冲击危险性动态预测的震动波CT技术研究

Dynamic risk assessment of rock burst based on the technology of seismic computed tomography detection

针对煤矿冲击灾害日益频繁的现状,在应力与纵波波速的试验关系模型基础上,分析了采用纵波波速确定冲击危险的理论基础,建立了冲击危险性动态预测评价的震动波CT探测的技术,构建了震动波CT探测评价冲击危险性技术指标波速异常系数A n和波速梯度变化系数VG,并给出了各指标的判别准则,最后开展了现场应用。研究结果表明,对于同一性质的岩体,纵波波速反映了冲击矿压发生的强度条件、能量条件和动载诱冲条件;震动波CT探测技术能够对现场冲击危险性做出动态评价和预测,并能对卸压解危措施的实施和效果进行指导和检验。

On account of increasingly frequent rock burst hazards at present, the theoretical basis of rock burst determi- nation through P-wave velocity was analyzed based on the experiment relation model of stress and P-wave velocity. Meanwhile, the technology of rock burst risk assessment was established through seismic computed tomography detection,which contains assessment parameters of wave velocity anomaly An and wave velocity gradient anomaly VG. The criterion of these parameters was documented. Finally, the assessment technology was verified by practical application. The results show that P-wave velocity reflects the strength criterion, energy criterion and dynamic load criterion for rock burst as for the rock mass with the same properties. The seismic computed tomography detection technology is feasible for rock burst risk assessment. It can give guidance on the implement of risk relief measures and check the effect of the measures.