Vol. 45 No. 4 Aug,2018
矿业安全与环保
MINING SAFETY & ENVIRONMENTAL PROTECTION
杨慧明，张明明.煤体力学性质对其破坏过程声发射特征的影响研究[J].矿业安全与环保,2018,45(4);6-11. 文章编号：10084495(2018)04000605
第45卷第4期 2018年8月
煤体力学性质对其破坏过程声发射特征的影响研究
杨慧明12，张明明",2
(1.瓦新灾害监控与应急技术国家重点实验室，重庆400037；2.中煤科工集团重庆研究院有限公司，重庆400037) 摘要：采用试验研究的方法，对具有不同力学性质的突出软煤、强冲击性煤和弱冲击性煤在受载破
坏过程中的声发射事件频度、能量等时序特征参数及分形特征进行研究，探索煤体力学性质对其声发射特征的影响。研究结果表明，煤体的声发射特征参数变化与其破坏阶段相对应，煤体的力学性质对受载煤体的声发射时序特征具有重要影响。在峰后变形阶段，突出软煤的声发射呈现渐进下降的趋势，强冲击性煤的声发射呈现短暂的脉冲式增大，剪冲击性煤的声发射呈现“脉冲一降低”交替下降模式。不同力学性质的煤体破裂过程的声发射分形维的演化过程具有一致性，分形维演化都表现为“先上升、后下降”的过程，反映了煤体受载破坏是一个从弥散、无序的损伤破裂逐步向局部、有序的裂纹扩展过程。利用声发射时序特征与分形维变化相结合的综合前兆信息，可提高煤体失稳灾害判识模型的有效性和准确性。
关键词：煤体；声发射；力学性质；裂隙分布；时序特征；分形；煤与瓦斯突出预测
中图分类号：TD713
文献标志码：A
Effect of Mechanical Property on Acoustic Emission Activity of Coal
duringFailureProcess
YANG Huiming-2,ZHANG Mingming".2
( I. Stale Key Laboralory of rhe Gas Disaster Derecring , Presenting and Emergency Gontrolling, Chonging 400037, China;
2. CCTEG Chongqing Research Institute, Chongging 400037, China)
Abstract : Based on the method of experimental study , for soft coal with outburst liability, strong impact coal and weak impact coal that has different mechanical properties, the fractal characteristics and timeseries paramelers including acoustic emission ( AE) activity frequency and energy in the course of loading damage were studied, the influence of coal mechanical property on AE activity was also discussed. The results showed that the variation of AE characteristic paramelers is related to the damage phase of coal specimen, and the mechanical property of coal has an important influence on timeseries evolution of AE
of coal, AE activity of soft coal with outburst liability shows a gradual
activity. During the post peak deformation phase
downward trend, strong impact coal demonstrates
and weak impact coal shows a "pulsedecrease"
altermating declining patem. The AE fractal evolution of coals with diferent mechanical properties during failure process has the same variation trend that ~first rise, then fall". It reflects that the failure process of coal is a crack propagation activity process from dispersed and disorderly cracking to localized and ordered fracture, The comprehensive precursory infomation that combined with AE timeseries and fractal dimension change can improve the validity and aceuracy of the identification model for coal instability disaster.
Keywords: coal; acoustic emission; mechanical property; fissure distribution; timeseries characteristic; fractal; coal and gas outburst prediction
收稿日期：201709-15；20180326修订
基金项目：国家自然科学基金项目（51604298）；国家重点研发计划项目（2017YFC0804206）
作者简介：杨慧明（1981一），男，山西长治人，博士，副研究员，主要从事煤岩动力灾害防治方面的研究工作。 Email:yhm3380@163.com。
·6· 万方数据
随着煤矿开采深度的增加，煤岩地应力显著增大，地应力在煤与瓦斯突出（简称“突出")灾害中的致灾作用日益凸显，“低瓦斯指标”情况下发生突出灾害的情况屡有发生。日趋增多的深部应力主导型突出灾害，已逐步成为制约深部矿井安全高效生产