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为研究采动影响下活动断层的滑移情况,以抚顺矿区老虎台矿为背景,建立了采动条件下覆岩运动的突变力学模型,确定了断层发生滑动的必要条件;运用UDEC数值模拟软件对工作面开采条件下断层活动进行分析,现场工业性试验对断层活动进行监测和验证。结果表明,断层失稳的必要条件为刚度值k≤1,刚度比随着开采深度的增加而逐渐降低;当弹性段采出厚度大于85 m时,F25断层具备了发生滑动的必要条件,易发生冲击地压。83003工作面开采后,F25断层下盘位移基本不变,上盘位移活动幅度较大,最大位移达到了5~7m;锚索测力计的应力变化与断层活动具有较大的相关性,当锚索测力计数值突变时,表明断层已经活动,锚索测力计数值突变越大,预示冲击地压和矿震能量越大。
In order to study the slip of active faults under the influence of mining, a catastrophic mechanical model of overlying strata movement under mining condition was established based on the background of Laohutai mine in Fushun mining area, and the necessary conditions for slip occurred were determined. UDEC numerical simulation software The analysis of fault activity under the conditions of working face mining and the on-site industrial test monitored and verified the fault activity. The results show that the necessary condition for the fault instability is the stiffness value k≤1, and the stiffness ratio decreases gradually with the increase of the mining depth. When the thickness of the elastic section is greater than 85 m, the F25 fault has the necessary conditions for slip. Rock burst. 83003 After mining face, the displacement of the lower disc of F25 is basically unchanged, the displacement of upper disc is larger, and the maximum displacement reaches 5 ~ 7m. The stress variation of the cable dynamometer has a great correlation with the fault activity. When the value of anchor load-bearing force count suddenly changes, it shows that the fault has been active. The greater the sudden change of load-bearing index value, the larger the impact ground pressure and mine-induced energy.