首页|基于微震多参数的大规模岩体垮塌前兆特征研究

基于微震多参数的大规模岩体垮塌前兆特征研究

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微震监测技术能进行工程岩体失稳垮塌前兆特征的辨识和分析，对于地质灾害预警防控具有重要意义。本文基于已有室内岩石受压损伤破坏声发射实验规律，通过开展现场微震多参数定量分析，探究了柿竹园矿山6·21大爆破诱发山体滑移垮塌的前兆特征。大爆破诱发微震事件的b值和空间分形维数表现出下降趋势，b值急剧下降和分形维数降到最低可作为工程岩体失稳垮塌的前兆特征。此外，能量指数和累计视体积的变化可以分别表征应力和应变的变化。能量指数快速下降和累计视体积持续增加的组合特征反映了岩体的失稳状态。经过多个失稳破坏阶段后岩体发生最终的失稳垮塌。该案例表明微震监测能为工程岩体失稳垮塌的预警和防控提供重要信息，也为涉及爆破作业的诸多地质工程活动的安全监测提供了参考。
Precursory characteristics of large-scale rockmass collapse based on multiple microseismic parameters
Microseismic monitoring is vital for identification and analysis of precursory characteristics of rockmass failure and collapse,which is of great significance for geological hazard early warning and management.By conducting a quantitative analysis of multiple microseismic parameters based on previous insights from laboratory acoustic emission experiments,we investigate the precursory characteristics of large-scale rockmass collapse associated with the large blast in Shizhuyuan Mine on 21 June,2012.Both the b-value and spatial fractal dimension exhibit a decreasing trend,and the sharp decrease of b-value and the continuous decline of fractal dimension serve as two discernible precursors of rockmass failure.Besides,the variations in the energy index and cumulative apparent volume reflect the dynamics of stress and strain,respectively.The combination of a decrease of energy index against an increase of cumulative apparent volume also indicates the unstable state of rockmass,and this process may repeat before the final rockmass collapse.This case study demonstrates the significance of microseismic monitoring in providing valuable information for early warning and management of rockmass collapse.This work also provides insights for the safety monitoring of various geological engineering activities involving blasting operations.

microseismic monitoringrockmass collapseprecursory characteristicsearly warning

柳建新、杨顺、李磊、潘新朋、尹贤刚、胡静云、彭府华

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Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha 410083,China

Hunan Key Laboratory of Nonferrous Resources and Geological Hazard Exploration,Changsha 410083,China

School of Geosciences and Info-Physics,Central South University,Changsha 410083,China

Changsha Institute of Mining Research Co.,Ltd.,Changsha 410012,China

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微震监测 岩体垮塌 前兆特征 预警

国家自然科学基金Natural Science Foundation for Excellent Young Scholars of Hunan Province,ChinaCentral South University Innovation-Driven Research Programme,ChinaNatural Resources Science and Technology Project of Hunan Province,China

421308102022JJ200572023CXQD0632022-01

2024

10.1007/s11771-024-5610-y

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(3)
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