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Energy Distribution Law of Dynamic Failure of Coal-Rock Combined Body
Geofluids ( IF 1.7 ) Pub Date : 2021-02-20 , DOI: 10.1155/2021/6695935
Guangbo Chen 1 , Tan Li 1 , Guohua Zhang 2 , Pengcheng Teng 1 , Bin Gong 3
Affiliation  

The rock burst must be generated by energy. In order to explore the distribution law of energy in coal-rock system, based on the structural characteristics of coal and rock and the mechanical characteristics analysis of coal-rock combined body model, the calculation formula of energy distribution was given before the damage of same diameter coal-rock combine body and nonsame-diameter coal-rock combined body; the uniaxial compression experiments were carried out on the combined body, and the energy distribution before the failure of the combined body was calculated by using the energy distribution calculation formula. The results show that the greater the difference in hardness between the components of the combined body, the stronger the outburst proneness; the energy mainly accumulates on the weak component before the combined body is destroyed, and the hard components act as a clamping device. When the soft layers and the hard rock layers are interbedded, the energy accumulation ability of the soft rock layer is stronger than that of the hard rock layer, and the weak rock layer is the main carrier of energy accumulation. According to this, from the perspective of energy accumulation layer, for the energy-bearing structure, direct release energy and indirect release energy two kinds of rock burst prevention and control concepts and corresponding antiburst measures were proposed. At the same time, engineering practice, microseismic monitoring, and on-site measurement were conducted in Junde Coal Mine. The results show that the blasting pressure relief for the weak coal seam and the hard roof destroys the energy-bearing structure formed by the fine sandstone-coal-fine sandstone and effectively releases the energy and has a remarkable antiscour effect.

中文翻译:

煤岩结合体动力破坏的能量分布规律

岩石破裂必须由能量产生。为了探讨煤岩体系中能量的分布规律,基于煤岩结构特征和煤岩结合体模型的力学特性分析,给出了煤岩体系破坏前的能量分布计算公式。直径煤岩结合体和非等径煤岩结合体。对组合体进行了单轴压缩实验,利用能量分布计算公式计算了组合体破坏前的能量分布。结果表明,组合体各部件之间的硬度差越大,突出倾向就越强。能量主要是在组合体被破坏之前积累在薄弱的部分上,硬部件充当夹紧装置。当软岩层和硬岩层互层时,软岩层的能量累积能力强于硬岩层,而软岩层是能量累积的主要载体。据此,从蓄能层的角度出发,针对含能结构,提出了直接释放能量和间接释放能量两种岩爆的防治概念和相应的防爆措施。同时,在骏德煤矿进行了工程实践,微震监测和现场测量。
更新日期:2021-02-21
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