考虑峰后能量非稳态释放的硬煤脆性度指标

doi:10.13722/j.cnki.jrme.2017.0523

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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。

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	郝宪杰1
	2
	3
	袁亮4
	5
	郭延定3
	李玉麟3
	赵毅鑫3
	王新中3
	朱广沛3
	卢志国3
	任波5

关键词 ：采矿工程, 能量, 脆性度指标, 应力&ndash, 应变曲线

Abstract：The post peak stress-strain curves of coal are often presented curved and benched drop. The current brittleness index expressed by gradient drop of compressive stress-strain cannot distinguish the linear，curved and benched drop. A new index to characterize the brittleness of hard coal based on unsteady energy release is thus proposed to overcome the problem. The brittleness of coal is the parameter characterizing the speed of energy release under the action of minute external energy in the post-peak stage. The mechanical and geometrical models of brittleness index were established according to the energy accumulation in pre-peak stage and the energy release in post-peak stage，which were validated theoretically and experimentally subsequently. Finally，the classification of bursting liability of coal according this index is studied. The results indicated that，compared with other indexes，this index can consider the longer nonlinear elastic phase of the hard coal，the shorter plastic and post-peak benched drop characteristics and so on.

Key words： mining engineering energy brittleness index stress-strain curves

引用本文:

郝宪杰1，2，3，袁亮4，5，郭延定3，李玉麟3，赵毅鑫3，王新中3，朱广沛3，卢志国3，任波5. 考虑峰后能量非稳态释放的硬煤脆性度指标[J]. 岩石力学与工程学报, 2017, 36(11): 2641-2649.
HAO Xianjie1，2，3，YUAN Liang4，5，GUO Yanding3，LI Yulin3，ZHAO YiXin3，WANG Xinzhong3，ZHU Guangpei3，LU Zhiguo3，REN Bo5. A new brittleness index for hard coal considering unsteady energy release at post-peak stage. , 2017, 36(11): 2641-2649.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0523 或 http://www.rockmech.org/CN/Y2017/V36/I11/2641

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