摘要
煤层埋深越大,巷道受采动影响越大,导致巷道顶板出现整体下沉、底鼓、巷帮外鼓等现象。以车集煤矿采用沿空留巷设计后的2901工作面运输巷道为工程背景,主要采用超前锚索补强支护技术来控制回采巷道的变形失稳现象。在原始支护的基础上确定了锚索补强支护的布置方式、支护强度等重要参数,并初步验证了锚索设计参数。通过FLAC^(3D)数值软件对锚索补强支护后的围岩应力分布和塑性区发育规律进行模拟,验证支护设计的效果。模拟结果表明:顶板整体变形较小,顶板支护效果较好。锚索补强支护后的应力峰值比原始支护小。原始支护的回采巷道顶板塑性区发育范围小于锚索补强支护巷道塑性区发育范围。巷道顶板塑性区发育范围明显小于两侧帮部塑性区范围,而且这种差别会随着超前距离的增加而增大。由此表明锚索补强支护区域的岩层具有更好的稳定性。通过数值模拟分析可初步确定锚索补强支护后的巷道稳定性和支护效果良好。本文研究内容可为车集煤矿2901工作面的安全-高效-稳定生产提供重要的基础保障。
The deeper the coal seam is buried,the greater the influence of mining on the roadway,resulting in the overall subsidence of the roadway roof,floor heave,roadway side bulge and other phenomena.Taking the transportation roadway of 2901 working face designed by retaining roadway along goaf in Juji Coal Mine as the engineering background,the leading anchor cable active reinforcement support technology is mainly used to control the deformation and instability of the mining roadway.First of all,on the basis of the original support,the layout of anchor cable reinforcement support,support strength and other important parameters are determined,and the anchor cable design parameters are preliminarily verified.After that,the stress distribution of surrounding rock and the development law of plastic zone are simulated by FLAC^(3D) numerical software to verify the effect of support design.The results show that the overall deformation of the roof is small,and the roof support effect is good.The peak value of stress after anchor cable reinforced support is smaller than that of the original support.The development range of the plastic zone of the roof of the mining roadway supported by the original support is smaller than that of the roadway supported by the reinforced anchor cable.The development range of the roadway roof plastic zone is obviously smaller than that of the slope on both sides,and this difference will increase with the increase of the lead distance.It shows that the rock stratum in the reinforced support area has better stability than that in the reinforced support area.Through numerical simulation analysis,it can be preliminarily determined that the roadway stability and support effect are good after anchor cable support.The research content can provide an important basic guarantee for the safe,efficient and stable production of the 2901 working face in Juji Coal Mine.
作者
曹庆华
杨月飞
陈慧明
刘广伟
CAO Qinghua;YANG Yuefei;CHEN Huiming;LIU Guangwei(Juji Coal Mine of Henan Longyu Energy Co.,Ltd.,Yongcheng 476600,China)
出处
《中国矿业》
2023年第4期133-139,共7页
China Mining Magazine
关键词
沿空留巷
围岩稳定性
锚索
超前支护
变形量
gob side entry retaining
roadway surrounding rock stability
anchor cable
ahead support
deformation displacement
