煤岩受载损伤演化电位特征实验研究

发布时间：2018-05-02 11:24

本文选题：煤岩受载 + 电位响应　；参考：《煤炭学报》2017年S1期

【摘要】：通过分析煤岩破坏过程电位响应特征,并根据电位与变形破坏之间的关系,建立了煤岩损伤破坏与电位信号的耦合关系。研究表明:煤岩在受载破坏过程中电位信号与破裂损伤有较好对应关系。在受载前期,煤岩损伤变形较少,微破裂发育较为缓慢,产生的电位信号较少,较为稳定。受载后期,煤岩损伤破坏不断加剧,电位信号不断增加。当载荷突变时,煤岩破坏显著,电位信号出现相应的突变。试样破裂越强烈,电位突变越显著。基于统计损伤理论,建立了煤岩损伤破坏与电位信号的耦合关系,推导出不同损伤阶段基于电位累积量的"应力-应变"的理论曲线,并对计算应力与实测应力进行相关性分析,得到平均相关系数为0.623 7,呈显著相关,与实测值具有很好的对应性,且理论值具有前兆规律。电位响应特征的变化能够反映煤岩损伤的演化过程,为煤岩失稳破坏提供一种探测方法。
[Abstract]:Based on the analysis of the characteristics of potential response in the process of coal and rock failure and the relationship between potential and deformation, the coupling relationship between the damage and failure of coal and rock and the potential signal is established. The results show that the potential signal has a good relationship with the rupture damage during the failure of coal and rock under loading. In the early stage of loading, the damage deformation of coal and rock is less, the development of microfracture is slow, and the potential signal is less and more stable. In the late period of loading, the damage of coal and rock is aggravated and the potential signal is increased. When the load changes, the coal and rock damage is obvious, and the potential signal changes. The stronger the fracture of the sample, the more obvious the potential mutation. Based on the statistical damage theory, the coupling relationship between coal damage and potential signal is established, and the stress-strain curves based on potential accumulation in different damage stages are derived. The correlation analysis between calculated stress and measured stress shows that the average correlation coefficient is 0.623, which has a good correspondence with the measured value, and the theoretical value has the precursory law. The change of potential response characteristics can reflect the evolution process of coal and rock damage and provide a detection method for coal rock instability failure.
【作者单位】：中国矿业大学安全工程学院;中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;中国矿业大学煤炭资源与安全开采国家重点实验室;
【基金】：国家重点研发计划资助项目(2016YFC0801404) 国家自然科学基金资助项目(51674254) 中国矿业大学煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM15X03)
【分类号】：TD311

【相似文献】