邱集煤矿1102工作面切顶留巷支护设计及矿压实测
Support design and mine pressure measurement of 1102 working face in Qiuji Coal Mine
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摘要: 以邱集煤矿1102工作面运输巷坚硬顶板支护问题为背景,建立未切顶巷道顶板的悬臂梁模型和切顶留巷顶板的变形及受力模型;由理论计算得出切顶前巷道顶板伸向采空区的悬臂梁结构的最大悬臂长度为4.68 m,切顶后悬吊单位长度的巷道顶板所需支护阻力为166.74 kN;据此进行巷道支护参数设计,确定恒阻大变形锚索规格为?准17.8 mm×10 300 mm,两列锚索排距分别为1 000 mm和2 000 mm,并对巷道矿压进行监测。监测结果表明:1102运输巷距开切眼75 m至173 m范围内巷道顶底板移近量最大值约36 mm,顶板离层出现在泥岩灰岩的交界处,累计离层量为25 mm,顶板锚索受力最大值为150 kN,变形和受力均处于安全范围内,满足巷道的稳定性要求。Abstract: Take the background of hard roof support problem of Qiuji Coal Mine 1102 working face haulageway, the cantilever beam model of uncutting roadway roof and the deformation and stress model of gob-side entry retaining are established. The maximum cantilever length of roadway roof cantilever beam structure is 4.68 m by theoretical calculation; the support resistance of the roadway roof with unit length suspended is 166.74 kN. Based on this, the parameters of roadway are designed, the specification of constant resistance and large deformation anchor cable is determined as ?准17.8 mm × 10 300 mm, and the spacing of two columns of anchor cable to be 1 000 mm and 2 000 mm respectively, and the roadway mine pressure is monitored. Monitoring results show that: within the range of 75 m to 173 m from the open-cut hole in 1102 haulageway, the maximum displacement of roadway roof and floor is about 36 mm, the roof abscission layer occurs at the junction of mudstone and limestone, the accumulative amount of abscission layer amount is 25 mm, the maximum stress of roof anchor cable is 150 kN, both deformation and stress are within a safe range, meet the stability requirement of roadway.
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