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Micro Seismic Response Characteristics Research of Coal Fracture

Author: LiuZhenGang
Tutor: ChengJiuLong
School: Shandong University of Science and Technology
Course: Safety Technology and Engineering
Keywords: Coal and rock burst Micro-seismic Monitor Spectral characteristics Uniaxial loading
CLC: P631.4
Type: Master's thesis
Year: 2010
Downloads: 135
Quote: 0
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Abstract


Coal or rock dynamic disasters is a major hidden mine safety production , however , the current contact prediction method has obvious limitations . Micro - seismic monitoring method capable of long-range , dynamic , real-time monitoring of coal or rock dynamic disasters risk , this approach is constantly sum up , and constantly improve the micro-seismic rupture in the coal and rock response characteristic aspects of theory and practice aspects of the problem , to be studied and solved. This paper analyzes and summarizes the principles of micro - seismic monitoring of coal and rock burst , and for the lack of traditional monitoring methods , the proposed combination of monitoring methods at the same time using the characteristic parameters of the micro-seismic analysis and spectrum analysis . Uniaxial loading fracture tests, found that the coal and rock deformation and failure of the compaction process native to its internal fissures , closely related to the generation of new fractures , extended through evolution , the characteristic parameters of the micro- earthquake can better reflect the coal rock deformation The destruction and damage evolution characteristics . Spectrum analysis found that the micro- seismic data collected by the micro- seismic signals contained failure process coal and rock spectrum as a function of load and deformation and fracture process changes , basically , with the load increases and the deformation and fracture process enhanced micro- seismic signal enhancement increased frequency signal frequency range narrows , but at peak times , clocked split widens the spectrum and high low-frequency crossover produced by coal-rock destruction , micro- earthquake low frequency change micro-seismic strength weakens . Combined Luxi coal mine geology , micro- seismic events based on actual monitoring data for statistical analysis , and found that the energy of the micro- seismic events no obvious trend has been enhanced ; the micro seismic event clocked basically maintained at about 100Hz , not significantly increased trend frequency range of basic maintenance in the 50- 200Hz ; micro-seismic event occurred only a few points in the work before the party , did not form a dense area of micro - seismic events before the rupture of the coal body , consistent theoretical analysis with the actual monitoring results , to achieve better the effectiveness and credibility . The study showed that the micro- seismic monitoring methods can be broken coal-rock mining conditions to achieve high-precision monitoring .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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