受载复合煤岩变形破裂力电热耦合模型

Stress-electricity-thermal coupled model of composite coal-rock in deformation and fracture under load

采用自主研制的电磁辐射信号采集系统、高精度红外热成像仪分别采集由顶板岩、煤层、底板岩组成的复合煤岩受载破裂产生的电磁辐射、红外辐射温度信号。对复合煤岩的弹性模量与温度变化规律进行研究。结合热损伤、力电耦合模型,提出复合损伤因子,建立了受载复合煤岩破裂力电热耦合模型。对试样测试的数据进行拟合,分别采用力电耦合模型、力电热耦合模型对测试的试样模型参数m进行拟合。研究结果表明,复合煤岩的弹性模量和温度呈负相关关系,复相关系数在0.9以上。建立的新模型参数复相关系数比力电耦合模型有一定提高,结果表明考虑热损伤对模型修正后,模型精确度得到提高。

The electromagnetic emission（ EME） signal and the infrared radiation temperature signal from the deformation and fracture of composite coal-rock made up of roof rock,coal and floor rock have been collected by using a selfdeveloped EME signal acquisition system and a high precision infrared thermal imager. Also,the law of composite coalrock＇s elastic modulus and temperature in variation process were studied. Combined with the thermal damage and stress-electricity coupled model,the composite damage factor has been put forward. In addition,the study has established a stress-electricity-thermal coupled model of the loaded composite coal-rock. The experimental data has been fitted by means of tested composite coal-rock specimens. Model parameters m has been fitted by using the stress-electricity and stress-electricity-thermal coupled model of composite coal and rock specimens. The results show that the composite coal-rock＇s elastic modulus and temperature show a negative correlation relationship. The multiple correlation coefficient is above 0. 9. The multiple correlation coefficient of established model is higher than the stress-electricity coupled model. The model＇s accuracy has been improved by considering the thermal damage and revised model.