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为定量研究岩石中速度误差或偏差对声发射源定位精度的影响,分别就一维线和二维平面情况下岩石中声发射源定位情况进行试验。对于线定位,采用花岗岩岩杆,对于平面问题,采用正方体大理岩,用铅笔芯折断的声音模拟声发射源。为比较线定位与平面定位的精度,在大理岩上表面的中线上进行线定位。从速度的多次测量结果来看,线定位的速度变异系数较平面定位各个方向要小。研究发现,对于线定位,绝对距离最大误差在0.8cm左右,当速度相差200m/s时,绝对距离定位误差相差0.4cm左右;对于平面定位,在传感器30cm的阵列情况下,绝对距离定位高达5cm,甚至8.7cm,可见,平面定位速度严重影响定位精度;平面定位误差较线定位误差大,说明在工程实际中,能用线定位解决的问题尽量不用面定位;与常规认识不一致的是,平面定位中6个方向速度的平均值的定位精度不是最小的,而对角线上速度的均值的定位精度最小。
In order to quantitatively study the influence of velocity error or deviation in rock on the location accuracy of acoustic emission sources, the location of acoustic emission sources in rocks under one-dimensional and two-dimensional planes are tested respectively. For line positioning, the use of granite rock, for plane problems, the use of square marble, broken with a pencil core analog sound emission source. In order to compare the accuracy of line positioning and plane positioning, line positioning is performed on the midline of the marble upper surface. From the speed of the measurement results of view, the speed of line positioning coefficient of variation than the plane orientation in all directions to be small. The study found that the absolute maximum error of line positioning is about 0.8cm, and when the speed difference is 200m / s, the absolute distance positioning error is about 0.4cm; for plane positioning, the absolute distance is up to 5cm , Or even 8.7cm, it can be seen that the positioning speed of the plane positioning seriously affects the positioning accuracy; the positioning error of the plane positioning error is larger than the positioning error of the line, indicating that the problems that can be solved by using the line positioning as far as possible without the plane positioning in the engineering practice are inconsistent with the conventional recognition. The average positioning accuracy of the six directional velocities in positioning is not the least, while the average of diagonal velocities has the lowest positioning accuracy.