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深部厚覆岩矿井强震震源机制与诱冲能力评估

Evaluation of focal mechanism and inducing burst ability of large energy mine earthquakes in deep thick overburden mine

  • 摘要: 深部厚覆岩矿井在采掘期间常面临矿震频发现象,其中大能量矿震可能诱发冲击地压现象。为探究强震诱冲能力,以鄂尔多斯矿区门克庆煤矿3106工作面为工程背景,基于矩张量力学机制修正了强震垂直高度,分析了强震时空分布特征,结合钻孔资料探究了临空侧强震频发的影响因素;同时基于矩张量反演方法研究了厚覆岩条件下强震的力学类型及震源机制。结果表明:强震由工作面生产帮一侧的低位厚覆岩层破断产生,震源机制主要呈现拉伸破断型,少数为压缩破断型。基于震动波衰减规律,建立了强震衰减模型,将3106工作面回采期间产生的12次强震划分成3种类型;并根据现场支护条件及开采条件建立了FLAC3D数值模型,采用动力计算方法获取了3106工作面临空侧巷道所能抵抗的质点峰值振动速度(peak particle vibration velocity,PPV)为0.35 m/s;进一步根据建立的能量E、传播距离r和PPV关系模型,计算分析确定除第2种类型对巷道有一定影响之外,其他2种类型的强震诱冲能力都偏弱,阐释了现场没有发生破坏的原因。研究结果为类似厚覆岩条件下强震产生机制及诱冲能力分析提供了理论支撑。

     

    Abstract: Deep thick overlying strata mine often faces frequent occurrence of mine earthquake during mining, among which large energy mine earthquakes may induce rock burst. In order to investigate the burst inducing ability of large energy earthquakes, based on the engineering background of the 3106 working face of Menkeqing Coal Mine in Ordos mining area, the vertical height of large energy mine earthquakes is modified based on the moment tensor mechanics mechanism, the temporal and spatial distribution characteristics of large energy mine earthquakes are analyzed, and the factors influencing the frequent occurrence of large energy mine earthquakes near the goaf side are explored combined with drilling data. Based on the moment tensor inversion method, the mechanical types and focal mechanisms of large energy mine earthquakes under the condition of thick overlying strata are studied. The results show that the large energy mine earthquake is caused by the fracture of the low thick overburden on one side of the production wall of the working face, and the focal mechanism is mainly tensile fracture type, and a few are compression fracture type. Based on the attenuation law of vibration wave, the large energy mine earthquake attenuation model is established, and the 12 large energy mine earthquakes produced during the mining of 3106 working face are divided into three types. The FLAC3D numerical model is established according to the field support and mining conditions, and the peak particle vibration velocity (PPV) of the roadway near the goaf side of 3106 working face is 0.35 m/s by using the dynamic calculation method. Further, according to the established relationship model of energy E, propagation distance r and PPV, the calculation and analysis confirm that except the second type has a certain influence on the roadway, the other two types of the large energy mine earthquake burst inducing ability is weak, which explains the reason why there is no damage at the site. The research results provide theoretical support for the generation mechanism and induced burst ability analysis of large energy mine earthquakes under similar thick overburden conditions.

     

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