软煤与硬煤加载过程中声发射差异性及峭度特征
Kurtosis Characteristics and Acoustic Emission Difference of Soft Coal and Hard Coal Samples in Loading Process
-
摘要: 探究软煤与硬煤声发射特征的差异性，对于准确进行地质灾害预测具有重要意义。在不同矿区有针对性的采集煤样以后，利用RMT-150B型岩石力学实验系统以及CDAE-1全数字化声发射监测与分析系统，对煤样加载过程中的应力-应变、声发射特征进行测试与分析，对其峭度特征进行了评价。测试结果显示：在声发射特征方面，软煤与硬煤相比，其连续性声发射产生时间较早，声发射值较小，并且声发射峰值的突变性不明显；在峭度特征方面，软煤的声发射峭度值整体较大。并且在峰值破坏前，声发射峭度值存在1个相对稳定期的特征可以作为煤样破坏的前兆，可以为地质灾害的监测、预测提供指导。Abstract: To explore the acoustic emission difference of soft coal and hard coal is important for the accurate prediction of geological hazards. The stress-strain and acoustic emission characteristics of coal samples collected from different mining areas in loading process were tested and analyzed by using RMT-150B rock mechanics test system and CDAE-1 all-digital acoustic emission detection and analysis system, and its kurtosis features were evaluated. The result shows that the continuous acoustic emission generated in soft coal is earlier than that in hard coal, with a smaller acoustic emission value and an unconspicuous mutational acoustic emission peak. Besides, the kurtosis value of soft coal is larger than that of hard coal on the whole. And the characteristic that acoustic emission kurtosis has a relatively stable period before peak failure not only can be used as a precursory of coal destruction, but also can provide guidance for the monitoring and prediction of geological hazard.
-
Keywords:
- rock mechanics /
- soft coal /
- hard coal /
- acoustic emission /
- kurtosis characteristics /
- hardness /
- geological disaster prediction /
- difference
-
-
[1] 韩同春,张杰.考虑含缺陷岩石的声发射数值模拟研究[J].岩石力学与工程学报，2014,33(S1):3198. [2] 左建平，裴建良，刘建锋，等.煤岩体破裂过程中声发射行为及时空演化机制[J].岩石力学与工程学报，2011,30(8):1564-1570. [3] 苏承东,高保彬,南华,等.不同应力路径下煤样变形破坏过程声发射特征的试验研究[J].岩石力学与工程学报，2009,28(4):757-766. [4] 许江,唐晓军,李树春,等.周期性循环载荷作用下岩石声发射规律试验研究[J].岩土力学，2009,30(5):1241-1246. [5] 邱兆云,潘一山,罗浩,等.有效围压对煤体破裂声发射信号影响研究[J].中国安全生产科学技术，2015,11(4):47-53. [6] 刘保县,黄敬林,王泽云,等.单轴压缩煤岩损伤演化及声发射特性研究[J].岩石力学与工程学报，2009,28(S1):3234-3238. [7] 吕玉凯,姜耀东,宋义敏,等.单轴加载下煤样失稳破坏的多参量前兆特征[J].中国矿业大学学报，2014,43(5):815-822. [8] 聂百胜,何学秋,王恩元,等.煤体剪切破坏过程电磁辐射与声发射研究[J].中国矿业大学学报，2002,31(6):65-67.
计量
- 文章访问数: 386
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
