基于加卸载响应比的煤样破坏前兆实验分析
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摘要
基于加卸载响应比理论,实验研究了煤样在加卸载过程中声发射与电磁辐射的响应比特征,得出如下结论:①在单轴加卸载过程中,声发射与电磁辐射的加卸载响应比能比较好地反映煤样的稳定状态,煤样状态稳定时加卸载响应比较低,反之升高。②加卸载响应比增加到峰值之后,煤样开始遵循自身的演化规律,在发生宏观破坏之前加卸载响应比有明显的"急剧增长-迅速回落"过程,可以通过这一特征来预测煤样的宏观破坏。③由于煤样的不均匀性,加卸载响应比峰值时间与发生宏观破坏时间不一致,在应用加卸载响应比方法进行灾变预测时,应充分考虑煤岩不均匀程度,根据具体情况确定特征时间的尺度。实验结果表明,通过声发射和电磁辐射加卸载响应比预测煤岩动力灾害具有一定的可行性。
The paper researched and analyzed response ratio characteristics of acoustic emission and electromagnetic radiation of coal sample in load-unload by experiment based on load-unload response ratio theory,and got conclusions: ① Load-unload response ratio of acoustic emission and electromagnetic radiation can well reflect stable state of coal samples in process of homotaxial load-unload,and load-unload response ratio is lower when coal sample status is stable,otherwise is higher.② The coal samples will begin to follow itself evolution rule after the load-unload response ratio increased to peak,and the load-unload response ratio has process 'sharp growth-quickly down' before the coal samples break,which can be used to predict macroscopic damage of the coal sample.③ Peak time and macroscopic damage time of the load-unload response ratio is inconsistent because of inhomogeneity of the coal sample,so when method of load-unload response ratio is used to predict disaster,uneven degree of coal and rock should be considered to determine characteristic time.The experiment results show that predicting coal or rock dynamic disasters has certain feasibility by load-unload response ratio of acoustic emission and electromagnetic radiation.
The paper researched and analyzed response ratio characteristics of acoustic emission and electromagnetic radiation of coal sample in load-unload by experiment based on load-unload response ratio theory,and got conclusions: ① Load-unload response ratio of acoustic emission and electromagnetic radiation can well reflect stable state of coal samples in process of homotaxial load-unload,and load-unload response ratio is lower when coal sample status is stable,otherwise is higher.② The coal samples will begin to follow itself evolution rule after the load-unload response ratio increased to peak,and the load-unload response ratio has process 'sharp growth-quickly down' before the coal samples break,which can be used to predict macroscopic damage of the coal sample.③ Peak time and macroscopic damage time of the load-unload response ratio is inconsistent because of inhomogeneity of the coal sample,so when method of load-unload response ratio is used to predict disaster,uneven degree of coal and rock should be considered to determine characteristic time.The experiment results show that predicting coal or rock dynamic disasters has certain feasibility by load-unload response ratio of acoustic emission and electromagnetic radiation.
引文
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[7]张晖辉,尹祥础,梁乃刚.中国大陆地区中强地震前加卸载响应比异常时间尺度的统计研究[J].中国地震,2005,21(4):486-495.
[8]张晖辉.非均匀脆性介质的灾变预测——加卸载响应比理论的研究与实践[D].北京:中国科学院研究生院,2006.
[9]张浪平,李志雄,尹祥础,等.介质非均匀性对加卸载响应比峰值异常特征时间影响的数值研究[J].工程力学,2011,28(9):44-50.
[2]何学秋,王恩元,聂百胜,等.煤岩流变电磁动力学[M].北京:科学技术出版社,2003.
[3]国家地震局科技监测司.震前电磁波观测与实验研究文集[M].北京:地震出版社,1989.
[4]尹祥础,张浪平,张晖辉,等.加卸载响应20年及其展望[J].国际地震动态,2008,352(4):2-17.
[5]尹祥础,尹灿.非线性系统的失稳前兆与地震预报[J].中国科学(B辑),1991,21(5):512-518.
[6]王裕仓,尹祥础,王海涛.地震预测的加卸载响应比岩石实验模拟[J].中国地震,1998,14(2):126-130.
[7]张晖辉,尹祥础,梁乃刚.中国大陆地区中强地震前加卸载响应比异常时间尺度的统计研究[J].中国地震,2005,21(4):486-495.
[8]张晖辉.非均匀脆性介质的灾变预测——加卸载响应比理论的研究与实践[D].北京:中国科学院研究生院,2006.
[9]张浪平,李志雄,尹祥础,等.介质非均匀性对加卸载响应比峰值异常特征时间影响的数值研究[J].工程力学,2011,28(9):44-50.
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