深部回采工作面超前应力演化研究

Study on advanced stress evolution of deep stope

为研究超前应力分布对深部工作面开采的影响,以平岗煤矿底部层33^(#)层右一面为工程背景,结合理论分析、数值模拟和现场实测等方法,开展了采动影响下工作面超前区域的应力演化研究。结果表明:理论模型计算得出,在工作面煤壁前方8.53 m处超前支承应力峰值为20.71 MPa;数值模拟结果得出,工作面煤壁前方9 m左右峰值应力保持在20.7 MPa左右;钻孔应力计现场实测,工作面煤壁前方8.8 m处应力峰值为21.59 MPa,三者结果基本一致。该研究结果可为工作面超前支护以及巷道围岩控制初始设计提供支持。

This paper is intended to investigate the influence of advanced stress distribution on deep mining.The study building on the first right working face of the 33^(#)coal at the bottom layer of Pinggang coal mine as the engineering background conducts a research into stress evolution in the leading area under the mining influence by theoretical analysis,numerical simulation,and field measurement.The results show that by theoretical model calculating,the peak value of advanced supporting stress at 8.53 m in front of the coal wall is 20.71 MPa;by numerical simulation,the peak stress at about 9 m in front of the coal wall stays at about 20.7 MPa;and by the field measurement of the borehole stress meter,the peak stress at 8.8 m in front of the coal wall of the working face is 21.59 MPa.The three results are basically consistent.The research results can provide support for the advanced support of working face and the initial design of roadway surrounding rock control.