Zhu Zhijie, Guan Songsong, Tang Guoshui, Chen Kun, Lv Fei
School of Mining, Liaoning Technical University, Fuxin 123000, China.
State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100083, China.
ACS Omega. 2023 Aug 4;8(32):29725-29734. doi: 10.1021/acsomega.3c03995. eCollection 2023 Aug 15.
The bursting liability of coal, referring to the characteristic of coal to accumulate strain energy and produce impact damage, is an important factor influencing the occurrence and extent of rock burst disasters in coal mines. Two indicators-the elastic strain energy storage coefficient and energy release coefficient-are proposed based on the energy evolution characteristics of different stages during rock bursts. Twelve coal specimens from typical mines were selected for uniaxial compressive tests to analyze the damage characteristics of three types of typical coal specimens with different impact damage intensities in different loading stages. The initial kinetic energy of the coal specimens was obtained according to the principle of horizontal projectile motion. The bursting liability rating criteria according to the energy storage coefficient and energy release coefficient were determined based on the damage and motion characteristics of the coal mass, damage acoustic characteristics, and damage initial kinetic energy. The study demonstrated that the discrimination results based on the new criteria of coal mass bursting liability were consistent with the actual bursting liability level of the coal mass, thus providing a new method for determining coal mass bursting liability.
煤的冲击倾向性，即煤体具有积蓄应变能并产生冲击破坏的特性，是影响煤矿冲击地压灾害发生及程度的重要因素。基于冲击地压不同阶段的能量演化特征，提出了弹性应变能存储系数和能量释放系数两个指标。选取典型矿井的12个煤样进行单轴压缩试验，分析不同加载阶段三种不同冲击破坏强度典型煤样的破坏特征。根据平抛运动原理得到煤样的初始动能。依据煤体的破坏及运动特征、破坏声发射特征和破坏初始动能，确定了基于能量存储系数和能量释放系数的冲击倾向性分级标准。研究表明，基于新的煤体冲击倾向性判别标准的判别结果与煤体实际冲击倾向性水平一致，从而为确定煤体冲击倾向性提供了一种新方法。
