综放工作面沿空巷道围岩破断机理及支护技术研究
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摘要
针对综放工作面沿空巷道超前段变形严重、支护困难的问题,理论分析了综放沿空巷道上覆岩层断裂结构模式,结合段王煤矿090510工作面的地质条件,确定了沿空轨道巷合理的掘巷位置;采用数值模拟对090510轨道巷在采动作用下的塑性区分布以及应力分布情况进行了分析,得到了轨道巷在回采过程中超前段的主要破坏特征,并探讨了巷道围岩变形机理;提出利用补强机理,采用补打锚索结合超前液压支架对超前段加强巷内支护的方案。现场实践表明:超前段围岩变形较小,有利于实现高产高效且保障了工作面安全生产,为综放工作面超前支护技术提供了示范和参考。
In view of the serious deformation and supporting difficulty of the heading section of the gob-side entry in fully mechanized caving face,the overlying strata fracture structure model of the fully mechanized caving face along the roadway was analyzed theoretically. Combined with the geological conditions of the 090510 working face,the reasonable excavation location of the gob-side track roadway was determined. And the research method of numerical simulation was used to analyze the plastic zone and stress distribution of the 090510 roadway,the main failure characteristics of the track roadway in the advance section in the mining process were obtained,and the deformation mechanism of roadway surrounding rock was studied. Finally,the reinforcement mechanism was put forward,and the scheme of reinforcing the advance section of the roadway with the anchor cable and the advance hydraulic support is adopted. The field practice showed that,the surrounding rock deformation in advance section was small,which was conducive to realizing high yield,high efficiency and ensuring safe production of the working face,the study provided a demonstration and reference for advance support technology of fully mechanized caving face.
In view of the serious deformation and supporting difficulty of the heading section of the gob-side entry in fully mechanized caving face,the overlying strata fracture structure model of the fully mechanized caving face along the roadway was analyzed theoretically. Combined with the geological conditions of the 090510 working face,the reasonable excavation location of the gob-side track roadway was determined. And the research method of numerical simulation was used to analyze the plastic zone and stress distribution of the 090510 roadway,the main failure characteristics of the track roadway in the advance section in the mining process were obtained,and the deformation mechanism of roadway surrounding rock was studied. Finally,the reinforcement mechanism was put forward,and the scheme of reinforcing the advance section of the roadway with the anchor cable and the advance hydraulic support is adopted. The field practice showed that,the surrounding rock deformation in advance section was small,which was conducive to realizing high yield,high efficiency and ensuring safe production of the working face,the study provided a demonstration and reference for advance support technology of fully mechanized caving face.
引文
[1]高峰.王家岭矿综放大断面剧烈采动影响煤巷强化控制研究[D].北京:中国矿业大学(北京),2017.
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[11]李建兵,魏红磊,柏建彪,等.下分层动压巷道失稳机理与加固技术[J].煤矿安全,2013,44(3):40-43.
[2]左建平,孙运江,王金涛,等.大断面破碎巷道全空间桁架锚索协同支护研究[J].煤炭科学技术, 2016, 44(3):1-6.
[3]何富连,张广超.大断面采动剧烈影响煤巷变形破坏机制与控制技术[J].采矿与安全工程学报,2016,33(3):423-430.
[4]李思超,神文龙,刘洋.大断面动压煤巷变形破坏规律及控制技术[J].煤炭技术,2015,34(11):85-87.
[5]陈上元,宋常胜,郭志飚,等.深部动压巷道非对称变形力学机制及控制对策[J].煤炭学报, 2016, 41(1):246-254.
[6]樊克恭,翟德元,刘锋珍.岩性弱结构巷道顶底板弱结构体破坏失稳分析[J].山东科技大学学报(自然科学版),2004,6(2):11-14.
[7]蒋金泉,曲华,刘传孝.巷道围岩弱结构灾变失稳与破坏区域形态的奇异性[J].岩石力学与工程学报,2005,24(18):3373-3379.
[8]陈晓祥,杜贝举,王雷超,等.综放面动压回采巷道帮部大变形控制机理及应用[J].岩土工程学报,2016,38(3):460-467.
[9]余伟健,袁越,王卫军.困难条件下大变形巷道围岩变形机理与控制技术[J].煤炭科学技术,2015,43(1):15-20.
[10]王根盛,张伟,朱友恒,等.大断面煤巷软厚顶板失稳机理与支护控制技术[J].煤矿安全, 2016, 47(7):170-173.
[11]李建兵,魏红磊,柏建彪,等.下分层动压巷道失稳机理与加固技术[J].煤矿安全,2013,44(3):40-43.