软弱夹层对金矿深部巷道围岩稳定性影响研究

Study on the Influence of Weak Interlayer on the Stability of Surrounding Rock in Deep Roadway of Gold Mine

含软弱夹层巷道围岩稳定性是黔西南金矿深部开采过程中遇到的一大难题。为保障矿山安全高效生产,采用FLAC3D模拟软件建立不同软弱夹层产状对巷道围岩稳定性影响的分析模型,研究巷道埋深、软弱夹层倾角和位置对巷道工作面稳定性的影响。结果表明:随着埋深的增加,巷道围岩变形量和塑性区体积均逐渐增大;当软弱夹层倾角在0°~40°范围内时,随着倾角的增加,巷道围岩变形量和塑性区体积均逐渐增大;当软弱夹层倾角大于0°时,巷道表面位移呈现不对称性:左拱肩>右拱肩,左帮>右帮,左拱脚<右拱脚,且随着角度的增大,这种不对称性更加明显;随着软弱夹层距巷道顶板距离的增加,巷道表面位移逐渐减小,巷道不对称变形的程度变小,围岩的塑性区体积逐渐变小。研究结果可为类似巷道工程支护提供一定的参考依据。

The stability of roadway surrounding rock with weak interlayer is a major problem encountered in the deep mining process of Qianxinan Gold Mine.In order to ensure the safe and efficient production of the mine,the FLAC3D simulation software was used to establish an analysis model of the influence of different weak interlayer occurrences on the stability of roadway surrounding rock.The influences of buried depth of roadway and dip angle,as well as position of weak interlayer on the stability of roadway working face were studied.The results show that with the increase of buried depth,the deformation of surrounding rock and the volume of plastic zone increase gradually.When the dip angle of the interlayer is within the range of o°-40°,as the dip angle increases,the deformation of the surrounding rock and the volume of the plastic zone in the roadway gradually increase.When the dip angle of the weak interlayer is greater than 0°,the surface displacement of the roadway exhibits asymmetry:left arch shoulder>right arch shoulder,left slope>right slope,left arch foot<right arch foot,and this asymmetry becomes more obviously with the increase of angle.As the distance between the weak interlayer and the roof of the roadway increases,the surface displacement of the roadway gradually decreases,the degree of asymmetric deformation of the roadway decreases,and the volume of the plastic zone of the surrounding rock gradually decreases.The research results can provide a certain reference for similar roadway engineering support.