| The change of rock mechanical properties and the irregularity of ground stress are always accompaning deep mine mining.To solve such problems in deep well mining,what counts is the monitoring and early warning,management and control of ground pressure.This paper takes the ground pressure monitoring and early warning technical improvement project of Yunnan Huize lead-zinc mine and the in-situ rock stress measurement project of Dashuijing lead-zinc phosphate rock as the engineering background.The main research contents are as follows:Acoustic emission localization technology is used in the laboratory to study the spatiotemporal distribution characteristics and damage evolution characteristics of micro-fracture sources in rock specimens during uniaxial compression loading failure process.By constructing a microseismic monitoring system in the mine,we use microseismic monitoring technology to analyze the microseismic monitoring data information,and study the law of mine ground pressure activity.In order to management and control methods for large-scale rock mass destruction such as activities,by means fractal theory,we are based on the study of acoustic emission localization parameters and microseismic monitorin's localization parameters.We analysis and summary the evolution mechanism of ground pressure activities in deep mines and the spatial and temporal distribution characteristics of rock mass rupture based on monitoring and early warning system.Based on the MATLAB software,firstly,the numerical simulation analysis of the parameter information obtained by the monitoring system is carried out.Then,the mathematical physical distribution of the energy field in the mine range is inverted.Finally,the distribution characteristics of the energy field dissipation cluster in the mine range are discussed.In summary,by the comparative analysis of the temporal and spatial distribution characteristics of the monitoring and early warning system monitoring results,the variation law of ground pressure activities in deep well mining is comprehensively verified.The main conclusions are as follows:Based on the analysis and research of the basic data of mine engineering,the microseismic monitoring system is established and the sensor array layout is optimized,which provides an effective technical means for mine disaster monitoring and early warning.Through the indoor rock acoustic emission test,a series of changes in the internal crack initiation and propagation of rock samples and the variation of fractal dimension are revealed.The rock damage energy and inversion process are studied,and the close correlation between the energy release process and the damage area and the degree of damage is obtained and then the validity of the energy inversion data analysis is proved.The fractal dimension of mine microseismic events is calculated and analyzed by MATLAB software.The consistency of rock mass failure process and fractal dimension value reduction is verified.The temporal and spatial distribution characteristics of microseismic monitoring events and their correlation with on-site ground pressure activities are obtained. |
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