Zaozhuang Mining Industry Group Jining Qiwu Coal Industry Co.

为得出软弱夹层厚度对巷道围岩稳定性影响规律,以3上712工作面运输巷为工程背景,采用数值模拟和现场监测等综合研究方法,研究了不同软弱夹层厚度与巷道围岩变形特征及应力分布之间关系,并对3上712工作面运输巷提出了支护优化措施。结果表明,随着软弱夹层厚度的增加,巷道顶板上方下位坚硬岩层区域应力值逐渐减小,巷道顶板塑性区破坏面积逐渐增大;且不同软弱夹层厚度会导致不同的顶板破裂形态,巷道含软弱夹层顶板出现了明显的非连续破坏,顶板破裂区具有明显的隔层扩展特性。经现场实践,巷道位移量在40d后基本趋于稳定,巷道的顶板、两帮及底鼓量分别达到53mm、46mm、41mm,有效控制了巷道围岩变形量。

In order to obtain the influence law of weak interlayer thickness on the stability of the roadway surrounding rock, taking the transportation roadway of the 3upper712 working face as the engineering background, comprehensive research methods such as numerical simulation, on-site monitoring and others are used to study the relationship between different thicknesses of weak interlayer and the deformation characteristics and stress distribution of the roadway surrounding rock. Support optimization measures are proposed for the transportation roadway of the 3upper712 working face. The results show that as the thickness of the weak interlayer increases, the stress value in the lower position hard rock layer area above the roadway roof gradually decreases, and the plastic zone failure area of the roadway roof gradually increases; Moreover, different thicknesses of weak interlayer can lead to different forms of roof fracture. The roadway contains the weak interlayer roof occurs obvious discontinuous damage, and the fractured zone of the roof has obvious characteristics of interlayer expansion. Through on-site practice, the displacement amount of the roadway tends to stabilize after 40 days, and the roof, two sides, and heaving floor amount of the roadway reach 53 mm, 46 mm, and 41 mm respectively, effectively controlling the deformation amount of the roadway surrounding rock.