling rate of the side goaf made the peak area of deviatoric stress on the coal pillar take on an elliptical shape and gradually transfer to the side of the goaf.(2)Island filling formed an arc low-value zone towards the side of the goaf in the deviating stress field of the top and bottom of the roadway along the goaf.(3)During the period of dynamic pressure disturbance of island filling,the maximum deviator stress zone was located on the side of solid coal,about 8 m away from the working face,about 4.3 m away from the roadway,and the peak value could reach 34 MPa.Conclusions Combined with the results of numerical simulation analysis,the cooperative support mode of"high-strength bolt+large-diameter and high-elongation anchor cable"was proposed.Field engineering practice showed that the sur-rounding rock control effect of the goaf roadway was good.