煤柱挖潜开采影响下断层活化危险性研究

Study on danger of fault activation under potential excavation of coal pillar

为研究防水煤柱挖潜开采影响下断层活化突水机理及危险性,以荆各庄矿F3断层为例,采用力学理论分析及数值模拟分析,建立了煤柱挖潜开采影响下断层活化力学模型、力学判据、数值分析模型,分析了断层活化影响因素,对F3断层活化危险性进行了判定,最后利用钻孔压水试验验证了判定结果。研究表明:煤柱挖潜开采影响下断层活化的主要因素有断层的富水性、断层倾角、断层带特性、断层所处的位置等,F3断层活化指数为-3.81×105,小于0,断层不会出现活化,此结论通过数值模拟分析及现场钻孔压水试验得到验证。

In order to study the water inrush mechanism and danger of the fault activation under the potential excavation of the coal pillar,based on Fault F3 in Jinggezhuang Mine as an example,the mechanics theoretical analysis and numerical simulation analysis were applied to establish the mechanics model,mechanics criterion,numerical analysis model and to analyze the factors affected to the fault activation.A judgement was conducted on the danger of the Fault F3 activation and finally a pressurized water test of the borehole was applied to verify the judgement results. The study showed that under the potential excavation of the coal pillar,the main factors of the fault activation under the potential excavation of the coal pillar would be the watery of the fault,inclination of the fault,fault zone features,location of the fault and others. The activation index of Fault F3was-3.81×10^5and less than 0. The fault would not be activated and the conclusion was approved by the numerical simulation analysis and the site pressurized water test of the borehole.