煤体受拉破坏演化规律与失稳灾变特征研究[1]
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1.中国矿业大学 安全工程学院;2.华亭煤业集团东峡煤矿;3.杨河煤业有限公司;4.中国矿业大学 深地工程智能建造与健康运维全国重点实验室

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TD 315

基金项目:

国家重点研发计划资助(2022YFC3004705);国家自然科学基金(52104234);江苏省自然科学基金(BK20210504);江苏省高等学校大学生创新创业训练计划项目(202210290133Y)


Experimental study on the energy evolution law and destabilization damage characteristics of coal body under tension process
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China University of Mining and Technology, School of Safety Engineering

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    摘要:

    为研究煤炭开采过程诱发的煤岩动力灾害防控问题,开展了原煤试样巴西劈裂试验,研究了受拉破坏过程中煤体的能量演化规律,对煤体失稳破坏的前兆信息进行了判识。结果表明:煤体受拉破坏过程具有显著的非线性演化特征,能够判识煤体破坏的临界点、失稳点、破坏点;受拉损伤破坏各阶段,煤体的能量演化特征差异显著,在弹性变形阶段,输入能主要转化为弹性能,耗散能保持稳定,而在失稳破坏阶段,耗弹比呈跳跃式增长;求解能量释放速率与能量耗散速率,结果表明该指标在煤体受拉过程的临界点、失稳点、破坏点处均具有异常响应特征,且特征点的出现均有显著的前兆信息。煤岩失稳破坏的本质是能量积聚与耗散的结果,煤体能量指标能够揭示试样损伤破坏过程中能量演化的异常特征,进而判识煤体发生灾变的前兆信息,有利于超前预警,保障煤炭资源安全高效开采。

    Abstract:

    In order to study the prevention and control of power disaster induced by coal mining process, Brazilian splitting test of raw coal specimen was carried out to study the energy evolution law in the process of coal body tensile damage destruction, and the precursor information of coal body destabilization and destruction was identified. The results show that: the coal body tensile damage process has significant nonlinear evolution characteristics, and it is possible to identify the critical point, destabilization point, and damage point of coal body damage; the energy evolution characteristics of coal body tensile damage in each stage are significantly different; in the elastic deformation stage, the input energy is mainly converted into elastic energy, and the dissipation energy remains stable, while in the destabilization stage, the dissipation-elasticity ratio shows a jumping growth; by calculating the ratio of the energy release rate to the energy By calculating the energy release rate and energy dissipation rate, it is found that the index has abnormal response characteristics at the critical point, destabilization point and damage point of the coal body tensile process, and the appearance of the characteristic points all have significant precursor information. The nature of coal destabilization is the result of energy accumulation and dissipation, and the energy index of coal body can reveal the abnormal characteristics of energy evolution in the process of damage and destruction of the specimen, and identify the precursor information of coal body catastrophe, which is conducive to the over-warning, and escort for the safe mining of coal.

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徐世龙,孙文洋,刘君奇,等. 煤体受拉破坏演化规律与失稳灾变特征研究[1][J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-27
  • 最后修改日期:2024-06-03
  • 录用日期:2024-06-08
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