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Numerical Simulation of the Top-coal Caving Law under Vibration Condition

Author: DingGuoZuo
Tutor: WeiJinPing
School: Henan Polytechnic University
Course: Mining engineering
Keywords: Top coal caving Exciting Arching Granular flow
CLC: TD823.49
Type: Master's thesis
Year: 2011
Downloads: 27
Quote: 0
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Abstract


The successful implementation of release top coal is in top coal caving key arching phenomenon when the top coal greater when the top coal caving process seriously affect the release of top coal effect . Currently , the top coal into the bracket tail , to improve liquidity and broken arch stagnation flow active intervention the block top coal caving aspects is relatively limited , the paper analysis based on block top coal caving arch the exciting breaking arch to improve top coal caving effect of particle flow numerical simulation to analyze the factors affecting top coal exciting flow effect method of determining the optimal excitation parameters . Let coal in the top risk exposure to ethyl alcohol. Experiments arch mechanism , based on analysis by an arch shape , particle flow code to simulate the the top coals body size and space distribution layer bit low caving support to cover the angle of the beam and the top coal the coefficient of friction between the block on top coal effect , according to the analysis of the contact stress between the blocks , combined with top coal caving variation of the kinetic energy of the process block , to verify the presence of caving into arch reveals arching top coal caving caving characteristics - under the influence of the broken arch pulse ; based on quadrature analysis the impact of the above factors on the top coal caving law , show that the top of the coal body scale affect top coal into the key factors of the arch , and the bulk distribution space in the top coal horizons important factors that influence coal Caving chunk of the top layer of coal bits determine the top coal recovery effect . Sample coals natural frequency range of laboratory determination based on the combination of fully mechanized caving face support stability , security and analysis of the impact of the top coal supporting effect of stent-related components , the top coal bracket cover of beam parts low-frequency , low - amplitude excitation broken arch , improve caving effect principle . Orthogonal numerical simulation analysis of the distribution of top coal degree horizon , the excitation frequency and amplitude of the three factors that affect the maximum contact stress variation in the amount of top coal body under the top coal caving obtained the effective excitation frequency and amplitude the amplitude of the range , to verify the low - amplitude, low-frequency excitation to improve the top coal release of the validity of the effect . On this basis , the effective excitation Qinshui Coalfield hard top coal caving parameters were optimized .

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CLC: > Industrial Technology > Mining Engineering > Mining > Coal mining > Underground mining methods > Wall mining method > Caving Mining Method
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