基于能量传递效率的煤冲击倾向性评价指标

Evaluation index of bursting liability of coal based on energy transfer efficiency

  • 摘要: 冲击地压与煤体能量的积聚和释放密切相关,能量传递是评价冲击倾向性的关键参数之一。通过构建能量源扰动条件下的能量传递模型,关联冲击能量指数与弹性能量指数,提出能量释放比例φ,基于传递过程中的能量耗散模型提出了能量传递效率β,建立了包含2种参数的冲击倾向性评价方法。对煤矿11个煤层分层进行冲击倾向性鉴定试验,引用79个煤矿分层的冲击倾向性鉴定结果进行可靠性验证。结果表明:能量释放比例φ具有冲击地压边界条件的意义;能量传递效率β与泊松比具有负相关性,取值范围可以由模型边界条件推导获得;能量传递指数η的计算结果,与冲击倾向性鉴定的结果具有较高的一致性(88.61 %),能够反映煤体的冲击倾向性,并且可以成为“*”结果的评价依据,是一种适用于现有冲击倾向性评价体系的有效指标。

     

    Abstract: The accumulation and release of energy in coal are closely linked to rock burst, with energy transfer being a key parameter for evaluating bursting liability. This study constructs an energy transfer model under energy source disturbance conditions, where we establish a relationship between impact energy index and elastic energy index, propose the proportion of energy φ, introduce the concept of energy transfer efficiency β based on an energy dissipation model during the transfer process, develop an evaluation method for bursting liability by multiplying two efficiency parameters η=βφ. We conducted experiments to identify bursting liability of 11 coal layers from 3 pairs of coal mines, whose reliability was verified by referencing results from 79 layered impact tendency identifications in other coal mines. Results show that 1)the proportion of energy release φ has boundary conditions with physical significance for ground pressure; 2)there is negative correlation between the efficiency β and Poisson's ratio which can model boundary conditions; 3)calculation results of the energy transfer index η show high consistency(88.61 %)with bursting liability identification results, reflecting the bursting liability of coal bodies. It can serve as a basis for evaluating "*" outcomes and is an effective indicator suitable for existing systems used to evaluate bursting liability.

     

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