摘要
为研究断层附近最大主应力对断层活化失稳的影响,以济三煤矿KF76断层为工程背景,利用FLAC3D软件建立数值分析模型,分别在断层上下盘进行开挖模拟,分析随着工作面的推进断层附近最大主应力方向和大小的变化。结果表明:断层随工作面的推进活化趋势不断增大,在断层下盘开挖时,工作面距断层40 m,断层发生活化;随着工作面向断层推进,断层附近最大主应力偏转与集中现象不断加剧,范围不断扩大;与断层上盘相比,在断层下盘开挖工作面,最大主应力偏转与集中现象均更加明显,影响范围更大,更易引起断层活化失稳。
To explore the effect of maximum principal stress near fault on fault activation instability, this paper takes KF76 fault of Jisan Mine as the engineering background, uses FLAC3 Dsoftware to build a numerical analysis model to carry out the excavation simulation on the upper and lower plates of the fault respectively and analyze the changes in the direction and magnitude of the maximum principal stress near the fault with the advance of the working surface. Research shows that: the trend of fault activation increases with the advancing of working face, when the footwall is excavated, the working face is 40 m away from the fault, the fault is active; the maximum principal stress deflection and concentration near the fault are intensified and the range is enlarged with the advancing of working face towards the fault; compared with the hanging wall of the fault, in the foot wall mining, the maximum principal stress deflection and concentration are more apparent, the influence range is larger, and the activation of the fault is more likely to occur by the mining of the foot wall.
引文
[1]李志华,窦林名,曹安业等.采动影响下断层滑移诱发煤岩冲击机理[J].煤炭学报,2011,36(增1):68-73.
[2]孔宪森.峰峰矿区采动断层滑移数值模拟研究[D].徐州:中国矿业大学,2017:1-2.
[3]朱广安,窦林名,刘阳,等.采动影响下断层滑移失稳的动力学分析及数值模拟[J].中国矿业大学学报,2016,45(1):27-33.
[4]林远东,涂敏,刘文震,等.基于梯度塑性理论的断层活化机理[J].煤炭学报,2012,37(12):2060-2064.
[5]张海东.断层破碎带宽度对逆断层活化规律影响的模拟研究[J].煤炭工程,2018,50(1):96-99.
[6]丁可,郭嘉兴.断层落差影响下采动应力变化规律研究[J].煤炭技术,2018,36(10):69-71.
[7]包冉,李凯.断层落差对逆断层活化规律影响的模拟研究[J].煤矿安全,2017,48(5):46-52.
[8]杨随木,张宁博,刘军,等.断层冲击地压发生机理研究[J].煤炭科学技术,2014,42(10):6-9.
[9]赵善坤,张宁博,王永仁,等.逆冲断层下冲击危险煤层采场矿压规律试验研究[J].煤炭科学技术,2015,43(10):61-66.
[10]王涛,姜耀东,赵毅鑫.断层活化与煤岩冲击失稳规律的实验[J].采矿与安全工程学报,2014,31(2):180-186.
[11]焦振华.采动条件下断层损伤滑移演化规律及其诱冲机制研究[D].徐州:中国矿业大学,2017:31-32.
[12]高琳.工作面开采正断层活化规律及采动应力演化特征[D].青岛:山东科技大学,2016:2-3.
[13]孔朋,蒋金泉,王普.正断层两盘不同开采顺序的支承应力演化规律[J].煤矿安全,2017,48(10):65.
[14]韩磊,孟祥瑞,张小康.采动影响下断层附近矿压显现规律的相似模拟试验研究[J].煤炭工程,2014,46(7):74-77.
[15]关正西,李跃明,中原一郎.弹性力学手册[M].西安:西安交通大学出版社,2014:67-68.