Volumetric changes in the focal areas of seismic events corresponding to destress blasting

论文摘要

The typical development of total volumetric change in the focal areas of seismic events, corresponding to destress blasting, is characterized as an explosive phase followed by an implosive phase and with alternating additional phases following on from that. In a few cases, a non-typical development of volumetric change was identified, where the first phase was implosive and the second phase, explosive. This development is mainly typical for induced seismic events recorded during mining, not for destress blasting.Seismic events were recorded during longwall mining in the Czech part of the Upper Silesian Coal Basin, where the destress blasting technique is used as a rockburst prevention active measure.Kinematic source processes in the focal areas of selected seismic events were analyzed by the seismic moment tensor inversion method, as well as by studying geomechanical rock mass conditions at the localities of the seismic events. The main goal of the analysis was to attempt to identify the reasons for non-typical development of volumetric changes in these cases. Volumetric changes were analyzed for seismic events with energy greater than 104 J, recorded in the period of time from 1993 to 2009（1109 events）. 80%（891） of the recorded seismic events were induced seismic events that were registered during longwall mining and 20%（218） corresponded to destress blasting events. Research shows that the main reason for the non-typical development of volumetric changes in the focal areas of seismic events is an association with destress blasting in the rock mass, which is very close to rock mass overstressing. The detonation of explosives in boreholes, which would dominate the first phase of volumetric changes, probably obscured stress release in the rock mass, as manifested in the first implosion phase of the volumetric changes in this case.

论文目录

• 1. Introduction
• 2. Seismological monitoring
• 3. Longwall No.1
• 4. Longwall No.2
• 5. Conclusions

文章来源

类型: 期刊论文

作者: P.Konicek,J.Schreiber,L.Nazarova

来源: International Journal of Mining Science and Technology 2019年04期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 矿业工程

单位: Department of Geomechanics and Mining Research, Institute of Geonics of the Czech Academy of Sciences,Laboratory of Mining Informatics, Chinakal Institute of Mining of the Siberian Branch of the Russian Academy of Science

基金: the project of the Institute of Clean Technologies for Mining and Utilisation of Raw Materials for Energy Use–Sustainability Programme(No.LO1406),supported by a project for the long-term conceptual development of research organisations(No.RVO68145535)

分类号: TD326

页码: 541-547

总页数: 7

文件大小: 4753K

下载量: 3