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  赵艳红,包金哲,王树波,翟浩,魏建民,杨智升,张晖,赵铁锁,苏日亚,王磊,王鑫,贾昕晔,刘芳.基于波形特征的露天钼矿微震事件的识别分析——以卓资山钼矿为例[J].震灾防御技术,2019,14(3):662-676, DOI:10.11899/zzfy20190318.

基于波形特征的露天钼矿微震事件的识别分析——以卓资山钼矿为例
摘要:    基于前人研究成果以及现场的实测结果,采用卓资山露天钼矿微震监测项目产出资料,提取了5类微震事件的波形特征和时频特征。波形特征显示:微地震的振幅、辐射均匀性和频率变化特征表明微地震是由于岩层受到单力偶和剪切力作用破裂而产生;爆破具有P波初动方向向上、S波不易识别的特点,包含“初震段、主震段、尾波段”三段变化形态;小型边坡滑坡波事件属楔体滑坡,是由多个“加速—缓冲—终止”构成,波形是由包络线呈“V”字形的多组脉冲波列组成;机械开采震动事件具有自振能量不变、脉冲幅度相差很大、持续时间间隔不确定的特点;运输车辆波形振幅具有形态“弱—强—弱”、等频率、包络线呈多段纺锤形的特征。时频空间分布可以分为相对独立、界限分明的两类:一类包含微地震、爆破、机械开采、小型边坡滑坡事件,另一类只包含车辆运输事件。
作者单位
赵艳红 内蒙古自治区地震局, 呼和浩特 010010 
包金哲 内蒙古自治区地震局, 呼和浩特 010010 
王树波 内蒙古自治区地震局, 呼和浩特 010010 
翟浩 内蒙古自治区地震局, 呼和浩特 010010 
魏建民 内蒙古自治区地震局, 呼和浩特 010010 
杨智升 内蒙古自治区地震局, 呼和浩特 010010 
张晖 内蒙古自治区地震局, 呼和浩特 010010 
赵铁锁 内蒙古自治区地震局, 呼和浩特 010010 
苏日亚 内蒙古自治区地震局, 呼和浩特 010010 
王磊 内蒙古自治区地震局, 呼和浩特 010010 
王鑫 内蒙古自治区地震局, 呼和浩特 010010 
贾昕晔 内蒙古自治区地震局, 呼和浩特 010010 
刘芳 内蒙古自治区地震局, 呼和浩特 010010 
关  键  词:卓资山露天钼矿  微震事件  时频特征
DOI:10.11899/zzfy20190318
基金项目:中国地震局地震科技星火项目(XH18012),中国地震局“三结合”课题(CEA-JC/3JH-170609X),内蒙古自治区科技重大专项“基于微震定位技术的重点工程监测系统的应用示范研究”
收稿日期:2018-10-24
作者简介:赵艳红,女,生于1979年。工程师。主要从事大震速报、地震编目等工作。E-mail:530001094@qq.com
通讯作者:刘芳,女,生于1953年。高级工程师。主要从事地震监测预报工作。E-mail:lfnm88@163.com
Identification and Analysis of Micro-earthquake Events in Open-pit Ore Area Based on Waveform Characters——A Case Study of Zhuozishan Molybdenum Mine
Abstract:      Based on the previous research results and the field measurements, taking Zhuozishan open-pit molybdenum mine as an example, we analyzed the waveform and time-frequency characteristics of five kinds of micro-seismic events in the region. The amplitude, radiation uniformity and frequency variation of the microearthquakes show that the microearthquakes are caused by the single force couple and shear force. The blasting has a upward P wave initial direction, whereas the initial direction of S wave is not easy to identify, characterized with three section changes of initial earthquake, main shock and tail band". The event of small slope landslide belongs to wedge-body landslide, and the total process is composed of several so-called acceleration-buffer terminations, in which the waveform is composed of multiple sets of pulse wave trains with "V" shape of envelope line. The vibration event of mechanical mining is characterized by constant natural vibration energy, great difference in pulse amplitude and uncertain duration interval. The wave amplitude of the transport vehicle has the shape of "weak-strong-weak", equal frequency and multi-segment spindle shape. The time-frequency spatial distribution can be divided into two categories. The first contains micro-earthquakes, blasting, mechanical mining and small slope landslides, and the second contains only vehicle transport events. The research results provide a reference for the identification of microseismic events in open pit mines.
Keywords:  Zhuozishan open-pit molybdenum mine  Microseismic events  Time-frequency characteristics
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