Analysis of energy release in impact instability damage of briquette model
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摘要: 为定量计算冲击地压发生时伴随的能量释放量,本文设计了型煤模型单轴压缩实验,采用高速摄影仪实测了煤柱压溃时抛射体的弹射速度,计算获得煤柱破坏时的能量释放情况;对模型破坏前后能量变化进行了有限元计算,考虑一定比例的能量耗散后,基于能量守恒原理,得到煤柱破坏时碎块弹射速度的理论统一值,实测结果与理论值基本接近;证明了模型实验中破坏煤块的弹射速度与实际采场煤柱破坏时碎块弹射速度相同。Abstract: A large number of energy can be released in coal bumpsIn order to quantitatively calculate energy released amount,the uniaxial compression singlepressure experiment of coal briquette model was carried out,and the ejection velocity of coal pillar in damage was measured by the highspeed photography to obtain energy release situation in failure of coal pillarIn addition,the amount of energy release is calculated by finite element method before and after destruction of the modelTaking into account a certain proportion of energy dissipation,the theoretical ejection velocity of coal pillar can be calculated by energy conservation principle,and the theoretical value is in good agreement with the measured valueFinally,this paper proves that the ejection velocity of coal fragments in failure measured from experiment is the same as the ejection velocity in failure from engineering practice
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