摘要
结合现场观测成果,对某矿三采区相向掘进沿空动压巷道(12306轨道巷)顶板及巷帮的变形特征进行了分析,认为巷道顶板和煤柱侧巷帮变形量较大,实体煤侧巷帮变形量较小,巷道变形呈现不均称特征。结合12306轨道巷变形特征分析,认为该巷道原支护方案中锚杆选型、锚杆支护密度、钢筋梯安装角度均不合理。根据上述分析,设计了3种锚杆支护方案(方案Ⅰ、Ⅱ、Ⅲ),并进行了数值模拟分析。研究表明:方案Ⅰ对于巷道围岩稳定性的控制效果最优,即12306轨道巷合理的支护方案应为采用规格为22 mm×2 200 mm无纵筋左旋螺纹钢锚杆支护,顶板与实体煤侧巷帮锚杆端头锚固,锚杆间排距为800 mm×800 mm;右帮锚杆全长锚固,锚杆间排距为600 mm×800 mm,靠近顶板位置的锚杆与水平方向呈20°夹角安装。
Based on the actual monitoring results,the deformation characteristics of roof and twosides of the gob-side roadway（12306 track roadway） influenced by dynamic pressure and excavated in opposite direction in the three mining area of a coal mine is analyzed,it is show that the deformation of the roof and two-sides of roadway are both large,while the deformation of two-sides of roadway is small,deformation of the roadway is characterized by heterogeneity. According to the roadway deformation characteristics of 12306 track roadway,the deficiencies of the original supporting scheme of the roadway is discussed,it is indicated that the anchor rob type selection,anchor rob supporting density and installation angle of steel ladder of the original supporting scheme are unreasonable,it is necessary to be optimized.Based on the above study results,three supporting schemes（scheme Ⅰ,Ⅱ,Ⅲ） based on anchor rob are designed,and the corresponding numerical simulation results are analyzed. The study results show that the optimal roadway stability controlling effects can be obtained by adopting scheme Ⅰ,therefore,the reasonable supporting scheme of the roadway can be described that the roadway surrounding rock can be effectively supported by adopting the left-handed screw steel anchor rob without longitudinal reinforcement,its technical parameters is 22 mm × 2 200 mm,the ends of anchor rob in roadway roof and entity coal seam side are anchored,the anchor rob density is 800 mm × 800 mm,the whole long of the anchor rob in the right side of roadway is anchored,the anchor rob density is 600 mm × 800 mm,the angle of the installation direction of anchor rob near the roadway roof and horizontal direction can be determined as 20°.
作者
李强
Li Qiang(Hexi Coal Mine, Shanxi Fenxi Mining Grou)
出处
《现代矿业》
CAS
2018年第3期27-30,共4页
Modern Mining
关键词
井巷支护
沿空动压巷道
巷道变形特征
锚杆支护
Mine supporting, Gob-side roadway influence by dynamic pressure, Roadway deformation characteristics, Supporting by anchor rob
