基于主应力表征参量的底板破坏影响模拟研究
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摘要
为了研究晋华宫煤矿底板破坏影响程度的问题,依照工程实际采用FLAC~(3D)软件模拟该矿7-4~#煤层开采过程中底板主应力分布及变形情况,应用主应力差和主应力比这2个力学表征参量,分析了一侧采空与两侧采空条件下煤柱底板主应力参量分布规律。数值模拟结果表明,煤柱附近的主应力差呈蝶形分布,采空区周围主应力比以包络圈形式分布。通过对一侧采空与两侧采空底板主应力表征参量的对比分析,发现两侧采空比一侧采空的煤柱附近具有更高的主应力差集中现象,最终得出底板破坏深度可达5 m,影响深度可达43 m,与现场所得数据吻合,验证了用主应力表征参量——主应力差和主应力比来分析底板破坏的合理性。
In order to study the influence degree of the floor failure in Jinhuagong Coal Mine,in accordance with the engineering practice,FLAC~(3D)software was used to simulate the main stress distribution and deformation of the floor during the mining of 7-4~#coal seam.By using the two mechanical parameters of main stress difference and main stress ratio,the distribution of principal stress parameters of coal floor under the conditions of one side mining and two sides mining were analyzed. The numerical simulation results show that the principal stress difference near the coal pillar is butterfly-shaped,and the principal stress ratio around the goaf is distributed in the form of enveloping circle.Through the comparative analysis of the characteristic parameters of the principal stress on the floor on one side and two sides,it is found that there is a higher concentration of principal stress difference near the coal pillar which is excavated on two sides than on one side,finally,it is concluded that the failure depth of the floor can reach 5 m and the influence depth is up to 43 m,which is consistent with the field data,the reasonableness of using principal stress to characterize the parameters,namely,principal stress difference and principal stress ratio to analyze the failure of the floor is verified.
In order to study the influence degree of the floor failure in Jinhuagong Coal Mine,in accordance with the engineering practice,FLAC~(3D)software was used to simulate the main stress distribution and deformation of the floor during the mining of 7-4~#coal seam.By using the two mechanical parameters of main stress difference and main stress ratio,the distribution of principal stress parameters of coal floor under the conditions of one side mining and two sides mining were analyzed. The numerical simulation results show that the principal stress difference near the coal pillar is butterfly-shaped,and the principal stress ratio around the goaf is distributed in the form of enveloping circle.Through the comparative analysis of the characteristic parameters of the principal stress on the floor on one side and two sides,it is found that there is a higher concentration of principal stress difference near the coal pillar which is excavated on two sides than on one side,finally,it is concluded that the failure depth of the floor can reach 5 m and the influence depth is up to 43 m,which is consistent with the field data,the reasonableness of using principal stress to characterize the parameters,namely,principal stress difference and principal stress ratio to analyze the failure of the floor is verified.
引文
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[2]王连国,毕善军,宋扬.底板变形破坏规律的数值模拟研究[J].矿山压力与顶板管理,2004(4):35-37.
[3]高召宁,孟祥瑞,李英明.煤层底板采动应力效应及其力学作用机制研究[J].安全与环境学报,2011(4):201-205.
[4]王卫军,袁越,余伟健,等.采动影响下底板暗斜井的破坏机理及其控制[J].煤炭学报,2014,39(8):1463-1472.
[5]孟祥瑞,徐铖辉,高召宁,等.采场底板应力分布及破坏机理[J].煤炭学报,2010,35(11):1832-1836.
[6]朱术云,姜振泉,姚普,等.采场底板岩层应力的解析法计算及应用[J].采矿与安全工程学报,2007,24(2):192-195.
[7]王连国,韩猛,王占盛,等.采场底板应力分布与破坏规律研究[J].采矿与安全工程学报,2013,30(3):317-322.
[8]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003.
[9]张华磊,王连国,涂敏,等.采动环境下巷道围岩破裂演化规律及其控制技术研究[J].采矿与安全工程学报,2013,30(5):653-664.
[10]牛双建,靖洪文,杨大方.深井巷道围岩主应力差演化规律物理模拟研究[J].岩石力学与工程学报,2012,31(S2):3811-3820.
[11]何富连,王晓明,许磊,等.大断面切眼主应力差转移规律及支护技术[J].岩土力学,2014,35(6):1703-1710.
[12]许磊,张海亮,耿东坤,等.煤柱底板主应力差演化特征及巷道布置[J].采矿与安全工程学报,2015,32(3):478-484.
[13]谢生荣,李世俊,黄肖,等.深部沿空巷道围岩主应力差演化规律与控制[J].煤炭学报,2015,40(10):2355-2360.
[14]何富连,吴焕凯,李通达,等.深井沿空掘巷围岩主应力差规律与支护技术[J].中国煤炭,2014,40(3):40-44.
[15]李建贺,盛谦,朱泽奇,等.Mine-by试验洞开挖过程中围岩应力路径与破坏模式分析[J].岩石力学与工程学报,2017,36(4):821-830.