考虑峰后能量非稳态释放的硬煤脆性度指标

发布时间：2018-11-23 10:21

【摘要】：针对现有基于压缩应力应变曲线峰后跌落斜率指标无法区分直线式、弧线式、台阶式跌落的缺点,提出基于能量非稳态释放理论的硬煤脆性度指标。煤的脆性度是煤体到达峰值后在外部很少能量作用下,煤体内所蕴藏的能量释放快慢的表征参数。通过研究煤峰前能量积聚过程和峰后能量非稳态释放规律,建立硬煤脆性度指标的力学和几何模型,并进行理论和试验验证,最后利用该指标研究煤冲击倾向性的脆性分区。结果表明,与其他指标相比,该指标可以充分考虑硬煤相对较长的非线性弹性阶段、较小的塑性段、峰后台阶跌落等特征,数形结合,具有直观性和易算性,也更能体现出硬煤的脆性度差异。
[Abstract]:In view of the disadvantage that the existing drop slope index based on the compression stress and strain curve can not distinguish the linear type, the arc type and the step type, the brittleness index of hard coal based on the theory of unsteady release of energy is put forward. The brittleness of coal is the characteristic parameter of energy release in coal body after reaching the peak value under the action of little external energy. The mechanical and geometric models of brittleness index of hard coal were established by studying the energy accumulation process before and after the peak and the law of unsteady energy release after the peak. The mechanical and geometric models of brittleness index of hard coal were established and verified theoretically and experimentally. Finally, the brittleness zoning of coal impact tendency was studied by using this index. The results show that compared with other indexes, this index can fully take into account the relatively long nonlinear elastic stage of hard coal, the smaller plastic section, the drop of the step after the peak, and the combination of numbers and shapes, which is intuitive and easy to calculate. Also can reflect the brittleness difference of hard coal more.
【作者单位】：中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;辽宁工程技术大学辽宁省煤炭资源安全开采与洁净利用工程研究中心;中国矿业大学(北京)资源与安全工程学院;安徽理工大学;煤炭开采国家工程技术研究院;
【基金】：北京市自然科学基金项目(8174072) 辽宁工程技术大学辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金项目(LNTU16KF08) 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM16KFB07)~~
【分类号】：TD313

【相似文献】