摘要
为了有效解决目前近距离厚煤层在煤矿开采过程中,存在下覆煤层煤巷掘进成巷速度慢、动压影响大、施工难度大、支护繁琐等问题,本文采用有限差分软件FLAC3D对巷道空间位置选择、锚索预紧力、间排距、长度以及不同区域支护方案等进行数值模拟。通过对锚索支护参数、不同支护方案进行数值模拟研究,分析了其对应的塑性区分布、应力分布、围岩变形特征,形成了一套适用于近距离动压厚煤层沿空掘巷的高效支护技术。研究结果表明:当锚索施加预紧力不低于200 kN时,巷道围岩由二向受拉的应力状态转变为三向的受压状态,提高巷道围岩自身的强度;当锚索间排距布置为1300×2000 mm时,相邻锚索之间产生的压应力叠加区较为明显;当锚索长度为5.3 m时,锚索两端也能较好地形成压应力叠加区域,并且其拉应力集中区域发生了明显缩小,提高了围岩的承载能力。
In order to solve the close thick coal seam in the process of coal mining effectively,such as the slow tunneling speed of the coal roadway in the overlying coal seam,the large impact of dynamic pressure,the large construction difficulty,and the cumbersome support,the finite difference software FLAC3D was adopted to carry out numerical calculation and determine the spatial position of the roadway,the pretension of the anchor cable,the spacing between rows,the length,and the support schemes in different areas.The distribution of plastic zone,stress distribution and deformation characteristics of surrounding rock had been determined through numerical simulation research,and a set of efficient support technology suitable for driving roadways along goaf in close-distance dynamic thick coal seam had been proposed.The research results show that when the pretension applied by the anchor cable is not less than 200 kN,the surrounding rock of the roadway changes from the stress state in the second direction to the compression state in the third direction.When the row spacing between anchor cables is 1300×2000 mm,the superimposed area of compressive stress between adjacent anchor cables is obvious.When the length of the anchor cable is 5.3 m,the compressive stress superposition area is formed at both ends of the anchor cable,the tensile stress concentration area is significantly reduced,and the bearing capacity of the surrounding rock was improved.
作者
梁锋
LIANG Feng(Shandong Energy Zaozhuang Mining Group Sanhekou Mining Co.LTD,Jining,277605,China)
出处
《华北科技学院学报》
2023年第1期16-28,共13页
Journal of North China Institute of Science and Technology
关键词
动压影响
沿空快掘
支护参数
支护技术
dynamic pressure effect
along the empty fast digging
support parameters
support technology
