单轴压缩煤岩变形破裂电磁辐射与应力耦合规律的研究
摘要
利用实验研究、理论分析和数值模拟相结合的方法,研究了单轴压缩条件下煤岩变形破裂过程中产生的电磁辐射(EME)强度与煤岩内部应力之间的耦合规律。在煤岩材料损伤特性和强度统计理论的基础上,研究了受载煤岩变形破裂的三维力-电耦合本构关系,从理论上分析了煤岩变形破裂过程中电磁辐射强度和脉冲数与加载应力之间的关系,认为它们之间的关系可以用多项式来表征。煤岩变形破裂过程中的力-电耦合计算结果表明:EME先是逐渐增加,达到一个峰值后快速降低,这与实验测定结果的趋势是一致的;加载速度越大,EME 信号也越强;随着煤岩样品强度的增加,EME 也是逐渐增大的,其中强度最高的砂岩产生的 EME 强度也最大,以下依次是泥岩、硬煤和中硬煤。这些都说明采用的模型和计算方法是合理的,可以有效地模拟煤岩单轴压缩过程电磁辐射信号的变化规律。
Based on the laboratory experiment,theoretical analysis and numerical simulation,the coupling laws between electromagnetic emission (EME) intensity and stress fields during the deformation and fracture of coal and rock in uniaxial compression are researched in this paper. On the basis of damage characteristics and statistical strength theory of the brittle material like coal and rock,the three dimensional coupling relationship between EME intensity and stress is researched. The relations among the EME intensity,pulse numbers and stress are analyzed theoretically. The theoretical analysis shows that the coupling relationship can be expressed by multinomial approximately. The testing results show that the EME signal increases with stress approximately with the relation of cubic multinomial,the signal of EME emitted in the course of deformation and fracture of coal or rock in compression is relevant to the stress basically,and the intensity and pulse of EME increase with the stress, deformation and fracture. The results of coupling calculation show that the EME signal first increases to a summit value,then decreases suddenly,and it increases also with loading rate and strength of coal and rock,which is consistent with the experimental results.
Based on the laboratory experiment,theoretical analysis and numerical simulation,the coupling laws between electromagnetic emission (EME) intensity and stress fields during the deformation and fracture of coal and rock in uniaxial compression are researched in this paper. On the basis of damage characteristics and statistical strength theory of the brittle material like coal and rock,the three dimensional coupling relationship between EME intensity and stress is researched. The relations among the EME intensity,pulse numbers and stress are analyzed theoretically. The theoretical analysis shows that the coupling relationship can be expressed by multinomial approximately. The testing results show that the EME signal increases with stress approximately with the relation of cubic multinomial,the signal of EME emitted in the course of deformation and fracture of coal or rock in compression is relevant to the stress basically,and the intensity and pulse of EME increase with the stress, deformation and fracture. The results of coupling calculation show that the EME signal first increases to a summit value,then decreases suddenly,and it increases also with loading rate and strength of coal and rock,which is consistent with the experimental results.
引文
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18王维纲.高等岩石力学理论[M].北京:冶金工业出版社,1996
19唐春安.岩石破裂过程中的突变[M].北京:煤炭工业出版社,1993
2陈忠辉,谭国焕,杨文柱等.不同围压作用下岩石损伤破坏的数值模拟[J].岩土工程学报,2001,23(5):577～580
3纪洪广,张天森,蔡美峰等.混凝土材料损伤的声发射动态检测试验研究[J].岩石力学与工程学报,2000,19(2):165～168
4唐春安.脆性材料破坏过程分析的数值试验方法[J].力学与实践,1999,21(2):21～24
5纪洪广,乔兰,张树学等.深部岩体稳定性评价的声发射-压力 耦合模式[J].中国矿业,2001,10(2):51～54
6纪洪广,贾立宏.混凝土损伤的声发射模式研究[J].声学学报,1996,21(增4):601～608
7靳钟铭,弓培林,靳文学.煤体压裂特性研究[J].岩石力学与工程学报,2002,21(1):70～72
8刘善军,吴立新,吴焕萍等.多暗色矿物类岩石单轴加载过程中红外线辐射定量研究[J].岩石力学与工程学报,2002,21(11):1585～1589
9朱万成,唐春安,杨天鸿等.岩石破裂过程分析(RFPA2D)系统的细观单元本构关系及验证[J].岩石力学与工程学报,2003,22(1):24～29
10纪洪广,蔡美峰.混凝土材料声发射与应力-应变参量耦合关系及应用[J].岩石力学与工程学报,2003,22(2):227～231
11钱书清,郝锦绮,邓明德等.混凝土样品受压破裂过程中的电磁信号[J].岩石力学与工程学报,2001,20(6):797～800
12刘明举,何学秋.突出煤的电磁响应特征研究[J].辽宁工程技术大学学报,2000,19(5):470～473
13王恩元,何学秋.煤岩变形破裂电磁辐射的实验研究[J].地球物理学报,2000,43(1):131～137
14窦林名,何学秋,王恩元等.由煤岩变形冲击破坏所产生的电磁辐射[J].清华大学学报,2001,41(12):86～88
15WangEnyuan,HeXueqiu,LiuZhentang.The fractal rule of electromagnetic emission(EME) during coal or rock deformation and fracture[A].In:Proceedings of the’98InternationalSymposium onSafetyScience andTechnology[C].Beijing:SciencePress,1998,356～361
16NieBaisheng,HeXueqiu,WangEnyuan, et al.Macro and micro-mechanism of effect of eme on cbm adsorption in coal[A].In:Proc. ofFirstMineEnvironment andVentilationSymposium[C].India:[s. n.],2000,121～128
17HeXueqiu,WangEnyuan,LiuZhentang.Experimental study on the electromagnetic radiation(EMR)during the fracture of coal or rock[A].In:Proceedings of the‘99InternationalSymposium onMiningScience andTechnology[C].Beijing:SciencePress,1999,133～136
18王维纲.高等岩石力学理论[M].北京:冶金工业出版社,1996
19唐春安.岩石破裂过程中的突变[M].北京:煤炭工业出版社,1993
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