大采深强冲击倾向性小煤柱沿空巷道支护技术研究
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摘要
针对高家堡煤矿4号特厚煤层采深大且具有强冲击倾向性,现有支护方案不能满足巷道围岩控制的问题,根据首采工作面支护效果现场实测数据,基于整体耦合让压设计理念,确定锚杆(索)合理支护参数,确定沿空巷道小煤柱合理参数,提出"高强预应力蛇形让压锚杆+鸟窝耦合让压锚索+强力护表构件"联合支护技术,巷道最大顶底板移近量为126mm,移近率3.71%,两帮平均移近量198.3mm,平均移近率3.97%。监测数据表明:支护方案可满足大采深强冲击倾向性巷道控制要求,有效保证了工作面安全生产。
To large mining depth and strengthen impact tendency of No. 4 extra thickness coal seam of Gaojiabu coal mine,roadway surrounding rock control problems could not be met by the now available supporting scheme,according field practical data of the first working face supporting results,based on design concept of total coupling yield design,bolt and cable parameters were confirmed,also small coal pillar parameters of gob-side entry was confirmed,and then combined supporting technology that high pretension snake type yield blot and bird nest coupling yield cable and intensity surface protection components was put forward,the largest convergence from roof to floor was 126 mm,movement ratio was about 3. 71%,and average of two sides was 198. 3 mm,movement ratio was about3. 97%. The monitoring data showed that supporting scheme could meet roadway control demand,and safety production was ensured effectively.
To large mining depth and strengthen impact tendency of No. 4 extra thickness coal seam of Gaojiabu coal mine,roadway surrounding rock control problems could not be met by the now available supporting scheme,according field practical data of the first working face supporting results,based on design concept of total coupling yield design,bolt and cable parameters were confirmed,also small coal pillar parameters of gob-side entry was confirmed,and then combined supporting technology that high pretension snake type yield blot and bird nest coupling yield cable and intensity surface protection components was put forward,the largest convergence from roof to floor was 126 mm,movement ratio was about 3. 71%,and average of two sides was 198. 3 mm,movement ratio was about3. 97%. The monitoring data showed that supporting scheme could meet roadway control demand,and safety production was ensured effectively.
引文
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[2]成云海,姜福兴,胡兆锋,等.埋深千米综放采场沿空巷道冲击地压防治研究[J].采矿与安全工程学报,2016,35(S1):3000-3007.
[3]潘俊锋,连国明,齐庆新.冲击危险性厚煤层综放开采冲击地压发生机理[J].煤炭科学技术,2007,35(6):87-90.
[4]秦四清,何怀锋.狭窄煤柱冲击地压失稳的突变理论分析[J].水文地质工程地质,1999(5):17-20.
[5]姜福兴,王建超,孙广京,等.深部开采沿空巷道冲击危险性的工程判据[J].煤炭学报,2015,40(8):1729-1736.
[6]姜鹏飞,张剑,胡滨.沿空留巷围岩受力变形特征及支护对策[J].采矿与安全工程学报,2016,33(1):56-62.
[7]许永祥.特厚煤层大采高综放面沿空掘巷支护技术[J].煤矿开采,2017,22(2):51-55,77.
[8]许永祥.特厚煤层大采高综放面沿空掘巷技术研究[D].焦作:河南理工大学,2012.
[9]樊克恭,马池帅,王亚军,等.深井大断面沿空掘巷围岩支护技术研究[J].煤矿开采,2015,20(2):43-46.
[10]康红普,王金华,林健.煤矿巷道锚杆支护应用实例分析[J].岩石力学与工程学报,2010,29(4):649-663.
[11]康红普,王金华,林健.高预应力强力支护系统及其在深部巷道中的应用[J].煤炭学报,2007,32(12):1233-1238.
[12]康红普,林健,吴拥政.全断面高预应力强力锚索支护技术及其在动压巷道中的应用[J].煤炭学报,2009,34(9):1153-1159.