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Numerical Simulation Research on Optimal Milli-second Delay Time with Many Free Surfaces Hole by Hole Blast

Author: FanXiaoMing
Tutor: GuoLianJun
School: Liaoning University of Science and Technology
Course: Mining engineering
Keywords: Milli-second delay blasting reasonable time interval numerical simulation ANSYS/LS-DYNA
CLC: TD235
Type: Master's thesis
Year: 2012
Downloads: 38
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Abstract


Milli-second delay blasting is one of the main technologies of modern open-pit mines.It plays a key roll in improving the shatter efficiency of rocks and in the aspect of bringing down the influence of blasting vibration. ,this paper on the basis of modern blasting theories,the mechanism of milli-second delay blasting and choice of reasonable mini-interval time are deeply studied. Milli-second blasting was deep studied from two aspects,which was theoretical studying and numerical simulation.In theory, first the study histories and the state of research development of milli-second blasting over the world were introduced briefly, through the damage of rock blasting, damage mechanics of Rock blasting mechanism was deeply studied. then study destroyed behavior of rock under the explosion of rock stress wave. meanwhile analyzes various facts influencing explosion effects.In numerical simulation, dynamical finite element analysis sotfware ANSYS/LS-DYNA was applied,in many free surface ,dynamic stress distribution and its change rule of rock around two holes milli-second delay blasting were computed.the main research parameter changing and time interval to blasting effect. established a series of computations model, After the comparative analysis of the result, the combination of different parameters of stress distribution character had been confirmed, throught the simulation calculation point of adverse break zone some stress response value and the rock against the strength of the comparative analysis, looking for east anshan iron ore′s phyllite reasonable time interval, hole-distance.The paper have important significance to development of blasting in open-pit mines.It provides the instructions of theory and technology for applying the Blasting Technology of“milli-second blasting”,Thus with the applicability innovation and priority,it can be spread and used.

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CLC: > Industrial Technology > Mining Engineering > Mine design and construction > Drilling and blasting works > Blasting
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