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首页> 外文会议>Joint Japan-Poland Symposium on Mining and Experimental Seismology, Nov, 1999, Kyoto, Japan >An example of usefulness and accuracy of determination of seismic wave attenuation field in a rock mass
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An example of usefulness and accuracy of determination of seismic wave attenuation field in a rock mass

机译：确定岩体中地震波衰减场的有用性和准确性的一个例子

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It is useful to monitor an attenuation field because changes in rock medium physical parameters exert a significant influence on it. However, the attenuation field can only occasionally be reconstructed because the attenuation effect is very sensitive to various disturbing factors. One of the most important is the lack of control of seismic energy emitted by sources. In the surveys, data are collected by a set of receivers placed on the edges of the investigation area. As sources of the seismic waves a series of controlled blasts detonated in various places is used. However, some errors occur because all the sources are not identical. It is therefore very fundamental and important to check the difference by the source. To see the difference two series of measurement were made using six receivers and eleven sources located in the same places with the same coverage of ray paths. As explosion sources the same amount of blasting material in boreholes were used. To avoid any temporal change in attenuation field two series of measurement were carried out within about 2 hours time without the longwall coalface advance rate. The differences in maximum amplitude of seismograms between two series were large, but were accounted for by variation in source energy. However, differences in an area-averaged attenuation were small. For both series an attenuation field was reconstructed based on the inversion of the maximum amplitudes reads with correction of geometrical spreading effects. Generally, differences in attenuation field are not greater than 20% between two series for the most studied area with sufficient coverage of ray-paths.
机译：监视衰减场非常有用，因为岩石介质物理参数的变化会对衰减场产生重大影响。但是，衰减场只能偶尔重建，因为衰减效果对各种干扰因素非常敏感。最重要的问题之一是缺乏对震源发出的地震能量的控制。在调查中，数据是由放置在调查区域边缘的一组接收器收集的。作为地震波的来源，使用了在各个地方引爆的一系列受控爆炸。但是，由于所有来源都不相同，因此会发生一些错误。因此，按源检查差异是非常基本和重要的。为了观察差异，使用位于同一位置，具有相同光线路径覆盖范围的六个接收器和十一个光源进行了两个系列的测量。作为爆炸源，在井眼中使用了相同数量的爆破材料。为了避免衰减场的任何时间变化，在大约2小时的时间内进行了两个系列的测量，而没有长壁煤层推进速度。两个系列之间的地震图最大振幅差异较大，但可通过震源能量的变化来解释。但是，面积平均衰减的差异很小。对于这两个系列，基于最大幅度读数的反演并校正了几何扩展效应，重建了衰减场。通常，对于研究最多且具有足够光路覆盖的区域，两个系列之间的衰减场差异不大于20％。

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