The underground mining of coal seams in the Upper Silesian Coal Basin is carried out at great depths and mostly in the presence of remnants or edges of other surrounding coal seams, i.e. under the condition of high stress level in the rock mass. Therefore, this mining is accompanied by rockburst hazard and suitable preventive action is required. Long-hole destress blasting plays an important role and is commonly applied in rockburst prevention in underground hard coal mines. Estimated blasting effectiveness is important when designing rockburst prevention. It is commonly estimated on the basis of the seismic energy of a provoked tremor. The seismic source parameters have already been considered for this purpose. Additional information about the effects of long-hole destress blasting could be contemplated in the planning of active rockburst prevention. The seismic source parameters of tremors provoked by long-hole destress blasting have been calculated and are presented in this article. Destress blasts were performed during the longwall mining of coal seam no. 506 in one of the hard coal mines in the Upper Silesian Coal Basin. They were executed from the longwall face, in order to destress the rock mass ahead of it. Parameters of the blasts were variable and they were modified according to geological and mining conditions and the observed level of rockburst hazard. The seismic source parameters have been determined for tremors provoked directly after firing explosives and for tremors occurring in the waiting time, and they have been compared with each other.

中文翻译：

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变应力条件下煤层长壁开采深孔去应力爆破震源参数

上西里西亚煤盆地的地下煤层开采是在很深的地方进行的，而且大多是在存在其他周围煤层的残余物或边缘的情况下进行的，即在岩体中的高应力水平的条件下。因此，这种开采伴随着岩爆危险，需要采取适当的预防措施。深孔去应力爆破具有重要作用，常用于硬煤矿井下的岩爆防治。在设计岩爆预防时，估计爆破效果很重要。它通常是根据激发的震颤的地震能量来估计的。为此目的已经考虑了震源参数。可以在主动岩爆预防规划中考虑有关深孔去应力爆破影响的其他信息。本文计算并给出了深孔去应力爆破引起的震源参数。在 1 号煤层的长壁开采过程中进行了减压爆破。506 在上西里西亚煤炭盆地的硬煤矿之一。他们是从长壁工作面处决的，以减轻它前面的岩体的压力。爆破参数是可变的，并根据地质和采矿条件以及观察到的岩爆危险程度进行修改。确定了炸药直接激发的震源和等待时间发生的震源参数，