倾斜岩层巷道围岩大变形分析与控制方法
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摘要
深部倾斜岩层巷道由于围岩应力高,巷道围岩变形周期和变形量都较浅部巷道有显著增加.针对曲江矿-850 m东大巷巷道围岩表现出来的两帮和顶底板的实测不对称大变形特征,采用离散元软件建模分析发现:巷道围岩大变形引起围岩塑性区不断扩大,导致锚杆支护结构失效,由此造成原有等强支护方案不能有效控制巷道变形.结合围岩性能提升和结构强化的思路,提出注浆和不等强支护方案.方案实施后,围岩塑性区半径明显减小,围岩变形速度降低、变形时间缩短,实现了巷道稳定的控制目标.
Deep roadway in inclined strata with the high stress of its surrounding rock,the deformation duration time and the measurement of the surrounding rock are different from shallow roadway. Aiming at the large and unsymmetrical deformation characteristics of roof and floor of the -850 m roadway,this paper uses the discrete element software modeling analysis and finds that the large deformation of surrounding rock of roadway causes the plastic zone increase,and finally leads to structural failure of the bolt support. This may cause the original supporting schemes not to effectively control the deformation of roadway. Taking the performance improvement of surrounding rock and structure reinforcement into consideration,this paper proposes the scheme of grouting and unsymmetrical supporting. After the plan has been implemented,the plastic zone radius of surrounding rock has been significantly reduced. The deformation speed and duration time of surrounding rock have been reduced,achieving the goal of roadway stability control.
Deep roadway in inclined strata with the high stress of its surrounding rock,the deformation duration time and the measurement of the surrounding rock are different from shallow roadway. Aiming at the large and unsymmetrical deformation characteristics of roof and floor of the -850 m roadway,this paper uses the discrete element software modeling analysis and finds that the large deformation of surrounding rock of roadway causes the plastic zone increase,and finally leads to structural failure of the bolt support. This may cause the original supporting schemes not to effectively control the deformation of roadway. Taking the performance improvement of surrounding rock and structure reinforcement into consideration,this paper proposes the scheme of grouting and unsymmetrical supporting. After the plan has been implemented,the plastic zone radius of surrounding rock has been significantly reduced. The deformation speed and duration time of surrounding rock have been reduced,achieving the goal of roadway stability control.
引文
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[2]刘少伟,张辉,张伟光,等.沿顶掘进回采巷道上帮煤体失稳区域预测[J].煤炭学报,2010,35(9):1430-1434.
[3]张农,陈红,陈瑶.千米深井高地压软岩巷道沿空留巷工程案例[J].煤炭学报,2015,40(3):494-501.
[4]勾攀峰,辛亚军,申艳梅,等.深井巷道两帮锚固体作用机理及稳定性分析[J].采矿与安全工程学报,2013,30(1):7-13.
[5]李学华,姚强岭,张农.软岩巷道破裂特征与分阶段分区域控制研究[J].中国矿业大学学报,2009,38(5):618-623.
[6]孙晓明,张国锋,蔡峰,等.深部倾斜岩层巷道非对称变形机制及控制对策[J].岩石力学与工程学报,2009,28(6):1137-1143.
[7]康红普.深部煤矿应力分布特征及巷道围岩控制技术[J].煤炭科学技术,2013,41(9):12-17.
[8]赵延林,曹平,万文,等.岩石裂纹亚临界扩展实验与压剪流变断裂模型[J].中南大学学报(自然科学版),2014,45(1):276-286.
[9]王卫军,袁超,余伟健,等.深部高应力巷道围岩预留变形控制技术[J].煤炭学报,2016,41(9):2156-2164.
[10]Wu H,Zhang N,Wang W,et al.Characteristics of deformation and stress distribution of small coal pillars under leading abutment pressure[J].International Journal of Mining Science and Technology,2015,25(6):921-926.
[11]吴海,张农,王卫军,等.深部倾斜岩层巷道变形特征模拟与控制技术[J].湖南科技大学学报(自然科学版),2013,28(1):6-12.
[12]吴海.深部倾斜岩层巷道非均称变形演化规律及稳定控制[D].徐州:中国矿业大学,2014.