受载复合煤岩变形破裂多场耦合模型研究
发布时间：2018-11-27 06:51
【摘要】：煤岩动力灾害是煤岩体在外界应力作用下在短时间内发生的一种具有动力效应和灾害后果的现象,是一种极其复杂的动力现象。煤岩变形破裂过程中产生的电磁、红外辐射可有效快捷预测冲击地压、煤与瓦斯突出等动力灾害,实现非接触式连续动态预测。主要研究成果如下:本文为了进行复合煤岩体变形破裂多物理场耦合模型的研究。自主研发了电磁辐射采集系统并制定了满足项目要求的试验方案。对电磁辐射强度信号、电磁辐射脉冲数信号与应力的变化规律进行深入分析,分析发现三者具有较高的耦合性。进行了电磁辐射强度与电磁辐射脉冲数、电磁辐射强度与应力的相关性研究,结果表明拟合度较高,前者的线性相关系数可达到0.9以上,后者的线性相关系数可达到0.8以上。对复合煤岩红外辐射温度与应力变化规律进行对比分析,发现同样具有一致性。对煤表面红外辐射温度与应力应变、顶板岩表面红外辐射温度与应力应变分别作了相关性研究,结果表明拟合度较高,线性相关系数均可达到0.9以上。在复合损伤因子的基础上,建立受载复合煤岩破裂力电热耦合模型并验证模型。结果表明考虑热损伤后,模型精确度得到提高。采用ANSYS有限元软件进行了力电耦合场、力热耦合场的仿真研究。其中力电耦合场的仿真研究,压电效应表明受载复合煤岩压密阶段没有压电效应贡献,弹性阶段和弹塑性阶段的压电效应表明压力与感应电荷的产生成线性关系;磁场分布仿真表明模型表面处的磁场强度最强,磁场强度与感应电荷的变化成正比。理想均匀分布的磁场没有方向性;力热耦合场的仿真研究表明,摩擦生热效应反应了裂隙处的摩擦生热变化规律,温度的变化与应力的变化成正相关关系,总结以上仿真结果均符合实验结论。论文研究成果对于进一步深入揭示煤与瓦斯突出等动力灾害演化机理,完善煤与瓦斯等煤岩动力灾害预测方法及保障煤矿安全生产具有重要的理论意义和实际应用价值。
[Abstract]:The dynamic disaster of coal and rock is a kind of phenomenon with dynamic effect and disaster consequence which occurs in a short time under the action of external stress. It is a kind of extremely complex dynamic phenomenon. The electromagnetic and infrared radiation generated in the process of coal and rock deformation and rupture can effectively and quickly predict the dynamic disasters such as rock burst, coal and gas outburst, and realize the non-contact continuous dynamic prediction. The main research results are as follows: in order to study the multi-physical field coupling model of composite coal and rock mass deformation and fracture. The electromagnetic radiation acquisition system has been developed independently and the test scheme to meet the requirements of the project has been established. The variation law of electromagnetic radiation intensity signal, electromagnetic radiation pulse number signal and stress are deeply analyzed, and it is found that the three have high coupling. The correlation between the intensity of electromagnetic radiation and the number of pulses of electromagnetic radiation, the intensity of electromagnetic radiation and the stress is studied. The results show that the linear correlation coefficient of the former is more than 0.9. The linear correlation coefficient of the latter is more than 0.8. The variation of infrared radiation temperature and stress of composite coal and rock are compared and analyzed. The correlation between infrared radiation temperature and stress strain on coal surface and infrared radiation temperature on top slate surface and stress strain are studied respectively. The results show that the fitting degree is high and the linear correlation coefficient is above 0.9. On the basis of the composite damage factor, an electrothermal coupling model of the fracture force of loaded composite coal and rock is established and verified. The results show that the accuracy of the model is improved after heat damage is taken into account. The ANSYS finite element software is used to simulate the coupling field of force and electricity and the coupling field of force and heat. The simulation of the coupling field shows that there is no contribution to the piezoelectric effect in the compaction stage of the loaded composite coal and rock, and the piezoelectric effect in the elastic and elastic-plastic stages shows that the pressure is linearly related to the generation of the induced charge. The simulation of magnetic field distribution shows that the intensity of magnetic field on the surface of the model is the strongest, and the intensity of magnetic field is proportional to the change of inductive charge. The ideal uniform distribution of magnetic field has no directionality. The simulation results show that the friction heat generation effect reflects the law of friction heat generation in fracture, and the change of temperature has a positive correlation with the change of stress. The above simulation results are in accord with the experimental results. The research results of this paper have important theoretical significance and practical application value for further revealing the evolution mechanism of coal and gas outburst dynamic disasters, perfecting the prediction method of coal and gas dynamic disasters and ensuring the safety of coal mine production.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD315
本文编号：2359755
[Abstract]:The dynamic disaster of coal and rock is a kind of phenomenon with dynamic effect and disaster consequence which occurs in a short time under the action of external stress. It is a kind of extremely complex dynamic phenomenon. The electromagnetic and infrared radiation generated in the process of coal and rock deformation and rupture can effectively and quickly predict the dynamic disasters such as rock burst, coal and gas outburst, and realize the non-contact continuous dynamic prediction. The main research results are as follows: in order to study the multi-physical field coupling model of composite coal and rock mass deformation and fracture. The electromagnetic radiation acquisition system has been developed independently and the test scheme to meet the requirements of the project has been established. The variation law of electromagnetic radiation intensity signal, electromagnetic radiation pulse number signal and stress are deeply analyzed, and it is found that the three have high coupling. The correlation between the intensity of electromagnetic radiation and the number of pulses of electromagnetic radiation, the intensity of electromagnetic radiation and the stress is studied. The results show that the linear correlation coefficient of the former is more than 0.9. The linear correlation coefficient of the latter is more than 0.8. The variation of infrared radiation temperature and stress of composite coal and rock are compared and analyzed. The correlation between infrared radiation temperature and stress strain on coal surface and infrared radiation temperature on top slate surface and stress strain are studied respectively. The results show that the fitting degree is high and the linear correlation coefficient is above 0.9. On the basis of the composite damage factor, an electrothermal coupling model of the fracture force of loaded composite coal and rock is established and verified. The results show that the accuracy of the model is improved after heat damage is taken into account. The ANSYS finite element software is used to simulate the coupling field of force and electricity and the coupling field of force and heat. The simulation of the coupling field shows that there is no contribution to the piezoelectric effect in the compaction stage of the loaded composite coal and rock, and the piezoelectric effect in the elastic and elastic-plastic stages shows that the pressure is linearly related to the generation of the induced charge. The simulation of magnetic field distribution shows that the intensity of magnetic field on the surface of the model is the strongest, and the intensity of magnetic field is proportional to the change of inductive charge. The ideal uniform distribution of magnetic field has no directionality. The simulation results show that the friction heat generation effect reflects the law of friction heat generation in fracture, and the change of temperature has a positive correlation with the change of stress. The above simulation results are in accord with the experimental results. The research results of this paper have important theoretical significance and practical application value for further revealing the evolution mechanism of coal and gas outburst dynamic disasters, perfecting the prediction method of coal and gas dynamic disasters and ensuring the safety of coal mine production.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD315
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