某矿软岩回采巷道围岩支护优化分析
|
摘要
针对某矿K3煤层回采巷道具体地质情况,提出了不同的巷道支护方案,通过理论计算得出了支护的参数,运用FLAC 3D数值模拟软件分别对无支护条件下、原支护条件下、现支护条件下的巷道进行数值模拟,分析巷道围岩变形、塑性区分布特征得知:底板自钻式中空注浆让压锚杆+顶板、两帮高强度金属粗尾让压锚杆+W型钢带+金属网+鸟窝让压锚索高强度锚杆+锚索+两帮角锚杆(10°)+两底板锚杆联合支护,巷道最大底鼓量为155 mm,巷道两帮的变形量在100 mm,巷道的底鼓问题能得到有效控制,实现安全生产的目的。
According to the specific geological conditions of the mining roadway in K3 coal seam of a mine, different roadway support schemes are put forward. The parameters of support are obtained through theoretical calculation. The roadway without support, under original support and under existing support conditions are simulated by FLAC 3 D numerical simulation software. By analyzing the distribution characteristics of surrounding rock deformation and plasticity zone, there is combined support of bottom self-drilling hollow grouting pressure-relief bolt + roof, two sides of high-strength metal thick tail pressure-relief bolt + W-shaped steel belt + metal mesh + bird nest pressure-relief anchor cable + anchor cable + two-sided angle bolt(10 °) + two bottom plate bolt. The maximum floor heave is 155 mm, the deformation of two sides of roadway is 100 mm, and the floor heave is 100 mm. The floor heave problem of roadway can be effectively controlled to realize the safe production.
According to the specific geological conditions of the mining roadway in K3 coal seam of a mine, different roadway support schemes are put forward. The parameters of support are obtained through theoretical calculation. The roadway without support, under original support and under existing support conditions are simulated by FLAC 3 D numerical simulation software. By analyzing the distribution characteristics of surrounding rock deformation and plasticity zone, there is combined support of bottom self-drilling hollow grouting pressure-relief bolt + roof, two sides of high-strength metal thick tail pressure-relief bolt + W-shaped steel belt + metal mesh + bird nest pressure-relief anchor cable + anchor cable + two-sided angle bolt(10 °) + two bottom plate bolt. The maximum floor heave is 155 mm, the deformation of two sides of roadway is 100 mm, and the floor heave is 100 mm. The floor heave problem of roadway can be effectively controlled to realize the safe production.
引文
[1]倪超.芦岭矿软岩巷道底板失稳原因分析及控制技术[J].科技资讯,2014(7):59-63.
[2]郭志飚,王炯,张跃林,等.清水矿深部软岩巷道破坏机理及恒阻大变形控制对策[J].采矿与安全工程学报,2014(6):945-949.
[3]郝朋伟.高应力软岩巷道锚杆支护的数值模拟[D].淮南:安徽理工大学,2016.
[4]李亚林.薄煤层上行开采顶板巷道围岩稳定性研究[D].重庆:重庆大学,2017.
[5]胡海.缓斜煤层群跨采底板上山的合理布置与支护[D].重庆:重庆大学,2016.
[6]李学彬,杨仁树,高延法,等.杨庄矿软岩巷道锚杆与钢管混凝土支架联合支护技术研究[J].采矿与安全工程学报,2015(2):285-290.
[2]郭志飚,王炯,张跃林,等.清水矿深部软岩巷道破坏机理及恒阻大变形控制对策[J].采矿与安全工程学报,2014(6):945-949.
[3]郝朋伟.高应力软岩巷道锚杆支护的数值模拟[D].淮南:安徽理工大学,2016.
[4]李亚林.薄煤层上行开采顶板巷道围岩稳定性研究[D].重庆:重庆大学,2017.
[5]胡海.缓斜煤层群跨采底板上山的合理布置与支护[D].重庆:重庆大学,2016.
[6]李学彬,杨仁树,高延法,等.杨庄矿软岩巷道锚杆与钢管混凝土支架联合支护技术研究[J].采矿与安全工程学报,2015(2):285-290.