煤岩动力灾害中各个物理场演化非常复杂，结合损伤力学、电磁场理论等交叉学科理论，推导了复合煤岩变形破裂温度场、应力场、电磁场多物理场耦合数学模型，建立了多场仿真模型，对煤岩受载变形破坏过程中这三个物理场的变化规律进行数值模拟，并进行实验验证研究。

仿真结果表明:复合煤岩内部应力突变，微观角度而言，旧分子链断裂形成新的分子链，释放热量，同时，带电粒子在区域电场的作用下变速运动产生电磁辐射。宏观而言，煤体的抗压强度弱于岩体，煤岩体内出现裂隙，煤体应力、温度和电磁场能量明显高于岩体，在裂隙尖端应力和温度最大，磁场能量跟随仿真加载时长增加不断增强，磁感应强度沿逆时针旋转，由内向外不断衰减。

在相同条件下的实验结果表明:复合煤岩内部红外辐射温度随应力的增长呈现阶梯型上升趋势，在应力峰值附近温度达到最高。电磁辐射在加载初期缓慢增长，在应力峰值附近，电磁辐射突增至峰值，继续加载至煤岩破裂，电磁辐射急剧衰减直至消失。

实验与仿真结果一致，利用力电热耦合模型可以研究复杂条件下煤岩受载的特性，为深部煤岩开采动力灾害预测预报提供理论基础和新方法。

The evolution of various physical fields in coal-rock dynamic disasters is very complicated. Combined with the interdisciplinary theory of damage mechanics and electromagnetic field theory,the coupled mathematical model of multi-physics field,i. e. ,temperature field,stress field and electromagnetic field,of composite coal rock is deduced. By establishing a multi-field simulation model,the variation rules of the three physical fields are numerically analyzed in the process of loading deformation and failure of coal-rock samples and verified by experiments. The simulation results show that the internal stress of coal-rock changes from loading. At the microscopic point of view,the old molecular chain breaks to form a new molecular chain,which releases heat. Meanwhile,the variable-speed movement towards charged particles of the action of regional electric field produces electromagnetic radiation. Macroscopically,the com- pressive strength of coal is weaker than that of rock,and the stress,temperature and electromagnetic field energy of coal are obviously higher than those of rock. The stress and temperature at the tip of crack is the largest,and the mag- netic field energy increases with the increase of simulation time. The magnetic induction intensity rotates counterclock- wise and decays gradually from the inside to the outside. Under the same conditions,the experimental results show that the infrared radiation temperature shows a step-type growth following the growth of stress,and the temperature reaches the highest near the stress peak. In the initial stage of loading,the electromagnetic radiation ( EMR) slowly increases until the stress reaches a peak value,and the electromagnetic radiation suddenly increases to the maximum. After the coal-rock ruptures,the electromagnetic radiation attenuates sharply until it disappears. The experimental and simulation results are consistent. The coupling model of temperature field,stress field and electromagnetic field can be used to study the characteristics of coal and rock under complex conditions,which provides a theoretical basis and new method for dynamic disaster prediction to exploit deep coal-rock.